|MadSci Network: Other|
Vitamins can become oxidized and lose their potency. This is very dependant on the temperature of storage, amount of direct light exposure, and moisture present.Unless dirty fingers or utensils have been used for the vitamins, bacteria/viral contamination would be rare. Vitamins will have expiration dates that is an approximate time,after which, some or most of the vitamins will start to lose their potency (of original concentration listed on the bottle). However, if the bottle is tightly closed and kept in a cool, dark place, a few months after the expiration date may have very little effect. It is very difficult to predict if 6 months, 8 months, or 2 years after the expiration date has caused degradation of each vitamin since there are so many variable factors to be considered. You could ask your local pharmacist, or call the 800 company number (if present on the bottle) for additional information. The company usually will stand by their expiration date, after which their product potency cannot be guaranteed. To be absolutely sure that you are getting the amount of vitamin concentrations described on the bottle, one would not use after the expiration date listed.
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