Supplement analysis backed by scientific evidence · PT

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Limited evidenceHeart & metabolic

Citrus Bergamot

Bergamot polyphenols show promising cholesterol and glucose reductions, but almost all the positive data come from a small cluster of trials by overlapping research groups in one region. Independent replication is thin.

What the science says

  • Lowers LDL and total cholesterol Limited evidence

    A systematic review of human bergamot trials found LDL reductions ranging from roughly 15% to nearly 40% at 500-1,000 mg/day of standardised bergamot polyphenol fraction over 30-180 days. The catch: the largest effects come from a handful of Italian trials with the same investigators, small samples, and in some cases inadequate blinding or missing placebo. Effect sizes of this magnitude would rival a moderate-intensity statin, which is implausible without replication.

  • Improves glucose and insulin markers Limited evidence

    Several small trials in metabolic syndrome report reductions in fasting glucose of around 15-20 mg/dL and improved HOMA-IR. Sample sizes are typically under 100, follow-up is short, and results have not been confirmed in larger independent trials.

  • Reduces liver fat in NAFLD Limited evidence

    A few pilot studies report improved ultrasound steatosis grade and liver enzymes. These are preliminary, mostly open-label or small, and no biopsy-confirmed or large controlled trial exists.

Dosage & safety

Studied doseStudies used 500-1,000 mg/day of standardised bergamot polyphenolic fraction (BPF), typically providing around 15-20% total flavonoids and standardised for brutieridin and melitidin, taken before meals for 30-180 days. Some trials split the dose twice daily. Products vary hugely — bergamot juice, essential oil and polyphenol extract are not interchangeable, and the essential oil is not the studied material.
SafetyShort-term human data suggest good tolerability, with mild heartburn and gastrointestinal upset the main reports; long-term safety beyond 6 months is essentially unstudied. Bergamot, like grapefruit, contains furanocoumarins that inhibit intestinal CYP3A4 — this can raise blood levels of statins, calcium channel blockers, ciclosporin and many other drugs. Bergamot essential oil (not the oral extract) contains bergapten and is strongly phototoxic on skin. Because bergamot may lower glucose, people on insulin or sulfonylureas should monitor for hypoglycaemia. Avoid in pregnancy and breastfeeding due to absent data.

Scientific references

Where to buy

The Vitamin Shoppe, Citrus Bergamot, 500 mg, 60 Vegetable Capsules

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