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Moderate evidenceGeneral health

Piperine (Black Pepper Extract)

Piperine is not a health supplement — it is an absorption enhancer, and for a few compounds (most famously curcumin) it genuinely works. The same mechanism that makes it useful is also its main risk: it raises blood levels of prescription drugs.

What the science says

  • Dramatically increases curcumin absorption Moderate evidence

    The landmark human pharmacokinetic study gave healthy volunteers 2 g curcumin with 20 mg piperine and reported a 2000% increase in curcumin bioavailability, with concentrations barely detectable when curcumin was given alone at the same dose. Nearly every curcumin + BioPerine product on the market traces back to this single study — the effect is large and mechanistically well explained (inhibited glucuronidation and efflux), but it rests on a small pharmacokinetic dataset, not on repeated outcome trials.

  • Curcumin-piperine combinations improve lipid markers Moderate evidence

    A systematic review and meta-analysis of RCTs in metabolic syndrome and related disorders found curcumin plus piperine significantly reduced total cholesterol and LDL-C, with no significant change in triglycerides. Read this correctly: the clinical benefit is attributed to the increased curcumin exposure, with piperine as the delivery vehicle.

  • Piperine alone is not a fat burner, testosterone booster or nootropic Limited evidence

    Marketing claims lean on rodent thermogenesis studies, enzyme assays and cell work. There are no adequate human trials showing that 5-20 mg/day of piperine on its own changes body weight, body fat, appetite, testosterone or cognition. When you see piperine listed on a fat-burner label, it is there to enhance the other ingredients — or to pad the ingredient count.

Dosage & safety

Studied dose5-20 mg/day of 95% piperine extract (BioPerine and equivalents), taken at the same time as the compound it is meant to enhance. The curcumin study used 20 mg piperine with 2 g curcumin. Higher doses add interaction risk without added benefit. Ground black pepper is roughly 5-9% piperine, so about a teaspoon lands in the same range — with far more variability.
SafetyThis is the section that matters. Piperine inhibits CYP3A4 and CYP2C9, blocks P-glycoprotein efflux, and slows gastrointestinal transit, all of which can raise blood levels of co-administered drugs — reported or predicted interactions include phenytoin, carbamazepine, propranolol, theophylline, rifampicin, midazolam, some statins and immunosuppressants such as tacrolimus and cyclosporine. Treat piperine like grapefruit juice: if you take any prescription medication, ask a pharmacist before adding it. Gastric burning, reflux and nausea are common at higher doses and with peptic ulcer disease or GERD. Avoid supplemental doses in pregnancy (adverse reproductive effects at high doses in animals) and in children. Not banned in sport.

Scientific references

Where to buy

Source Naturals, BioPerine®, 10 mg, 120 Tablets

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