Bees produce honey as a long-term storage product for their own needs. But when this golden substance hits store shelves, it goes through a series of manufacturing processes that radically change its composition. These processes divide honey into two main types: filtered and unfiltered. The difference between them is not just a marketing ploy — it is a fundamental difference in processing technology that affects the chemical composition, beneficial properties, and even the legal status of the product on the international market.
Filtered honey undergoes ultrafiltration at a temperature of 70-80°C, which removes particles smaller than 0.1 microns, including all pollen. Unfiltered honey is only strained through a large mesh to remove wax particles and fragments of honeycomb, preserving pollen, propolis, and natural enzymes. This difference determines the shelf life, flavor profile, crystallization, and biological activity of the product.
How filtered honey is produced
Commercial production of filtered honey begins with heating. Honey is heated to a temperature of 70-78°C for 6-15 seconds — a process known as pasteurization. At this temperature, yeast and mold are destroyed, fermentation slows down, and the honey becomes liquid enough to pass through filters.
The next stage is ultrafiltration. The honey is forced through membranes with pores of 0.1-0.5 microns under a pressure of 3-5 bar. These pores are hundreds of times smaller than the diameter of a pollen grain, which is 15-100 microns. The result is a perfectly clear liquid without any suspended particles.
Pasteurization at 78°C for 6 minutes leads to an increase in the hydroxymethylfurfural (HMF) content by 4-20 mg/kg. This substance is formed during the thermal decomposition of fructose and serves as an indicator of heat damage to honey. European standards set an upper limit of 40 mg/kg for HMF in retail honey.
Heating honey above 40°C for a long time triggers a cascade of chemical reactions. At 40°C, the enzyme invertase takes 31 days to break down completely, but at 80°C, this process is reduced to 8.6 minutes. Pasteurization turns a living biological product into a stable sugar syrup.
Large manufacturers use flash heating—brief heating to 78°C for 15–20 seconds. This treatment destroys glucose crystals, delaying crystallization for 12+ months, which is critically important for large retailers who require a long shelf life.
How unfiltered honey is produced
Unfiltered honey undergoes minimal processing. After being extracted from the combs, it is filtered through a coarse nylon or steel mesh with 200-600 micron cells. This mesh traps only large particles: wax fragments, parts of bee bodies, and large pieces of comb. Pollen grains (15-100 microns), propolis, and small wax particles pass through the mesh and remain in the honey.
Some beekeepers maintain the temperature of the honey at 35-40°C — close to the temperature inside the hive — to reduce viscosity and speed up straining. At 40°C, the viscosity of honey drops from 10,000 to 2,000 centipoise, which makes it easier to work with without significantly damaging the enzymes.
The key advantage of this approach is the preservation of thermolabile compounds. The enzyme diastase, which hydrolyzes starch, remains fully active at temperatures below 40°C. Invertase, which breaks down sucrose into glucose and fructose, only begins to break down at 40°C. These enzymes do not directly affect human digestion, but serve as markers of the freshness and naturalness of honey.
Unfiltered honey contains 0.15-0.43% pollen by dry weight, according to a 2004 Australian government study. This seems like an insignificant amount, but pollen serves a critical function: it is the only way to trace the geographical origin of honey. Pollen analysis (the study of pollen) makes it possible to determine which plants and in which region the bees collected nectar.
What is the difference between filtered and unfiltered honey?
The most significant difference concerns enzymes. A study by the International Honey Commission showed that pasteurization reduces invertase activity by 98-100% and diastase activity by 15-25%. After heat treatment, diastase activity drops from 20-30 units on the Shad scale to 8-12 units, the lower threshold set by international standards.
| Characteristics | Filtered (pasteurized) | Unfiltered (raw) |
| Diastase activity | 3-12 units of Shada | 15-35 units of Shada |
| Contents of HMF | 7-20 mg/kg (after treatment) | 0-5 mg/kg (fresh) |
| Pollen | Completely absent | 0.15-0.43% dry weight |
| Propolis | Removed | Preserved |
| Antioxidant activity | Reduced by 15-30% | Complete |
| Antibacterial activity | Reduced by 20-40% | Maximum |
| Crystallization | After 12+ months | In 2-6 months |
The antioxidant activity of honey is associated with the presence of polyphenols, flavonoids, and phenolic acids. A study published in MDPI Foods (2024) demonstrated that pasteurization at 78°C for 6 minutes reduces the total polyphenol content by 12-18% and decreases antioxidant capacity by 15-30% when measured by the DPPH and FRAP methods.
