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

You can get vitamin D3 from sun exposure and meat, such as fish oil and egg yolk. You can get vitamin D2 from plants. Vitamin D is more than just one vitamin. It’s a family of nutrients that shares ...

Everyday Health independently vets all recommended products. If you purchase a featured product, we may be compensated. Learn why you can trust us. Adding vitamin D supplements to your diet can help ...

Vitamin C is also available by prescription as an injection. The injectable vitamin C can be given into a vein (intravenously), into a muscle (intramuscularly), or under the skin (subcutaneously).

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), ...