Medically reviewed by Ashley Baumohl, RD Vitamin D (calciferol) is a fat-soluble vitamin that helps support strong bones, ...

2. Supports the immune system: It reduces the risk of infections, particularly during flu season or for those with low vitamin D levels.

Vitamin D supplements are popular for bone health and immunity. When is the best time to take vitamin D? Here's how to take it properly, according to experts.

There are two types of vitamin D supplements available for over-the-counter purchase (vitamin D2 and vitamin D3). Vitamin D3 is the type that most experts believe should be utilized in clinical ...

How to get more vitamin D Vitamin D can be divided into two types: D2 and D3. Vitamin D2 is found in plants, while D3 — which is considered the more effective form — is found in animal sources ...

Vitamin D3 seemed more effective than D2 at raising this important blood test. Furthermore, preliminary work showed that enzymes in the liver and the final vitamin D receptors (VDR) in important ...

When selecting a vitamin D supplement, you may want to choose D3 over D2. Both are easily absorbed by the body, but research suggests that vitamin D3 increases blood levels of the nutrient more and ...

Take vitamin D by mouth as directed. Vitamin D is best absorbed when taken after a meal but may be taken with or without food. Alfacalcidol is usually taken with food. Follow all directions on the ...