Most supplement labels say to store the product in a cool, dry place, and most buyers ignore that advice. Heat, light, and humidity degrade active ingredients over time, so a bottle kept on a sunny windowsill or above a cooker may lose potency long before its expiry date. Capsules can soften, powders can clump, and oils can turn rancid — all without any visible warning.
The fix is simple: keep supplements in a cool cupboard away from heat sources and moisture, keep lids tightly closed, and avoid transferring tablets into unlabelled containers where you lose the expiry date and the dose information. Fridge storage is only right when the label says so; cold, damp air can harm some products as much as heat harms others.
Good storage only helps if the product was worth buying in the first place. The Supplement Rating explains that judgement in its label-checking guide, which covers dose disclosure, blend transparency, and testing claims. For a worked example, see a review of a botanical eye-health formula, and visit the homepage of The Supplement Rating for independent, evidence-led reviews.
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