Supplement analysis backed by scientific evidence · PT

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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.

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.

Scientific references

Where to buy

Vitacost, Bee Propolis Extract, 500 mg, 240 Capsules

View on iHerb

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