Vitamins are a common over-the-counter (OTC) product purchased by people to maintain good health. And while many vitamins and supplements do have health benefits, vitamins do not automatically qualify as an eligible medical expense under IRS rules. This makes purchasing them with a flexible spending account (FSA) or health savings account (HSA) tricky. But, you can buy your vitamins with FSA and HSA funds if certain criteria is met. Click here to read more.