What Should You Do With Expired Vitamins?
Grind up your old vitamins in a coffee grinder and add them to compost. If you or someone you know uses compost for gardening, extra vitamins can enrich the soil. According to the Mayo Clinic, expired vitamins lose potency. Potency may remain the same for small traces of minerals. The soil benefits from more minerals such as magnesium.
If you have house plants, sprinkle crushed vitamins in the pot. Your plant will especially benefit from added minerals.