Raw honey's main enzymes are diastase, invertase, and glucose oxidase, added by bees as they ripen nectar. Its antioxidants are mostly flavonoids and phenolic acids from the flowers. Heat degrades the enzymes (diastase is the standard lab marker for heat damage), and fine filtering removes pollen, which is why raw honey differs from pasteurized honey. A 2018 comprehensive review in Molecules identified enzymes, amino acids, vitamins, minerals, flavonoids, phenolic acids, and organic acids as major bioactive categories, many of which are absent or degraded in processed honey (Molecules, 2018). Understanding what these compounds do -- and what destroys them -- helps you make better choices at the honey jar.
We're family beekeepers in Northern California (since 1892), and the difference between raw and processed honey isn't abstract to us. Our honey is raw and unfiltered, never heated above 95°F. This guide breaks down the key enzymes, the major antioxidant groups, the exact temperature thresholds that destroy them, and how to preserve these compounds at home.
TL;DR: Raw honey contains three critical enzymes (diastase, invertase, glucose oxidase) and dozens of antioxidants (flavonoids, phenolic acids) that processed honey loses. Heat above 104 degrees F begins degrading enzymes. A Molecules (2018) review documented over 200 bioactive compounds in raw honey. Buy raw, store cool, and never add honey to boiling liquids.
What Are the Key Enzymes in Raw Honey?
Raw honey contains at least eight identified enzymes, but three do the heaviest lifting. The international Codex Alimentarius honey standard (FAO/WHO) uses diastase activity (measured in Schade units) as a primary indicator of honey freshness and quality -- honey generally must score at least 8 on the diastase scale after processing and blending (Codex Alimentarius/WHO, 2019).
Diastase (Amylase)
Diastase breaks down starch molecules into simpler sugars. In the hive, it helps convert nectar into honey. In your body, it supports carbohydrate digestion. Diastase is also the enzyme most commonly used to test whether honey has been heated, because its activity drops measurably with even moderate temperature exposure.
A diastase number (DN) below 8 indicates that honey has been overheated or stored improperly. High-quality raw honeys typically score between 15 and 40 DN. The number declines over time even at room temperature, which is why fresh raw honey is more enzymatically active than aged honey.
Invertase
Invertase converts sucrose into glucose and fructose -- the two simple sugars that make honey easier to digest than table sugar. Bees add invertase to nectar during the ripening process inside the hive. This enzyme remains active in raw honey, continuing to work in your digestive system when you eat it.
Invertase is even more heat-sensitive than diastase, so it drops quickly when honey is heated.
Glucose Oxidase
This is the enzyme that gives raw honey its antibacterial superpower. When honey is diluted -- by saliva, wound moisture, or water -- glucose oxidase converts glucose into gluconic acid and hydrogen peroxide. In lab studies, that low-level peroxide inhibits bacteria and fungi.
Glucose oxidase is a big part of why honey has been studied for wound dressings and why it's used to soothe sore throats. Heat reduces its activity, so heavily heated honey relies mostly on its sugar concentration and acidity for antimicrobial effect.
Other Enzymes Worth Knowing
- Catalase -- breaks down hydrogen peroxide after it's done its antimicrobial work, preventing tissue damage
- Acid phosphatase -- contributes to mineral bioavailability
- Proteases -- break down proteins, contributing to honey's digestive support
Citation Capsule: The Codex Alimentarius honey standard (FAO/WHO) sets a general minimum diastase activity of 8 Schade units, making diastase the standard lab indicator of heat damage and age in honey.
What Antioxidants Does Raw Honey Contain?
Raw honey carries a modest but real antioxidant load. A 2003 study in the Journal of Agricultural and Food Chemistry found that substituting honey for refined sugar in the diet increased blood antioxidant levels in healthy adults within two weeks (Journal of Agricultural and Food Chemistry, 2003). The antioxidants fall into two main categories: flavonoids and phenolic acids.
Flavonoids in Honey
Flavonoids are plant-derived compounds studied for antioxidant and anti-inflammatory activity, mostly in lab and animal research. The major flavonoids identified in raw honey include:
- Chrysin -- anti-inflammatory, shown to inhibit aromatase enzyme activity
- Quercetin -- antihistamine properties, supports cardiovascular health
- Kaempferol -- antioxidant and anti-inflammatory
- Pinocembrin -- unique to honey and propolis, neuroprotective in animal studies
- Galangin -- antimicrobial, particularly effective against gram-positive bacteria
Phenolic Acids
Phenolic acids are the other major antioxidant group. Key compounds include:
- Gallic acid -- strong free radical scavenger, anti-inflammatory
- Caffeic acid -- inhibits certain inflammatory pathways
- Ellagic acid -- documented antimutagenic properties
- p-Coumaric acid -- supports detoxification enzymes in the liver
- Ferulic acid -- photoprotective, stabilizes other antioxidants
How Floral Source Affects Antioxidant Levels
Not all honeys are created equal in the antioxidant department. A 2004 analysis in the Journal of Agricultural and Food Chemistry measured total antioxidant capacity across multiple varieties and found that dark buckwheat honey had far higher antioxidant activity than light clover honey (Journal of Agricultural and Food Chemistry, 2004). Color serves as a rough guide: darker honey means more antioxidants.