Pollen in unfiltered honey is treated with bee saliva enzymes, which destroy the allergenic proteins present in airborne pollen. Therefore, bee pollen in honey rarely causes allergic reactions, unlike airborne pollen, which is carried by the wind and causes seasonal allergies.
Do not confuse pollen in honey with the pollen that causes hay fever. Bee pollen undergoes fermentation in the hive, where it is transformed into bee bread. This process converts allergenic proteins. People with seasonal allergies can usually safely consume unfiltered honey containing pollen.
Propolis, a resinous substance that bees collect from tree buds, has pronounced antibacterial and antifungal properties. Unfiltered honey contains microscopic particles of propolis, which enhance the preservative properties of the product. Filtration completely removes propolis along with pollen.
Which honey is healthier?
In 2012, the US National Honey Board conducted a comparative study of vitamins, minerals, and antioxidants in raw and processed honey. The results showed that the content of essential vitamins (B group, C) and minerals (potassium, magnesium, calcium) does not differ significantly between the two types. Honey is not a significant source of these nutrients at all — their concentration is too low.
The key differences are in the bioactive compounds:
Enzymatic activity. Invertase and diastase remain active in raw honey. Although these enzymes are not absorbed by the human digestive system, they serve as indicators of the absence of heat damage and indicate the preservation of other thermolabile compounds.
Antibacterial activity. Honey has natural antibacterial activity due to its low pH (3.2-4.5), low water content (less than 18%), and the presence of hydrogen peroxide, which is formed by the enzyme glucose oxidase. Heating inactivates glucose oxidase, reducing antibacterial activity by 20-40%.
Antioxidant capacity. Polyphenols and flavonoids are partially destroyed when heated. Paradoxically, some studies show a short-term increase in antioxidant activity immediately after heating due to the release of bound phenolic compounds. However, during subsequent storage, these compounds oxidize more quickly, and after 12 months, pasteurized honey exhibits significantly lower antioxidant activity compared to raw honey.
Hydroxymethylfurfural (HMF). This compound is formed during heating and prolonged storage of honey. Fresh honey contains 0-5 mg/kg of HMF. After pasteurization, the level increases to 7-25 mg/kg and continues to rise during storage. European standards set an upper limit of 40 mg/kg. HMF is considered potentially harmful at high concentrations, although levels in honey do not usually reach toxic levels.
Interesting facts about honey production
The modern honey industry uses HTST (High Temperature Short Time) technology, which involves brief heating at high temperatures. Honey is heated to 78°C for just 15-20 seconds, forcing it through a heat exchanger under pressure. This technology allows the desired result to be achieved with minimal damage: the increase in GMF is 2-5 mg/kg compared to 7-20 mg/kg with prolonged pasteurization.
An alternative technology is high-pressure processing (HPP). Honey is placed under a pressure of 400-600 MPa without heating. A 2024 study showed that HPP does not increase the GMP content or reduce enzymatic activity, while reducing the microbial load by 99% during 24 months of storage. The disadvantage of this method is the high cost of equipment, which limits its application.
Some manufacturers use ultraviolet radiation for sterilization instead of heating. UV treatment at a wavelength of 254 nm destroys yeast and mold spores without thermal damage. However, this method is only effective for a thin layer of honey (less than 5 mm) due to the low penetrating ability of UV rays through a viscous medium.
