Many people are saying up to 1200 units every ... pill now have 400 D in the pill. It's interesting that multi-vitamins sometimes have D2 instead of D3. What does that mean? Vitamin D2 is from ...

Medically reviewed by Ashley Baumohl, RDVitamin D (calciferol) is a fat-soluble vitamin that helps support strong bones, maintain muscle function, strengthen the immune system, and promote mental well ...