The price or brand of a vitamin says almost nothing about its actual quality: dietary supplements — generic or premium — aren't required to prove their exact contents before they're sold, so what genuinely protects you is independent verification (USP, NSF), not the store label.
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Source: the USP (US Pharmacopeia) Dietary Supplement Verification Program and a comparative analysis of actual nutrient content in adult multivitamins, published in the American Journal of Clinical Nutrition. Evidence type: quality-control audits and lab assays, not clinical trials — this is a regulatory question, not a physiological one. Unlike generic prescription drugs, which must prove bioequivalence before hitting the market, dietary supplements (store-brand or premium) are only checked after the fact: independent testing has found real label-versus-measured-content gaps in both directions, for nutrients like selenium or iodine. So the video's point broadly holds up: a dollar-store bottle can genuinely contain what it claims, especially for a simple nutrient like vitamin C or D3. But it isn't a blanket guarantee: without third-party certification (USP Verified, NSF), neither price nor brand tells you whether the actual dose or nutrient form (B12 forms, for instance) matches the label.
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