human
My doctor says I should start taking a vitamin. Which one should I buy?
assistant
It depends on your health and dietary needs. A good place to start is the RDA (Recommended Dietary Allowance) for vitamins and minerals, which can be found in the US National Library of Medicine at https://www.ncbi.nlm.nih.gov/books/NBK25500/. You can also consult with your healthcare provider to determine what vitamins and minerals you may need based on your individual health profile.