What is raw honey and how is it different from regular honey?

Raw honey is extracted from the hive and strained without heating above 118°F (48°C) or pasteurizing. Regular honey is pasteurized at 150–170°F, which kills beneficial enzymes, reduces antioxidant content, and destroys natural yeasts. Raw honey retains all its pollen, propolis, and 200+ bioactive compounds.

Does honey expire or go bad?

Honey is one of the only foods that never truly expires when stored properly. Its low moisture content (below 18%), acidic pH (3.2–4.5), and natural hydrogen peroxide production inhibit bacterial growth. Archaeologists have found 3,000-year-old honey in Egyptian tombs that was still edible. Crystallization is normal and does not mean honey has gone bad.

How many types of honey are there?

There are over 300 distinct honey varieties worldwide, classified primarily by floral source. Common types include clover, wildflower, manuka, buckwheat, acacia, and orange blossom. Each variety has a unique flavor profile, color, and nutritional composition determined by the nectar source.

Is honey healthier than sugar?

Honey contains antioxidants, enzymes, vitamins, and minerals that table sugar lacks entirely. A 2022 meta-analysis of 18 clinical trials found honey lowered fasting blood glucose, total cholesterol, and triglycerides compared to sugar. However, honey is still a concentrated sweetener at 64 calories per tablespoon and should be consumed in moderation.

How can you tell if honey is real or fake?

Look for "True Source Certified" or single-origin labeling. Real honey crystallizes over time (fake honey often stays liquid indefinitely), has a complex aroma matching its floral source, and lists only "honey" as an ingredient. Lab testing (C4 sugar analysis, NMR profiling) is the only reliable way to detect adulteration — home tests like the water or thumb test are unreliable.

Can you give honey to babies?

Never give honey to infants under 12 months old. Honey can contain Clostridium botulinum spores that cause infant botulism — a rare but potentially fatal illness. After age 1, a child's digestive system is mature enough to handle these spores safely. This applies to all forms of honey, including cooked and baked goods containing honey.

Original research · April 2026

The Honey Viscosity Spectrum

Acacia pours at about 9 pascal-seconds. Buckwheat pours at 18. Calluna heather, at rest, behaves like a soft gel at over 100 — but stir it and it collapses back to a ten. We plotted 17 of the most commonly sold honeys on a single viscosity axis, mapped how that number moves with temperature and moisture, and explained why two of them break the rules entirely.

Based on Yanniotis et al. 2006, Juszczak & Fortuna 2006, Lazaridou et al. 2004, Mossel et al. 2000, Bhandari 1999, and Pryce-Jones 1944. Method: /learn/methodology. Updated April 18, 2026 · ~7 min read.

9 → 100

Pa·s range at 20 °C

acacia to heather gel

~6–8 °C

Halves viscosity

Arrhenius, Ea ≈ 85 kJ/mol

−35%

Per +1% moisture

Yanniotis 2006

Thixotropic outliers

Mānuka · Calluna heather

Finding 1 — the spectrum

Every common honey, plotted on one viscosity axis

Of the 17 varieties we looked at, 2 land in the "runny" tier (below 11 Pa·s), most sit in an "everyday" 11–14 Pa·s band, and 7 sit above that — with Mānuka and Calluna heather in a class of their own because they are not Newtonian fluids at all.

Runny(< 11 Pa·s)Typical(11–14 Pa·s)Thick(15–25 Pa·s)Gel-like(> 40 Pa·s (thixotropic))dashed = thixotropic (viscosity drops on stirring)

Values are typical dynamic viscosity at 20 °C for honey at ~17 % moisture, aggregated from Yanniotis 2006, Juszczak & Fortuna 2006, Lazaridou 2004, Mossel 2000, and Bhandari 1999. See methodology. Individual jars vary ±20 % with moisture and post-harvest handling.

For intuition — everyday fluids at 20 °C

Water0.001 Pa·s
Olive oil0.084 Pa·s
Maple syrup (grade A)0.2 Pa·s
Glycerine1.4 Pa·s
Molasses8 Pa·s
Peanut butter250 Pa·s

Water is 0.001 Pa·s — a typical honey is ~10,000× more viscous than water and ~100× more viscous than olive oil at the same temperature.

Finding 2 — temperature

Viscosity halves for every 6–8 °C you warm the jar

Honey viscosity follows the Arrhenius equation with an activation energy of roughly 85 kJ/mol — one of the highest values seen in any common food. Practically, this means a jar of buckwheat that is thick and slow at 20 °C pours almost like maple syrup at 40 °C. It is also why warming a crystallized jar in a 35–43 °C water bath is such an efficient way to re-liquefy it — but heating past 40 °C starts to destroy invertase and diastase, two of the enzymes that define "raw" honey.

Curves use the Arrhenius model η(T) = η₂₀ · exp(Eₐ/R · (1/T − 1/293)) with activation energy Eₐ ≈ 85 kJ/mol — the median reported for honey by Mossel et al. 2000 and Juszczak & Fortuna 2006. Above 40 °C, viscosity has dropped 10-fold from pantry temperature but enzymes and volatile aromatics start to degrade. Keep decrystallization water baths below that mark.

