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Why do vitamin supplements have expiration dates?


As the tablets become exposed to sunlight, oxygen and moisture, vitamins may gradually lose potency. Although they do not become "toxic" or harmful, they may not provide the results the practitioner and consumer depend upon. In order to set expiration dates, the manufacturer must perform stability tests showing how much degradation of the product occurs over time, and put in enough of the raw material to compensate for any lost potency. Expiration dates ensure that the product will provide consistent results.

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