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Moderate evidenceImmunity

Propolis

Bee resin with genuine anti-inflammatory and antimicrobial activity — the best human data are for glycemic control and inflammatory markers in type 2 diabetes, not for the cold-and-flu claims it's mostly sold on. Composition varies enormously by region and season, so products are not interchangeable.

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What the science says

  • Glycemic control in type 2 diabetes Moderate evidence

    A meta-analysis of 6 RCTs in 373 adults with T2DM found propolis reduced fasting plasma glucose by 13.5 mg/dL (95% CI -25.0 to -2.0) and HbA1c by 0.52 percentage points (95% CI -0.94 to -0.10). Fasting insulin and HOMA-IR were unchanged, so the mechanism isn't clearly insulin sensitisation. Trials ran 8-18 weeks at 900-1500 mg/day; this is an adjunct, not a substitute for medication.

  • Inflammatory biomarkers Moderate evidence

    Pooling 20 RCTs with 1,139 participants, propolis lowered IL-6 (WMD -2.48 pg/mL) and TNF-alpha (WMD -0.86 pg/mL) versus control. CRP was not reduced overall (WMD 0.01), and only fell in trials lasting 10 weeks or longer. The clinical meaning of these marker shifts is unproven.

  • Oral lesions and dental plaque (topical) Limited evidence

    Small dental trials suggest propolis mouthrinses and gels speed healing of recurrent aphthous ulcers and modestly reduce plaque, but the studies are short, poorly blinded, and use widely differing extracts and concentrations. Nothing here establishes it as superior to standard chlorhexidine or topical corticosteroid care.

  • Preventing colds and respiratory infections Limited evidence

    Despite being the dominant marketing claim, no adequately powered RCT shows propolis reduces the frequency or duration of respiratory infections in healthy adults. In vitro antiviral activity has not translated into demonstrated clinical benefit.

Dosage & safety

Studied dose400-1500 mg/day of standardized extract; diabetes trials most often used 900-1500 mg/day for 8-18 weeks. Topical/oral formulations use 5-30% propolis in gels or rinses. Look for stated total polyphenol or flavonoid content — dose in milligrams of raw resin tells you little.
SafetyPropolis is a well-recognised allergen: contact dermatitis, oral mucosal reactions, and asthma exacerbations occur, especially in people sensitised to bee products, poplar resin, or balsam of Peru. Anyone with a bee or bee-product allergy should avoid it. Chemical composition differs sharply between poplar-type (European), Brazilian green, and red propolis, so trial results don't necessarily transfer between products. May add to the effect of glucose-lowering drugs — monitor if diabetic. Sold as an unregulated supplement in the US and EU, with no enforced standardization of active content.

How to take it

TimingTiming does not matter.
With food?Take it with food to reduce GI upset.
Worth knowingPoplar-type, Brazilian green and red propolis are chemically different products, so a trial result on one does not transfer to another - and total polyphenol content, not raw resin weight, is what to compare.

Interactions

With medications

  • insulin and other antidiabetic drugs

    Propolis lowers blood glucose additively in diabetes trials. monitor your glucose when starting

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does propolis help with blood sugar in diabetes?

Propolis has moderate evidence as an adjunct: a meta-analysis of 6 trials in type 2 diabetes found it lowered fasting glucose by 13.5 mg/dL and HbA1c by 0.52 percentage points at 900-1500 mg/day. It is not a substitute for diabetes medication, and you should monitor glucose if you combine them.

Does propolis prevent colds?

No adequately powered trial shows propolis reduces the frequency or duration of respiratory infections in healthy adults, despite this being its main marketing claim. The evidence is limited.

Is propolis safe if I am allergic to bees?

No: propolis is a well-recognised allergen causing contact dermatitis, mouth reactions and asthma flares, so avoid it with a bee or bee-product allergy. Sensitivity to poplar resin or balsam of Peru is also a warning sign.

How much propolis should I take?

Propolis doses range from 400-1500 mg/day of standardised extract, with diabetes trials using 900-1500 mg/day for 8-18 weeks. Compare products on total polyphenol or flavonoid content, since European, Brazilian green and red propolis differ chemically.

Scientific references

Where to buy

Vitacost, Bee Propolis Extract, 500 mg, 240 Capsules

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