Finding 3 — moisture

A 1% jump in moisture is a 35% drop in viscosity

Beyond floral source, the single biggest lever on honey viscosity is how much water it contains. Yanniotis et al. (2006) ran a temperature-controlled rheometer on Greek honeys across a 15.2–18.9 % moisture range and recovered a tight log-linear relationship: each 1 % of extra water cuts viscosity by about 35 %. This is also why the USDA Grade A ceiling of 18.6 % moisture matters — above that threshold, viscosity drops far enough that honey-active yeasts can start to move through the jar and ferment the sugars.

Rule of thumb: every +1 % moisture ⇒ about −35 % viscosity. A 16 %-moisture buckwheat pours like a 19 %-moisture acacia.

Dashed trend line is the Yanniotis 2006 regression log₁₀ η ≈ 3.7 − 0.16 · W where W is moisture in %. Thixotropic honeys (Mānuka, Heather) are omitted — their apparent viscosity depends on shear history, not moisture.

Finding 4 — the exceptions

Two honeys that break the viscosity rules entirely

Almost every honey on Earth is a simple Newtonian fluid — shear it faster, it resists the same way. Two widely-sold varieties are not. Both behave like gels at rest and thin dramatically when stirred.

Calluna heather

The original thixotrope

First characterised in the honey literature by Pryce-Jones (1944) and followed up by Williams & Williams (1987) on the Jura heather flow. Calluna heather honey contains about 2 % protein, roughly double typical honeys, and these proteins form a physical network that holds the honey as a soft gel. At rest, apparent viscosity can exceed 100 Pa·s — but shearing it in a rheometer (or pricking the comb cells as commercial heather beekeepers do) collapses the viscosity by roughly 70 % to around 30 Pa·s. Leave it alone for a few hours and the gel rebuilds.

See our heather honey guide for flavour and provenance.

Leptospermum (Mānuka)

The commercially important one

Mānuka honey has a milder but still clearly measurable thixotropic signature — apparent viscosity of roughly 80 Pa·s at rest, collapsing to 20–30 Pa·s under steady shear (Bhandari et al. 1999). The mechanism is similar: a small protein fraction and unusually high levels of oligosaccharides and methylglyoxal-pathway intermediates build a weak network that falls apart when stirred. Practically, this is why Mānuka jars resist being scooped in their first second of contact — and why the industry standard is a wide-mouth jar that lets a spoon break the gel before you pull.

Full variety profile at /learn/manuka-honey-benefits.

Thixotropy slows crystallization too. Crystal growth is diffusion-limited — glucose molecules have to migrate to the crystal face. A honey that behaves like a gel at rest physically slows that migration, which is why Mānuka often stays visually liquid for 9–18 months even though its glucose/water ratio would otherwise predict medium-speed crystallization. The full analysis is in our crystallization timeline.

Practical rules

Four rules for matching viscosity to how you actually use honey

1 · If you want it to drizzle

Yoghurt, hot tea, ice cream

Pick a runny tier — acacia, orange blossom, or tupelo. Viscosity below 11 Pa·s at 20 °C means a thin ribbon forms from a tilted spoon instead of a blob.

2 · If you want it to sit still

Cheese boards, toast, scones

Reach for a thick tier or a thixotropic honey — chestnut, buckwheat, or Calluna heather. A dollop holds its shape long enough to photograph.

3 · Warm before you pour thick honey

Squeeze bottles, decorating

Thick honey in a cold kitchen is a nightmare in a squeeze bottle. Warm the bottle to ~30 °C in a warm-water bowl for 5 minutes — viscosity drops by 65 % and you get a clean ribbon. Never exceed 40 °C (enzymes start to degrade).

4 · Stir thixotropic honey before serving

Mānuka and Calluna heather

Run a spoon through the jar in a slow circle for 10–15 seconds before your first serve. The gel network collapses, viscosity drops 60–70 %, and the honey behaves like an ordinary thick honey for the next hour. Leave it untouched and it rebuilds.

Keep going

Viscosity is one of two physical properties that define how a honey behaves in a jar. The other is crystallization — we mapped it the same way.

Crystallization Timeline →State of Raw Honey 2026 →Browse the catalog

Methodology & caveats

Viscosity values are typical dynamic viscosity (Pa·s) at 20 °C and at a moisture content near 17 %. They aggregate peer-reviewed rheometer measurements from Yanniotis 2006 (Greek), Juszczak & Fortuna 2006 (Polish), Lazaridou 2004 (Greek), Mossel 2000 & Bhandari 1999 (Australian), and Oroian 2013 (Spanish/Romanian). Each jar you open will vary ±20 % based on moisture and provenance.
The Arrhenius activation energy (Eₐ ≈ 85 kJ/mol) is a median of published values. Fast-crystallizing honeys near their nucleation threshold can show Eₐ over 100 kJ/mol; very runny acacia often sits near 75 kJ/mol.
The moisture regression (log₁₀ η ≈ 3.7 − 0.16 · W) is the Yanniotis 2006 relationship for Greek unifloral honeys at 20 °C. It predicts Newtonian honeys within about ±15 %; thixotropic varieties are excluded because their apparent viscosity depends on shear history.
"Thixotropic" viscosities for Mānuka and Calluna heather are at-rest apparent values. Under steady shear in a rheometer they drop by 60–70 %. Both rebuild on standing over minutes to hours.
Full data lineage and primary-source list: /learn/methodology.

