Dietary supplements While the FDA does not require expiration dates for nutritional dietary supplements, manufacturers often include this information in an effort to ensure products provide consistent results.To set an expiration date, a manufacturer must perform stability tests to determine active ingredient degradation over time.Fatty acids and antioxidants, including vitamin E and the carotenoids (beta-carotene, xanthins, luteins, etc.), should be stored in dry, cool areas and tightly sealed to protect them from air oxidation.Polyunsaturated oils are especially vulnerable to oxidative damage at room temperature.Minerals should be stored in dry, room temperature or cool areas.These include both macrominerals (calcium, chloride, magnesium, phosphorous, potassium, sodium, sulfur) and trace minerals (boron, cobalt, copper, chromium, iron, iodine, manganese, molybdenum, selenium, silicon, vanadium, zinc) -- including chelated mineral forms.Wastewater treatment plants are not designed to remove and destroy drugs, and doing so can lead to contamination of drinking water as well as oceans, lakes and rivers.
To ensure potency of any substance, make sure you store it safely.
Thus, store all essential fatty acids in dark bottles in the refrigerator once they are opened.
With all this said and done, the shelf-life of most, if not all, dietary supplements is much longer than the usual period of normal consumption or use.
Always keep drugs and supplements in their original packaging.
Keep them out of heat, moisture and light, and only refrigerate them if told to do so by your pharmacist.