| Honey Variety | Color | Relative Antioxidant Level |
|---|---|---|
| Buckwheat | Very dark | Highest (reference) |
| Wildflower | Medium-dark amber | High |
| Manuka | Dark amber | High |
| Sage | Medium amber | Moderate-high |
| Orange blossom | Light amber | Moderate |
| Clover | Pale gold | Low |
| Acacia | Nearly clear | Very low |
Our wildflower honey shifts in color from batch to batch depending on what's blooming. Darker batches taste stronger and, based on the research above, likely carry more antioxidants than our lighter spring honey.
How Does Processing Destroy Enzymes and Antioxidants?
Temperature is the primary enemy, and time matters as much as heat. Enzyme loss is gradual at warm temperatures and fast at pasteurization temperatures; the thresholds below are approximate, since the rate depends on how long honey is held there.
Temperature Thresholds
| Temperature | What Happens |
|---|---|
| 95 degrees F (35 degrees C) | Safe zone -- normal hive temperature, no degradation |
| 104 degrees F (40 degrees C) | Enzyme degradation begins -- diastase starts declining |
| 118 degrees F (48 degrees C) | Significant enzyme loss -- glucose oxidase activity drops rapidly |
| 140 degrees F (60 degrees C) | Major enzyme destruction -- invertase and diastase severely reduced |
| 160 degrees F (71 degrees C) | Standard pasteurization -- most enzymes destroyed within minutes |
| 212 degrees F (100 degrees C) | Boiling -- essentially all enzymes and many antioxidants eliminated |
What Pasteurization Does
Commercial pasteurization heats honey to 145-160 degrees F for 30 minutes (or 161 degrees F for 15 seconds in flash pasteurization). This kills yeast cells that cause fermentation, delays crystallization, and creates the smooth, pourable texture consumers expect. But it comes at a steep cost.
Studies comparing honey before and after heating consistently find lower diastase and invertase activity and higher HMF, a sugar breakdown product. Antioxidant losses are generally smaller than enzyme losses and vary with the honey and the process.
Ultra-Filtration: The Other Problem
Even without heating, ultra-filtration removes pollen, propolis particles, and wax fragments -- all of which carry antioxidants and trace nutrients. The 2011 Food Safety News investigation found that most store-bought honey had been ultra-filtered, leaving a product that's essentially flavored sugar syrup from a nutritional standpoint.
Citation Capsule: Heating honey lowers diastase and invertase activity and raises HMF, which is why the Codex Alimentarius standard uses diastase and HMF as indicators of heat damage. Antioxidants are more heat-stable than enzymes.
The honey industry frames pasteurization as a "safety" measure, but honey's natural acidity (pH 3.2-4.5) and low water activity already prevent pathogenic bacterial growth. Pasteurization primarily prevents crystallization and fermentation -- cosmetic issues, not safety ones. The safety framing misleads consumers into thinking raw honey is risky, when the real risk is losing the compounds that make honey worth eating.
How Can You Preserve Enzymes and Antioxidants at Home?
Buying raw honey is step one -- and knowing how to tell if honey is truly raw helps you avoid counterfeits. Keeping it raw is step two. Enzyme activity declines slowly with age even at room temperature, and faster in a warm spot, so where you keep the jar matters.
Storage Best Practices
- Keep it at room temperature -- a pantry cupboard away from the stove works fine. Refrigeration isn't needed and speeds up crystallization.
- Avoid sunlight -- UV light degrades some antioxidant compounds over time. Dark glass jars or a closed cabinet protect honey.
- Use clean, dry utensils -- moisture introduces yeast that can cause fermentation.
- Don't microwave -- even brief microwave exposure creates hot spots that exceed safe enzyme temperatures.
What About Crystallization?
Crystallized honey hasn't lost its enzymes -- it's still raw. To decrystallize, place the jar in a warm water bath no hotter than 104 degrees F (40 degrees C). Stir occasionally. This process takes patience (30-60 minutes), but it preserves everything that matters. Never microwave or boil water to speed the process.
Cooking and Baking Considerations
If you're adding honey to hot drinks, let the liquid cool to "comfortably warm" before stirring in honey. A kitchen thermometer reading of 95-100 degrees F is ideal. For baking, accept that oven temperatures will destroy enzymes -- use a less expensive honey for baked goods (our baking with raw honey guide covers temperature adjustments) and save your raw honey for unheated applications.
