Do vitamins/supplements really have a shelf life?

Question

I have some GNC purchased vitamins, for weightlifting, but have not used them in apprx. 6 months, due to an injury. Looking at the bottle there is an expiration date. How can a vitamin go bad? Is this just a ploy to get the consumer to use/purchase more in a timely manner? FYI, the product is Acetabolan III.

Answer 1

potency of any vitamin will decrease incrementally over time. And for much the same reason that fresh foods rot unless steps are taken to preserve them. But even preservatives will lose effectiveness over time, this is why there is an expiration date on vitamins.

Answer 2

They're typically not harmful after the exp date, but less effective (sometimes much less) and there's no good way to know how much of a dosage increase you'd need to get the effect of a full-potency dose...

Answer 3

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Answer 4

They don't go bad, but they lose their potency. They are still safe to take.