Medically reviewed by Lindsay Cook, PharmD Key Takeaways Vitamin D3 increases calcium absorption, while vitamin K2 activates the proteins that help bind that calcium into bone.Taking vitamins D3 and ...

Vitamin D2 and D3 are the two main forms of vitamin D. Vitamin D2 is present in plants and yeast, while D3 comes from animal sources. Vitamin D is essential for a range of bodily functions, such as ...