An important nuance concerns storage. Unfiltered honey, especially honey with a high glucose content (such as clover or lavender honey), crystallizes after 2-6 months at room temperature. Crystallization is a natural process that does not indicate spoilage. Glucose is unstable in solution and gradually precipitates, forming crystals. A thin layer of liquid with a high water content remains between the crystals. If the water content exceeds 18.6%, the natural yeast present in raw honey may begin to ferment. At room temperature (18-24°C), this is unlikely, but at temperatures above 25°C, the risk increases.
Crystallized raw honey is a sign of quality, not spoilage. If you notice small bubbles on the surface of crystallized honey, this is the beginning of fermentation. Store raw honey in the refrigerator at 4-10°C if you plan to keep it for more than 3-4 months. Cold temperatures slow down fermentation but do not stop crystallization completely.
Why is pollen removed when honey is filtered?
The commercial reasons for removing pollen go beyond aesthetics. Pollen is the only way to determine the geographical origin of honey. Palynologists can analyze pollen grains and determine which plants in which region the bees collected nectar from.
This capability creates a problem for unscrupulous importers who try to conceal the true origin of honey.
Between 2008 and 2013, the FDA uncovered a large-scale “honey laundering” scheme. Companies exported honey to India, Malaysia, Taiwan, and other countries, where it was ultra-filtered to completely remove the pollen, and then re-exported to the US under a different origin. Without pollen, it is impossible to determine the botanical and geographical origin of honey using laboratory methods. In 2013, several importers were convicted of importing more than $40 million worth of honey under the guise of products from other countries.
In 2002, the European Union imposed a total ban on honey imports from certain countries due to the detection of antibiotics. The US did not impose a ban, but created Import Alert 36-04, which automatically detains honey shipments from hundreds of importers until laboratory results confirm the absence of prohibited substances.
Ultrafiltration has become a tool for concealing origin. The FDA stated in 2018 that honey without pollen should not be called honey, but there is no official federal definition of “honey” in the US. This creates a gray area that unscrupulous operators take advantage of.
Legal producers of filtered honey remove pollen for other reasons. Pollen acts as a crystallization center: the more suspended particles there are, the faster the honey crystallizes. Large retailers require a shelf life of 12-18 months in a liquid state. Removing pollen, combined with heating to dissolve existing crystals, delays crystallization for this period.
Consumers often prefer visually clear honey. Studies show that cloudy honey with suspended particles is perceived as being of lower quality, even though these particles actually indicate minimal processing. USDA honey grading standards assign higher ratings to honey with good clarity.
How to distinguish filtered from unfiltered honey in a store
Visual inspection is the first step. Unfiltered honey is usually cloudy or has a milky hue due to suspended particles of pollen, propolis, and microscopic air bubbles. There may be a thin layer of sediment at the bottom of the jar — this is pollen that has gradually settled under the influence of gravity. Filtered honey is perfectly transparent, like light syrup.
However, appearances can be deceiving. Some types of honey, such as acacia honey, are naturally clear even without filtration due to their low pollen and mineral content. Other types, such as buckwheat or chestnut honey, are dark and opaque even after filtration.
The label provides more reliable information. Look for the terms “raw,” “unfiltered,” and “unpasteurized.” Important note: The term “raw” has no official federal definition in the US, so technically any manufacturer can use it. However, reputational risks keep large manufacturers from outright deception.
The term “organic” refers to beekeeping methods, not processing. Organic honey can be pasteurized and ultrafiltered. USDA Organic certification regulates that bees are not given antibiotics and that apiaries are located away from sources of pesticides, but does not prohibit heating or filtration.
| Term on the label | What does it mean? | What to pay attention to |
| Raw honey | It usually did not heat up above 40-45°C. | Not regulated by law, may be marketing |
| Unfiltered honey | Filtered, but not ultrafiltrated | Must contain pollen, check for cloudiness |
| Unpasteurized | Did not heat up to 70-80°C | Can be heated to 50-60°C for filling |
| Strained honey | Strain through a sieve | Similar to unfiltered, retains pollen |
| Filtered honey | Passed filtration | Can be conventional or ultrafiltration |
| Pure honey | Passed filtration | Does not mean no processing |
The country of origin provides indirect information. Honey from New Zealand (manuka), Greece (thyme), and France (lavender) is usually less processed, as these countries have strict quality standards and a lower proportion of industrial production. Honey of unknown origin or labeled “Product of multiple countries” is often a mixture of ultra-filtered honey from different sources.