RHG

Raw Honey Guide Editorial Team

Reviewed by certified beekeepers and apiculture specialists. Our editorial team consults with professional beekeepers, food scientists, and registered dietitians to ensure accuracy. Health claims are cited against peer-reviewed literature from Cochrane, JAFC, BMJ, and Nutrients.

Expert ReviewedFact CheckedEditorial Policy ↗

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Frequently asked questions

Which honey is the runniest?+

Acacia honey (Robinia pseudoacacia) is the runniest common honey, typically around 9 Pa·s at 20 °C — about 9,000 times more viscous than water but only about 100 times more viscous than olive oil. Acacia has the highest fructose/glucose ratio of any major commercial honey (often above 1.5), and fructose is the more water-soluble sugar, which keeps the honey fluid. Orange blossom and tupelo come in second, at roughly 10–11 Pa·s.

Which honey is the thickest?+

Among ordinary Newtonian honeys, honeydew and buckwheat are the thickest, at 18–20 Pa·s at 20 °C. But the true champions are Mānuka and Calluna heather honey, both of which are thixotropic — they behave like a soft gel at rest (apparent viscosity of 80–100+ Pa·s) but liquefy when stirred. The Pryce-Jones 1944 paper in the Annals of Applied Biology is the classic description of heather honey gel behaviour; it is caused by a protein network, not by crystallization.

What is thixotropy in honey?+

Thixotropy means the honey's viscosity drops when you stir, swirl, or shake it and slowly rebuilds when it is left to rest. Mānuka and Calluna heather are the two widely-sold thixotropic honeys. A ~2 % protein fraction forms a loose three-dimensional network that holds the honey in place like a soft gel; physical shearing breaks those links and the viscosity collapses by about 70 %, only to rebuild over minutes to hours. Producers extract heather honey with a pricking apparatus that breaks the gel so the honey will actually drain from the comb.

How does temperature affect honey viscosity?+

Strongly and exponentially. Honey follows the Arrhenius model with an activation energy of roughly 85 kJ/mol, which means viscosity approximately halves for every 6–8 °C rise in temperature. A honey that is 10 Pa·s at 20 °C is about 3 Pa·s at 30 °C and about 1 Pa·s at 40 °C — a ten-fold drop over just 20 degrees. Conversely, refrigerating honey at 4 °C roughly quadruples its viscosity versus a warm kitchen counter.

How does moisture content affect honey viscosity?+

Moisture is the single biggest chemical lever on honey viscosity. Yanniotis et al. (2006) showed that log₁₀ viscosity falls roughly 0.16 units for every 1 % rise in moisture — which means each 1 % of extra water cuts viscosity by about 35 %. A honey at 18.5 % moisture (the legal U.S. Grade-A ceiling) will pour roughly half as thickly as the same honey at 16 % moisture. Drier honey also crystallizes faster and keeps longer — it is why most premium beekeepers target 15.5–17 %.

Why does honey seem thicker after it sits in the fridge?+

Two independent effects stack. First, pure Arrhenius thermodynamics — every 6–8 °C drop roughly doubles viscosity, so a fridge at 4 °C makes honey about 4–5 times more viscous than a warm pantry. Second, refrigeration accelerates crystallization, and a honey that is partially crystallized presents a much higher apparent viscosity because the suspended glucose crystals resist flow. Both effects reverse when the jar warms back to room temperature, though crystallization requires a gentle water bath at 35–43 °C to fully re-dissolve.

Is thicker honey better honey?+

Not necessarily — thickness just reflects composition. A very thin honey suggests either a high-fructose floral source like acacia or, more concerningly, high moisture (>18.6 %) from early extraction or poor storage; high-moisture honey is at risk of fermentation. A very thick honey usually means either a dark monofloral like buckwheat or chestnut, a forest honeydew, or one of the thixotropic varieties. The honest answer: match viscosity to use. Runny honeys drizzle beautifully over yoghurt and hot drinks; thick honeys hold their shape on cheese boards and toast.

How does viscosity relate to crystallization?+

Viscosity slows crystal growth kinetically. Crystallization requires glucose molecules to diffuse through the honey to a growing crystal face; if the honey is very viscous, diffusion is slow and crystal growth is slow. This is why Mānuka honey often stays visually liquid for 9–18 months even though its glucose-to-water ratio would otherwise predict medium-speed crystallization — its thixotropic high viscosity physically holds back the glucose. See our companion data story, the Honey Crystallization Timeline, for the full F/G and G/W analysis.