Raw vs Processed Honey: What Happens When Honey Is Heated?

This is part of our Complete Guide to Raw Organic German Honey and our Honey for Wellness - A Natural Health Guide.

8 min read

Most people know that raw honey is "better" than processed honey. Far fewer know exactly why, or what the word "processed" actually means in practice. This article explains the science plainly: what happens inside a jar of honey when it is heated, which compounds are affected at which temperatures, and why the difference between raw and processed honey is not just a matter of food preference but of chemistry.

What does "processed" actually mean?

When honey leaves the hive, it is a complex biological substance. It contains water, sugars (primarily fructose and glucose), pollen grains, propolis traces, wax fragments, naturally occurring yeast cells, and a range of active enzymes and antioxidant compounds. It is also slightly variable in colour, texture, flavour, and moisture content because it reflects the specific flowers, season, and geography where it was produced.

This variability is a problem for large-scale commercial honey production. Retailers want honey that looks identical jar to jar, stays liquid on the shelf for two years, and flows easily through automated bottling equipment. To achieve all of this, commercial producers apply two processes: heat treatment (usually called pasteurisation) and fine filtration.

Pasteurisation involves heating honey to between 70°C and 80°C, sometimes briefly at even higher temperatures to kill the naturally occurring yeast cells that would otherwise cause fermentation. It also makes the honey more liquid and delays crystallisation.

Fine filtration forces the warm, liquid honey through extremely fine filters sometimes as fine as 0.2 microns to remove any remaining particles, including wax fragments, propolis traces, and crucially, pollen grains.

The result is a product that looks uniformly golden, stays liquid for years, and photographs beautifully. It also has a significantly different nutritional and biochemical profile from the honey that the bees made.

The temperature thresholds — what gets destroyed and when

This is the part most honey articles skip. The impact of heat on honey is not binary, it does not simply "destroy nutrients" or "preserve them." Different compounds are affected at different temperatures and over different time periods. Here is what the science shows.

Below 40°C — the safe zone

Below 40°C, honey can be warmed without meaningful loss to its active compounds. This is the temperature range Hexapi recommends for gently re-liquifying crystallised honey: place the jar in a bowl of warm (not hot) water, allow it to warm slowly, and stir gently. No significant enzyme degradation occurs at this range for short periods.

This matters practically: bees maintain their hives at approximately 35°C. Raw honey, by definition, has never been above the temperature of the hive environment it was produced in.

40°C to 60°C — early enzyme stress

This range is where things start to change. Invertase, one of the most important enzymes in honey, responsible for converting sucrose into glucose and fructose shows measurable degradation at temperatures as low as 35°C with prolonged exposure. At 40°C to 50°C sustained over hours, enzyme activity begins to decline, though the effects are modest in short exposures.

For home use: if you are adding honey to warm (not hot) tea, or using it in a sauce that is heated briefly to this range, the enzyme impact is limited. The concern is sustained exposure over long periods, not momentary warmth.

60°C to 78°C — the pasteurisation zone

This is the temperature range most commercial processors operate in, and this is where the significant damage occurs.

Diastase, the enzyme used internationally as a marker of honey quality and freshness begins declining noticeably in this range. A study by the International Honey Commission found that pasteurisation reduces invertase activity by 98 to 100% and diastase activity by 15 to 25%. In practical terms: after commercial pasteurisation, the invertase that gives raw honey part of its digestive benefit is almost entirely gone.

A 2024 study published in MDPI Foods found that pasteurisation at 78°C for six minutes reduces total polyphenol content by 12 to 18% and decreases antioxidant capacity by 15 to 30%. These are significant reductions, not trace losses.

Glucose oxidase, the enzyme that produces hydrogen peroxide in honey, giving it its antimicrobial properties begins degrading at even lower temperatures. Research shows that heating honey to just 55°C for 15 minutes can reduce glucose oxidase activity by approximately 30%.

80°C and above — rapid, extensive destruction

Above 80°C, enzyme destruction accelerates dramatically. When honey is heated to 71°C (a common pasteurisation temperature) diastase activity drops by 60% or more within 15 minutes. Above 80°C, significant enzyme destruction occurs within minutes.

At these temperatures, another compound also becomes relevant: hydroxymethylfurfural, or HMF. HMF is a chemical that forms when sugars are heated, and its presence in honey is used by food regulators as a marker of heat treatment and age. Fresh raw honey contains very low levels of HMF. Commercially processed honey contains significantly higher levels. European Union regulations set a maximum HMF threshold of 40mg per kilogram for standard honey and 80mg per kilogram for honey from tropical origins. High HMF levels are one of the ways regulators and laboratories can identify honey that has been heavily heated.

What about pollen — and why does its removal matter?

Filtration is the second part of commercial honey processing, and it has an impact that is separate from heat but equally significant: it removes pollen.

Pollen removal is primarily done for commercial reasons. Pollen grains can trigger crystallisation in stored honey, which is what retailers want to avoid. Ultra-fine filtration removes them entirely, resulting in a product that stays liquid for years.