Price can be an indicator, but not an absolute one. Raw, unfiltered honey is usually 20-50% more expensive than commercial filtered honey due to lower production volumes, faster crystallization (which reduces shelf life), and more complex logistics. However, some manufacturers inflate the prices of regular honey by adding the words “premium” or “artisan” to the label.
Buying directly from a beekeeper is the most reliable way to obtain unprocessed honey. Local farmers’ markets, apiaries with direct sales, and specialty stores usually offer minimally processed products. Beekeepers rarely have ultrafiltration equipment, so their honey is unfiltered by default.
Crystallization: a blessing or a problem?
All natural types of honey crystallize, but the speed of the process varies hundreds of times depending on the botanical origin. The key factor is the ratio of glucose to fructose. Glucose is much less soluble in water than fructose and easily crystallizes.
Clover honey (glucose:fructose ratio of about 1.1:1) crystallizes in 2-4 weeks. Acacia honey (ratio of 0.7:1) remains liquid for 1-2 years. Tupelo honey from Florida (ratio 0.5:1) may not crystallize for decades.
Filtered pasteurized honey crystallizes more slowly for two reasons. Heating dissolves all existing glucose microcrystals, which serve as crystallization centers. Removing pollen and other suspended particles also eliminates the centers around which new crystals form. The result is a delay in crystallization of 12-24 months.
Unfiltered honey crystallizes faster, but the quality of the crystals is often better. Pollen grains and wax microparticles serve as centers distributed evenly throughout the volume. Crystals form around multiple centers simultaneously, creating a fine-grained, smooth texture. Filtered honey, when it eventually crystallizes, often forms large, uneven crystals because there are fewer crystallization centers.
Some producers deliberately control crystallization to create “cream honey” or “whipped honey.” Fresh liquid honey is cooled to 14°C and stirred regularly for a week. Mechanical action breaks up the forming crystals, creating a mass of microscopic crystals 10-25 microns in size. The result is white, opaque honey with an oily texture that does not separate and is easy to spread.
Crystallized honey can be returned to a liquid state by heating. A safe method is to use a water bath at a temperature of 35-45°C. At this temperature, glucose crystals dissolve in 30-60 minutes without significant damage to enzymes. A microwave oven creates uneven heating with local hot spots above 100°C, destroying bioactive compounds.
Storage at temperatures below 10°C slows down crystallization, as cold temperatures increase the viscosity of honey to such an extent that glucose molecules find it difficult to diffuse and organize themselves into a crystal lattice. However, refrigeration does not prevent crystallization completely — it simply slows down the process by a factor of 5-10.
How to store filtered and unfiltered honey correctly
Honey is one of the few products with a virtually unlimited shelf life under the right conditions. Archaeologists have discovered 3,000-year-old honey in Egyptian tombs that was still fit for consumption. This is possible thanks to its unique physical and chemical properties: low moisture content (less than 18%), low pH (3.2-4.5), and the presence of natural preservatives, including hydrogen peroxide.
The main enemy of honey is moisture. Honey is hygroscopic and actively absorbs water from the air. If the water content exceeds 18.6%, conditions are created for the growth of osmophilic yeast. At 20% water, the yeast begins active fermentation, producing ethanol and carbon dioxide. Signs of fermentation include bubbles on the surface, foaming, and a sour smell and taste.
An airtight container is essential. Glass is the best material, as it does not react with honey and does not allow moisture to pass through. Food-grade plastic (HDPE, PP) is acceptable for short-term storage, but polymers are slightly permeable to water vapor. After one year of storage in plastic, the water content in honey may increase by 0.5-1%. Stainless steel containers are acceptable, but ordinary metals react with the acids in honey, causing corrosion and taste changes.
