This high-potency supplement contains 125 mcg, or 5,000 IU of vitamin D3 in each serving. As a bonus, this product has been third-party tested for potency and purity. This article looks at how much ...

Vitamin K is the name of a family of compounds with a similar structure. Vitamin K3, also known as menadione, is a synthetic or artificially produced form of vitamin K. Vitamin K3 is a synthetic, ...

Vitamin D tests involve taking a blood sample to measure the vitamin D levels in your bloodstream. There are two forms of vitamin D in the blood: 25-hydroxy vitamin D, or calcidiol, and 1,25-dihydroxy ...

Vitamin A is an essential micronutrient that plays a key role in many aspects of health. Though it is found naturally in a variety of food sources, many people also choose to supplement with vitamin A ...

What Is Vitamin B Complex? Vitamin B complex is a supplement that contains eight B vitamins that perform important and related roles in your body’s cellular function. The vitamins that make up B ...