How do you counsel patients who ask if they should take a daily multivitamin?

Here is what I typically recommend to patients in my primary care practice:

1. Most healthy adults who eat a balanced diet, including lots of produce/plants, do not need to take a daily multivitamin. They are expensive, and whole foods are a better form of micronutrients than manufactured vitamins.
2. There are recent studies showing a link between multivitamin supplementation and cognitive function in older patients (i.e., prevention of cognitive decline), but again, I typically just recommend a div...