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

Supplements Review

According to a public health nutritionist with over 20 years of experience at Which? and the NHS, supplements can vary significantly in terms of dosage, bioavailability, and filler content.

Research by Which? reveals that choosing the cheapest supplement may not always be the best option, as the contents can differ substantially, potentially leading to less effective tablets.

Paying a premium for supplements does not necessarily guarantee better quality either.

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

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

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Which? Which? — 2025-10-14