Storage temperature affects the rate of chemical processes. At room temperature (20-25°C), honey is stable for years. At temperatures above 25°C, the accumulation of GMF accelerates. Each 10°C increase in temperature doubles the rate of chemical reactions, including the formation of GMF. At 35°C, the GMF level increases by 3-5 mg/kg per year, and at 45°C, by 12-20 mg/kg per year.
Refrigeration (4-10°C) slows down all processes, including fermentation and the formation of GMF, but accelerates the crystallization of unfiltered honey. The freezer (-18°C) completely stops chemical changes, but after thawing, the texture may become uneven due to the formation of ice crystals in areas with high water content.
Light, especially direct sunlight, destroys enzymes and antioxidants. A study has shown that storing honey in the light at room temperature for 6 months reduces antioxidant activity by 25-35% compared to storage in the dark. A dark pantry or kitchen cupboard is the best place.
The expiration date on the label is usually 2-3 years, but this is a conservative estimate based on legal requirements. In fact, honey is safe to consume for decades when stored properly. The only exception is infant botulism: children under 12 months of age should not be given honey, as Clostridium botulinum spores can grow in an infant’s immature intestine.
The situation on the global honey market
Global honey production is around 1.9 million tons per year. China produces 450,000-500,000 tons (24-26% of global production), Turkey around 115,000 tons, Iran 85,000 tons, the US 70,000-80,000 tons, and Argentina 60,000-70,000 tons. The European Union produces a total of 250,000-280,000 tons but consumes around 600,000 tons, importing the difference.
The US consumes about 200,000 tons of honey annually, with its own production at 70,000-80,000 tons. The difference is covered by imports mainly from India (25-30%), Argentina (20-25%), Vietnam (15-20%), Brazil (10-15%), and Uruguay (5-10%). Chinese honey formally accounts for less than 5% of imports due to high tariffs, but the actual amount is likely higher due to re-exports through third countries.
Honey adulteration is a widespread problem. A 2011 study conducted by Food Safety News analyzed more than 60 honey samples from supermarkets. The results showed that 76% of the honey contained no pollen at all. All honey from pharmacies (100%), 77% from large retail chains, and 100% of honey in individual portion packs for catering did not contain pollen. Only 25% of honey from farmers’ markets and 71% of honey from specialty health food stores contained pollen.
The absence of pollen does not directly prove falsification, but it makes it impossible to verify the origin. This opens the door to diluting honey with corn syrup, cane syrup, invert sugar, and other cheap sweeteners.
In 2023, the European Commission conducted a large-scale study, testing 320 honey samples from different countries. The results were shocking: 46% of the samples were suspected of being adulterated. Detection methods included carbon isotope analysis, NMR spectroscopy, and marker enzyme identification.
Falsification detection technology is improving. Isotope analysis of stable carbon isotopes (δ13C) can detect the addition of syrups from plants with C4-type photosynthesis (corn, sugar cane). These plants have a different 13C/12C isotope ratio compared to C3-type plants from which bees collect nectar. The method does not work for syrups from C3-type plants (rice, wheat), requiring more complex methods such as NMR spectroscopy.
The actual cost of producing a kilogram of honey varies. In China, the cost is $1.5-2.5/kg due to industrial scale and low labor costs. In the US, the cost is $4-6/kg. In Europe, it is $5-8/kg. New Zealand manuka honey costs $15-30/kg at production due to the limited flowering season (4-6 weeks), the remoteness of apiaries, and high demand.
Retail prices are 2-4 times higher than wholesale prices. In the US, commercial filtered honey costs $6-10/kg, raw unfiltered local honey costs $12-20/kg, and special types such as manuka honey cost $40-100/kg. In Russia, the average price for filtered honey is 400-700 rubles/kg, and for unfiltered local honey, 800-1500 rubles/kg.
Honey regulation and quality standards
The international Codex Alimentarius standard established by the FAO/WHO defines honey as “a natural sweet product produced by bees from the nectar of plants or secretions from living parts of plants.” The standard prohibits the addition of any substances, including water, and requires minimal processing. However, the Codex standard is not enforceable — each country adopts its own laws.
