In the ABCs of vitamins, it's one of the most important — but too much vitamin A can also cause problems, which is why it's important to know if you actually need a supplement.

Vitamin C is vital for many important processes in your body, and citrus fruits aren't the only way to get enough of it. Here are 20 foods that are high in vitamin C.

$20.99 at Amazon. Orange Vitamin D3. Rated at 4.7 stars by over 6,000 happy customers on Amazon, this daily vitamin is a tried-and-true product that's affordable and even offers a refreshing ...

Vitamin D is more than a bone builder. ... and showing up day after day, vitamin D is one of the most underrated tools in your corner. ... Most athletes do well with 2,000 to 5,000 IU per day.

Vitamin A supports healthy eyes, skin, immune function, and more. Who needs a supplement? Experts discuss the benefits, risks, and how to take them.

Vitamin B12 is a crucial nutrient required to keep your cells and blood cells healthy. It also helps the body make DNA, the genetic material in all of the cells. As the body doesn't make vitamin ...