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

Supplements Research Reveals Big Differences

Our supplements research reveals big differences, including dosage disparities, bioavailability and how much of a tablet is just filler.

A public health nutritionist with 20+ years at Which? and the NHS notes that if you're looking for a daily supplement, you might be tempted to go to your local pharmacy and pick out whatever's cheapest, but our testing reveals that's not always the best idea.

The contents of supplements differ more than you might think, and 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 greatly in effectiveness and content.

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Which? Which? — 2025-10-14

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