The European Union has Directive 2014/63/EU, which defines honey and labeling requirements. The directive requires the country of origin to be indicated and prohibits the removal of components specific to honey, except where technologically necessary. The term “filtered honey” is permitted, but the removal of pollen must be justified.
The US does not have an official federal standard of identity for honey. The FDA issued guidance in 2018 stating that honey must comply with the Codex standard and that the removal of pollen through ultrafiltration is not permitted if done to conceal the origin. However, the guidance does not have the force of law.
The USDA has created a voluntary honey grading system based on color, clarity, absence of defects, and moisture content. The system assigns grades: Grade A (Fancy), Grade B (Choice), Grade C (Standard), Grade D (Substandard). Clear, filtered honey usually receives higher grades, which creates an economic incentive for filtration.
Russia uses GOST 19792-2017 “Natural Honey. Technical conditions.” The standard sets requirements for moisture content (no more than 20%), diastase activity (no less than 8 Shade units for light varieties), HMF content (no more than 25 mg/kg), and the absence of antibiotics and pesticides. The standard does not prohibit filtration or pasteurization, but requires that natural properties be preserved.
Which honey to choose: practical recommendations
The choice between filtered and unfiltered honey depends on the intended use and personal preferences.
Unfiltered raw honey is preferable for those who value the maximum content of bioactive compounds. It is worth choosing if you plan to use honey as a functional product to maintain health, rather than simply as a sweetener. The presence of pollen guarantees traceability of origin. Preserved enzymes and antioxidants provide maximum antibacterial and antioxidant activity. Disadvantages: higher price, rapid crystallization, the need to check the manufacturer’s reputation.
Filtered pasteurized honey is suitable for culinary purposes where stable texture and long shelf life are important. It remains liquid for 12+ months, which is convenient for regular use. When heated in cooking (baking, making sauces), the difference in bioactive compounds is leveled out, as the temperature destroys the remaining enzymes in unfiltered honey. Filtered honey is usually cheaper and more readily available in regular supermarkets.
A compromise option is unfiltered honey that has been lightly heated to 40-45°C. Such honey contains pollen and retains most of its enzymes, but flows better when bottled and crystallizes more slowly than completely raw honey. Many small beekeepers use this method.
When purchasing, consider several factors:
Origin. Purchasing local honey directly from a beekeeper minimizes the risk of adulteration and guarantees freshness. Local honey may also assist in adapting to local pollen, although scientific evidence for this effect is limited.
Label. Look for specific information: the name of the producer, the address of the apiary, the botanical origin (clover, linden, buckwheat), and the terms “raw,” “unfiltered,” and “unpasteurized.” Avoid vague terms such as “pure honey” without additional details.
Price. Suspiciously cheap honey (significantly below the average market price) is often counterfeit or heavily diluted. The price should reflect the actual cost of production.
Crystallization. Crystallized honey is a sign of naturalness. If honey has been liquid for more than two years, it is either acacia/tupelo (rare varieties that do not crystallize for years) or has undergone intensive processing.
Home tests provide limited information. The popular “water test” (natural honey supposedly does not dissolve in cold water) is a myth. Any honey dissolves in water, just at different rates depending on temperature and stirring. The “paper test” (natural honey is not absorbed into paper) is also unreliable and depends on the moisture content of the honey, not its naturalness.
The only reliable way to check quality is through laboratory analysis for pollen content, enzymatic activity, carbon isotope composition, and the presence of foreign sugars. Such an analysis costs $100-300 and is available in specialized laboratories.
Myths and reality about filtered and unfiltered honey
Myth: Filtered honey is fake. Reality: Filtering does not make honey fake if it is truly 100% honey with no additives. Filtering is a processing method that changes the composition but does not replace honey with another substance. The problem arises when ultrafiltration is used to conceal the origin of counterfeit or contraband honey.
