People who don’t get enough vitamin B12 through their diets may need a supplement to fill the gap. Here’s how much to take.

A new study found that vitamin D supplementation improved a key marker of biological aging—but it's probably too soon to rush to the drugstore. Here's what to know.

Q: Do seniors need any special vitamins? A: Our nutritional needs change as we age. And sometimes, several key vitamins and minerals can be low or deficient in older adults. Pop a vitamin, right? But ...

Scientists are still untangling why the nutrient gap persists—and what it reveals about how women’s health is studied and treated.