Third-party-testing

Supplement retailers stock hundreds of products with widely varying quality, evidence, and value. This guide explains how to evaluate any dietary supplement using the same standards researchers and healthcare professionals apply.

The UK supplement industry is large and poorly differentiated from a quality perspective. Understanding which quality signals are meaningful — GMP certification, third-party testing, EFSA claims — versus which are marketing language helps consumers make better-informed choices.

GMP (Good Manufacturing Practice) is a quality system for supplement manufacturing. This article explains what GMP standards require, how they differ across certifications, and how to verify that a product's GMP claim is backed by independent audit.

Where you buy supplements matters less than what you buy and how you verify quality. This article covers the UK supplement retail landscape, quality verification methods, and regulatory red flags to avoid.