Myth: Unfiltered honey is always healthier. Reality: The difference in health benefits depends on how the honey is used. When added to hot tea (70-80°C) or used in baking (150-180°C), enzymes are destroyed regardless of the original state of the honey. In such cases, the difference between filtered and unfiltered honey is minimal. The benefits of unfiltered honey are evident when consumed raw at room temperature.
Myth: Pollen in honey cures allergies. Reality: Scientific studies do not confirm the effectiveness of honey in treating seasonal allergies (hay fever). A randomized controlled study in 2002 found no difference between honey with pollen, honey without pollen, and a placebo in relieving allergy symptoms. The problem is that pollen in honey is collected by bees from flowers (entomophilous pollen), while allergies are caused by pollen carried by the wind (anemophilous) from other plants.
Myth: Honey never spoils. Reality: Honey with a water content below 18% can indeed be stored for thousands of years. But if the water content exceeds 18.6%, yeast can cause fermentation. Raw, unfiltered honey naturally contains yeast spores. If stored improperly (open jar in a damp room), honey can ferment within a few months.
Myth: Dark honey is healthier than light honey. Reality: Dark honey (buckwheat, chestnut, heather) does indeed contain more antioxidants and minerals than light honey (clover, acacia, linden). Studies show a 2-4 times difference in antioxidant activity. However, the absolute amounts of antioxidants in any honey are small compared to fruits and vegetables. Dark honey also has a more pronounced, often bitter taste that not everyone likes.
Myth: Crystallized honey is spoiled. Reality: Crystallization is a natural process that indicates the authenticity of honey. All natural types of honey crystallize, with the exception of acacia and tupelo honey. The crystals consist of pure glucose and are safe. Honey can be returned to a liquid state by gently heating it in a water bath at 35-40°C.
The Future of Honey Processing Technology
The honey industry is moving in two opposite directions. On the one hand, there is growing demand for minimally processed raw honey, especially among health-conscious consumers. The raw honey market in the US grew by 8-12% annually between 2018 and 2023, significantly outpacing the growth of the conventional honey market (2-3% per year).
On the other hand, large producers are investing in technologies that extend shelf life without visible damage to quality. High-pressure processing (HPP), used primarily for juices and meat products, is beginning to be applied to honey. Treatment at a pressure of 600 MPa for 5 minutes destroys yeast without heating, preserving enzymes and preventing fermentation. The disadvantage is the cost of the equipment, which is around $500,000-1,000,000, making it affordable only to large enterprises.
Pulsed electric field (PEF) is another technology that destroys microorganisms with short-term high-voltage pulses without heating. Studies show that PEF at 30 kV/cm for 200 microseconds inactivates yeast by 99.9% without changing enzymatic activity. The technology is still experimental and is not commercially available.
Ultrasonic treatment is used by some manufacturers to accelerate the liquefaction (thinning) of crystallized honey without intense heating. Ultrasound at a frequency of 20-40 kHz creates cavitation bubbles that destroy glucose crystals at a temperature of only 35-40°C. The method allows honey to be returned to a liquid state in 10-20 minutes instead of hours in a water bath.
Blockchain technologies are beginning to be used to track the origin of honey from the hive to the store. Several companies in New Zealand and Australia use QR codes linked to blockchain records containing information about the apiary, the date of extraction, and laboratory test results. This increases consumer confidence and makes it more difficult to falsify.
DNA barcoding is a method of identifying the botanical origin of honey based on the DNA of plants in pollen. The technology allows for the accurate identification of plant species even in ultra-filtered honey, provided that traces of DNA remain. Researchers at the University of Guelph have developed a DNA barcode database for more than 6,600 plant species used by bees.
Artificial intelligence is used to analyze spectral data (IR spectroscopy, Raman spectroscopy, NMR) to quickly detect adulteration. Machine learning algorithms trained on thousands of samples of natural and adulterated honey can identify the addition of foreign sugars with 95-98% accuracy in a few minutes without complex sample preparation.
Final thoughts
The difference between filtered and unfiltered honey reflects a fundamental conflict between commercial requirements (long shelf life, visual appeal, low cost) and preserving the natural properties of the product. There is no single “right” choice — the decision depends on what you value more: convenience and stability or maximum bioactive compound content.
