Taking too much vitamin D can cause serious side effects. Learn the signs, why you might feel weird after taking it, and when to talk to your healthcare provider.

Vitamin D3 and vitamin K2 work together to support bone strength, improve calcium use, and help maintain healthy bone density.

What is vitamin D3? Your body creates this vitamin naturally when exposed to sunlight. In the winter, however, we tend to stay inside more, making it harder to get the proper amount of D3. There are a ...

Like other vitamins, vitamin D is a substance needed for health but only in tiny amounts. Unlike other vitamins, it doesn't occur naturally in many foods (except seafood, mushrooms, and egg yolks), ...

A groundbreaking study is reshaping the conversation about longevity—and it focuses on a simple vitamin many Americans ...