Opinion: I used to think supplements were all much the same, until we started reviewing them - Which?

Supplements Research Reveals Big Differences

Public health nutritionist with 20+ years at Which? and the NHS notes that supplements are not all the same.

Research by Which? found significant differences in supplements, including dosage disparities, bioavailability, and filler content.

you could end up paying for a less effective tablet - but equally paying a premium doesn't always pay off either

Author's summary: Supplements vary in effectiveness despite similar appearances.

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Which? Which? — 2025-10-14