Supplement analysis backed by scientific evidence · PT

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Limited evidenceGeneral health

Royal Jelly

Expensive, heavily marketed, and thinly supported: the one clean meta-analysis found no effect on blood sugar, and the menopause and fertility claims rest on isolated small trials. The best-documented real-world effect is a risk of severe allergic reactions.

What the science says

  • Blood glucose and HbA1c Limited evidence

    A meta-analysis of 5 RCTs (205 participants for fasting glucose, 130 for HbA1c) found royal jelly lowered fasting plasma glucose by just 0.95 mg/dL (95% CI -5.83 to 3.87) and HbA1c by 0.32 points (95% CI -0.87 to 0.23) — neither statistically significant. This is a clear null result, not an underpowered hint.

  • Postmenopausal bone density Limited evidence

    In a 6-month double-blind RCT of 72 postmenopausal women taking dried royal jelly equivalent to 3,000 mg fresh daily, the placebo group lost femoral bone mineral density while the royal jelly group did not. But the authors report within-group rather than significant between-group differences, which is the weakest form of positive finding — hypothesis-generating at best.

  • Fertility, testosterone, and anti-aging effects Limited evidence

    These claims come almost entirely from rodent and in vitro work on 10-HDA and royalactin. There is no adequately powered human RCT supporting royal jelly for male fertility, testosterone, longevity, or skin aging.

Dosage & safety

Studied doseTrials used 1,000-3,000 mg/day of fresh-equivalent royal jelly for 8 weeks to 6 months. 10-HDA (10-hydroxy-2-decenoic acid) is the conventional standardization marker but is rarely declared on labels, so dose comparisons across products are largely meaningless.
SafetyRoyal jelly is a documented cause of anaphylaxis, acute bronchospasm, and severe eczema flares, with fatalities reported; risk is highest in people with asthma or atopy. Australia's TGA mandates an anaphylaxis warning on royal jelly products for this reason. Avoid entirely with any bee-product allergy. Unstudied in pregnancy. Contains compounds with weak estrogenic activity in vitro, so caution is usually advised in hormone-sensitive conditions, though human data are absent. Anticoagulant interaction has been reported in isolated case reports with warfarin.

Scientific references

Where to buy

NOW Foods, Ginseng & Royal Jelly, 90 Capsules

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