But pollen removal has a consequence beyond crystallisation: it destroys traceability. Every honey variety has a botanical fingerprint, the specific pollen grains from the specific flowers that bees visited. Pollen analysis is the primary scientific tool used by laboratories to verify the origin of honey, the variety it claims to be, and the country it comes from.

When pollen is removed, that fingerprint disappears. This makes adulterated honey, i.e. honey blended with cheaper sugars or from undisclosed origins significantly harder to detect. Multiple investigations by food safety authorities in Europe, the US, and Hong Kong have found that honey sold as pure, single-origin product contains adulterants that could have been identified through pollen analysis if the pollen had not been removed.

At Hexapi, every jar of honey is pollen-complete. This means an independent laboratory can take any jar, analyse its pollen content, and verify that it came from the specific region of Germany and the specific botanical source stated on the label. Bioland certification, which all Hexapi beekeepers hold, requires this traceability as a condition of certification.

What raw honey actually contains — the full picture

Raw honey is not simply "unheated honey." It is a biologically complete substance. Here is what it contains that processed honey largely does not.

Active enzymes: Diastase, invertase, glucose oxidase, catalase, and amylase are the primary enzymes in raw honey. These are biological catalysts, proteins that facilitate chemical reactions in the body. In raw honey, they are present at naturally occurring levels. In pasteurised honey, most are substantially reduced or absent.

Bee pollen: Pollen grains carry their own nutritional and antioxidant properties and serve as the provenance fingerprint described above.

Propolis traces: Propolis is the resinous substance bees use to seal and protect the hive. It has documented antimicrobial properties and is present in trace amounts in unfiltered raw honey.

Flavonoids and phenolic acids: These are the primary antioxidant compounds in honey, the ones measured in the MDPI Foods study referenced above. Their levels vary by floral source (darker honeys like heather and linden honeydew tend to contain higher concentrations than lighter varieties like acacia), but all are present in raw honey at higher levels than in processed equivalents.

Naturally occurring yeast: Raw honey contains small amounts of naturally occurring, benign yeast cells. These are harmless in honey with a moisture content below 20% (which all properly harvested honey maintains) and contribute to the complex flavour of raw varieties.

Practical questions answered

Can I put raw honey in hot tea?

Yes, but with a trade-off. If the tea is at full boiling temperature (100°C), adding honey will destroy its enzymes rapidly. For the full benefit of raw honey, add it to tea that has cooled to below 40°C, or stir it into warm (not hot) water. If you are using honey primarily for flavour in hot drinks, the heat impact is less important it will still taste excellent. If you are using it for its active properties, cool the liquid first.

Does cooking with raw honey destroy its benefits?

For high-heat cooking like baking, roasting, glazing - yes, sustained high heat will degrade the enzyme content. This is a fine trade-off if you are using honey as a flavour ingredient. For lower-heat applications like drizzled on food after cooking, mixed into room-temperature dressings, added to warm (not hot) oatmeal the impact is minimal.

Is crystallised honey still raw?

Yes. Crystallisation is a physical process, not a chemical one. It does not affect enzymes, antioxidants, or any other nutritional compound. Raw honey crystallises naturally over time and is a sign of quality, not deterioration. Rapeseed honey crystallises within days of extraction; acacia honey remains liquid for much longer due to its high fructose content. Both are equally raw.

Does heating honey make it toxic?

No, this is a common misconception, particularly in Chinese-language health content. Heating honey does not produce toxic compounds. What it does is reduce or destroy the active compounds that give raw honey its properties beyond basic sweetness. Honey is safe to cook with. It simply becomes, nutritionally, closer to a basic sweetener once it has been significantly heated.

Why "organic" alone is not enough

This is the point most honey brands will not make clearly: a honey can be certified organic and still be heavily processed.

Organic certification governs how the bees are kept and what the land around the hives looks like. It does not govern what happens to the honey after extraction. A certified organic honey producer can heat their honey to 80°C, filter it to remove all pollen, and sell it in a jar that legitimately carries the EU organic leaf logo.

This is why Hexapi's Bioland certification matters specifically.

Bioland requires not only organic production standards but also that honey is handled with minimal processing and therefore preserving its raw character. The combination of EU Organic certification, Bioland certification, and annual auditing by DE-ÖKO-006 is what guarantees that what is in a Hexapi jar is genuinely what it claims to be: raw, organic, traceable German honey.

If a honey carries only an organic label with no raw designation, no named certifier, no pollen completeness — it may be produced to excellent environmental standards while still being pasteurised and filtered in the same way as the cheapest supermarket honey.

The practical summary

What to do with this information

When you buy honey, from Hexapi or anyone else, the questions to ask are:

• Has it been heated?
• Has the pollen been removed?
• Can the origin be verified?
• Is there an independent certification that covers the post-extraction handling, not just the farming practices?

A jar that answers all four questions satisfactorily is genuinely raw organic honey. A jar that answers only the last one may be organic in its production and highly processed in its handling.

Every jar of Hexapi honey answers all four.

This article is part of our Complete Guide to Raw Organic German Honey and our Honey for Wellness - A Natural Health Guide. 

Ready to try genuine raw organic German honey? Shop the full Hexapi Honey Variety.