Filtered honey functions as a sweetener just as effectively as unfiltered honey. Both types contain the same amount of carbohydrates, calories, and basic nutrients. The difference lies in the microcomponents: enzymes, antioxidants, and antibacterial compounds, which make up less than 1% of the honey’s mass but determine its biological activity.
The main problem with the modern market is not the processing technology itself, but the use of ultrafiltration to conceal the origin of counterfeit or contraband honey. This turns a legitimate processing technology into a tool for deception. The solution requires stricter regulation, mandatory testing of imported honey, and the creation of traceability systems that do not depend on the presence of pollen.
As a consumer, you can influence the market with your purchasing decisions. Buying local honey directly from beekeepers supports sustainable beekeeping and guarantees a minimally processed product. A willingness to pay a fair price for quality honey creates an economic incentive for producers to forego aggressive processing for the sake of extended shelf life.
Honey remains one of humanity’s oldest products, and its fundamental nature has not changed in millennia. Bees create honey according to the same biochemical laws as they did millions of years ago. The question is how much of this ancient biochemistry remains by the time the honey reaches your table.
FAQ
Yes, crystallized unfiltered honey can be safely liquefied in a water bath at a temperature of 35-40°C. At this temperature, glucose crystals dissolve in 30-60 minutes without significant destruction of enzymes. Avoid using a microwave oven, as it creates uneven heating with local temperatures above 100°C, which destroys bioactive compounds. Do not heat honey above 45°C if you want to preserve its beneficial properties.
Scientific studies do not confirm the effectiveness of honey in treating hay fever. A 2002 randomized controlled study found no difference between honey with pollen and a placebo in relieving allergy symptoms. The reason: the pollen in honey is entomophilous (collected by bees from flowers), while allergies are caused by anemophilous pollen (carried by the wind) from completely different plants. In addition, bee pollen is fermented in the hive, which changes the structure of allergenic proteins.
Both types of honey, when stored properly (in an airtight container, at room temperature, in a dark place), remain safe to consume for years and even decades. The key difference is in texture, not safety. Unfiltered honey crystallizes after 2-6 months, while filtered honey remains liquid for 12+ months. Crystallization does not mean spoilage — it is a natural process. The only risk for raw honey is fermentation if the water content exceeds 18.6% due to improper storage in an open container in a humid room.
Paradoxically, filtration requires additional equipment and energy costs. However, filtered honey is cheaper for two reasons: industrial scale production (which reduces unit costs) and a longer shelf life in liquid form, which simplifies logistics and reduces losses from crystallization. Large producers can afford expensive ultrafiltration equipment, which pays for itself through volume. Unfiltered honey is more often produced by small apiaries with lower volumes and higher relative costs.
Clarity does not always indicate filtration — some types of honey (acacia, tupelo) are naturally clear due to their low pollen and mineral content. The key indicator is the presence of cloudiness or sediment at the bottom of the jar. If the honey is perfectly clear like glass without any suspended particles, it has probably been ultrafiltrated. A reliable way is to check the label for the terms “raw,” “unfiltered,” “unpasteurized,” and specific information about the manufacturer. When in doubt, buy directly from beekeepers at farmers’ markets.
No. Children under 12 months of age should not be given any honey, whether filtered or unfiltered. Any honey may contain Clostridium botulinum spores, which are safe for adults and children over one year of age but can germinate in an infant’s immature gut, causing infant botulism. This is a rare but potentially dangerous condition. After 12 months, a child’s digestive system is developed enough to prevent the spores from germinating.
Yes, significantly. At a temperature of 70-80°C (the typical temperature of freshly brewed tea), the enzymes invertase and diastase are destroyed within a few minutes. Antioxidants partially degrade and antibacterial activity decreases. If you value the bioactive properties of unfiltered honey, add it to a warm (not hot) drink with a temperature below 40°C, or consume it separately. For hot tea, the difference between filtered and unfiltered honey is minimal — both work simply as sweeteners.
