Three ounces of wild sockeye salmon has 570 international units (IUs) of vitamin D—or about 70% of the recommended daily intake. While salmon is a great source of vitamin D, there are a few other ...

Learn about the benefits of taking vitamin D and vitamin K2 together. Discover how they benefit bone and heart health.

Medically reviewed by Erika Prouty, PharmD If you take vitamin D supplements to treat any deficiencies, it's essential to ...

Share on Pinterest A new study compared the vitamin D boosting capacity of two forms of vitamin D: D2 and D3. Viktoriya Skorikova/Getty Images Vitamin D deficiency is associated with an increased risk ...

Vitamin D is known to be essential to many aspects of human health — but a new study suggests that taking a certain form of it can have a negative effect. The more potent and longer-lasting form, ...

Vitamin D supplements come in two main types: D2 and D3, and a new meta-analysis finds that taking D2 often lowers blood levels of D3. The researchers pooled data from randomized controlled trials and ...

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Scientists discovered that vitamin D2 supplements can lower levels of vitamin D3, the form the body uses most effectively. Unlike D2, vitamin D3 enhances the immune system’s first line of defense ...

Taking one type of vitamin D supplement seems to cut the levels of another type that is more easily used by the body, which could affect our immune system. Our bodies create vitamin D when ultraviolet ...