How Do Labs Test Enzyme Activity in Honey?
If a honey claims to be raw, lab testing can verify it. The International Honey Commission (IHC) and the Association of Official Analytical Chemists (AOAC) publish standardized methods. Understanding these tests helps you evaluate quality claims.
Diastase Number (DN) -- Schade Method
The Schade method measures how quickly honey's diastase enzyme breaks down a starch solution. Results are expressed in Schade units. The Codex Alimentarius sets a general minimum DN of 8. Scores above 15 indicate excellent enzyme preservation.
Hydroxymethylfurfural (HMF) Testing
HMF is a compound that forms when sugars are heated. Fresh raw honey contains less than 10mg/kg of HMF. The Codex Alimentarius sets a maximum of 40mg/kg for quality honey. Levels above 80mg/kg indicate severe overheating or prolonged improper storage. HMF testing is the most reliable way to catch honey that's been heat-damaged.
Total Phenolic Content (TPC)
The Folin-Ciocalteu method measures total phenolic antioxidants and expresses results in milligrams of gallic acid equivalent (GAE) per kilogram. Raw wildflower honeys typically score 300-1,000 mg GAE/kg. Heating lowers this somewhat, though floral source matters more.
What to Look for on Labels
Some raw honey producers publish diastase number, HMF levels, or both. If neither appears on the label, that doesn't mean the honey is bad -- small-batch producers often can't afford routine lab testing. But if you're comparing premium products, these numbers tell you more than marketing language ever will.
Citation Capsule: The Codex Alimentarius international standard sets a general minimum diastase number of 8 and maximum HMF of 40 mg/kg (80 mg/kg for tropical honeys) (Codex/WHO, 2019). HMF testing is the most reliable indicator of heat damage, with fresh raw honey containing less than 10mg/kg.
How Do Raw and Processed Honey Compare Side by Side?
The differences are measurable. Below is a general comparison based on the Codex Alimentarius quality criteria and published research on heated honey; exact values vary by floral source, age, and how hot and how long the honey was heated.
Raw vs. Processed Enzyme and Antioxidant Comparison
| Compound/Metric | Raw Honey | Heated/Processed Honey |
|---|---|---|
| Diastase activity | Typically well above 8 DN when fresh | Reduced; can fall toward or below 8 DN |
| Invertase activity | Active | Reduced more than diastase |
| Glucose oxidase | Active | Reduced |
| HMF level | Low when fresh | Rises with heat and age |
| Total phenolics | Depends on floral source | Somewhat reduced |
| Pollen content | Present | Often removed (fine-filtered) |
| Propolis traces | Present | Often removed |
The takeaway: heat and fine filtering reduce honey's enzymes and remove its pollen, and the enzymes don't come back.
What does this mean for day-to-day use? If you're eating honey purely as a sweetener, processed clover honey gets the job done at a lower price. If you want honey's natural enzymes, pollen, and full flavor, choose raw. Just keep expectations realistic: honey is still mostly sugar, and the amounts of these compounds in a spoonful are small. For the one use with strong clinical evidence, see honey for sore throat and cough.
Frequently Asked Questions
Does Crystallized Honey Still Contain Enzymes?
Yes. Crystallization is a natural physical process where glucose molecules form crystals. It doesn't affect enzyme activity or antioxidant content. A crystallized jar of raw honey is just as nutritious as a liquid one. To reliquify, use a warm water bath below 104 degrees F -- never the microwave.
How Long Do Enzymes Stay Active in Stored Raw Honey?
Enzyme activity declines gradually with time, faster in warm conditions. Stored at room temperature, sealed and out of the sun, raw honey keeps useful enzyme activity for a long time, but fresher honey has more. Antioxidants are more stable than enzymes.
Can You Restore Enzymes to Processed Honey?
No. Once enzymes are denatured by heat, they can't be reactivated. The protein structures unfold permanently.
Is Darker Honey Always Better?
For antioxidant content, generally yes. The 2004 Journal of Agricultural and Food Chemistry study found a strong positive correlation between color darkness and antioxidant activity across all tested varieties. However, lighter honeys like acacia have their own culinary value -- they just aren't the best choice for health-focused use.
Disclaimer: This article is for educational purposes only and does not constitute medical or nutritional advice. While raw honey contains bioactive compounds supported by published research, individual results vary. Consult a healthcare provider for personalized dietary recommendations.
Last updated: September 22, 2026
Taste Northern California Raw Honey
Raw, unfiltered wildflower honey in 16, 32 and 64 oz. Never heated above 95°F, so the pollen and enzymes stay in.
16 oz · $24.99
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