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UK food supplement regulation under the Food Supplements Regulations 2003 (as retained EU law) and MHRA oversight. What regulation covers: permitted ingredients lists, maximum safe doses, labelling requirements, health claims under EFSA Regulation 1924/2006. What it does not cover: pre-market efficacy testing. The regulatory gap: supplements are not required to prove they work before sale — only that they are safe. This creates a market where ineffective products are legal. MHRA enforces against products making unauthorised medicinal claims.