Supplement analysis backed by scientific evidence · PT

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Limited evidenceHeart & metabolic

Chromium

Chromium picolinate is sold for blood sugar and weight loss on the strength of noisy, low-quality meta-analyses. The pooled weight-loss effect is half a kilogram, the glycaemic findings are drowned in near-total heterogeneity, and chromium's status as an essential human nutrient is itself now disputed.

What the science says

  • Weight loss effect is real but trivially small Limited evidence

    A meta-analysis of 20 included trials, 11 pooled, found chromium beat placebo for weight loss by 0.50 kg (95% CI 0.03-0.97 kg), with high statistical heterogeneity and variable reporting quality. Half a kilogram over several months is clinically meaningless; the review's own authors stated the magnitude is small and the clinical relevance uncertain.

  • Glycaemic effects are unreliable Limited evidence

    A 2020 meta-analysis of 28 trials in type 2 diabetes reported reductions in fasting glucose (-19.0 mg/dL, 95% CI -36.15 to -1.85) and HbA1c (-0.71%, 95% CI -1.19 to -0.23) — but with I-squared of 99.8% for fasting glucose, meaning the trials disagree so violently that the pooled number carries little information. An earlier AJCN meta-analysis found no effect on glucose or insulin in people without diabetes, and well-conducted trials in metabolic syndrome have been null.

  • Not established as an essential nutrient Limited evidence

    No unambiguous case of dietary chromium deficiency has ever been described in a person eating ordinary food, and no chromium-dependent human enzyme has been identified. The European Food Safety Authority concluded chromium is not essential for humans and declined to set an intake recommendation. The "glucose tolerance factor" story that launched the entire supplement category has not held up.

Dosage & safety

Studied doseThe US adequate intake is 35 mcg/day for men and 25 mcg/day for women, derived from observed dietary intakes rather than any measured requirement. Trials use 200-1,000 mcg/day of chromium picolinate or chromium chloride, most commonly 400-600 mcg/day for 8-24 weeks. Picolinate is absorbed better than chloride, but neither form has a demonstrated clinical advantage over the other or over nothing.
SafetyGenerally well tolerated; adverse events reported in trials include watery stools, headache, vertigo and urticaria. There are isolated case reports of renal impairment, rhabdomyolysis and hepatotoxicity with high-dose chromium picolinate, and picolinate has raised unresolved in vitro genotoxicity concerns. Do not confuse trivalent chromium (the supplement form) with hexavalent chromium, an industrial contaminant and established carcinogen — they are chemically and toxicologically distinct. Chromium may add to the glucose-lowering effect of insulin, sulfonylureas and other antidiabetic drugs, so anyone on those should monitor blood glucose. Use caution in kidney or liver impairment; avoid in pregnancy above dietary amounts given the absence of safety data.

Scientific references

Where to buy

NOW Foods, Chromium Picolinate, 200 mcg, 250 Veg Capsules

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