Tag

Supplement safety

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Two salted salmon fillets on dark slate with lemon wedges and rosemary

Omega-3 and fish oil: uses, evidence, dosing and safety

Omega-3 has the strongest single result of any supplement on this site, a high-certainty 15% cut in triglycerides. It also has a dose-dependent harm signal that almost nobody selling it mentions.

Aug 6, 2026

A bowl of plain yogurt with strawberries and blueberries on a wooden table

verdict

Probiotics: uses, evidence, dosing and safety

Probiotics have one strong result, halving antibiotic-related C. difficile diarrhea, and a long list of weaker ones. Cochrane noted probiotic-company funding in 28 of the 47 trials it pooled.

Aug 6, 2026

Bunches of dark red grapes hanging on the vine among green leaves

verdict

Resveratrol: uses, evidence, dosing and safety

The original longevity molecule, and Cochrane could not find enough evidence to judge it either way in type 2 diabetes. Twenty years on, the human results are mostly small or absent.

Aug 6, 2026

Halved oranges and a grapefruit packed together, cut sides up

verdict

Vitamin C: uses, evidence, dosing and safety

Vitamin C has been tested against the common cold for sixty years and the answer is still a shrug: it may shorten one slightly, and taking it once a cold has started does almost nothing.

Aug 6, 2026