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Most studies show that vitamin D3 is more effective than vitamin D2 at raising blood levels of calcifediol (7, 8). For example, one study in 32 older women found that a single dose of vitamin...
Vitamin D comes in two forms: D2 and D3. D2 (ergocalciferol) comes from plants. D3 (cholecalciferol) comes from animals. You need a prescription to get D2. D3, however, is available over the counter. Your body more easily absorbs D3 than D2. Work with your healthcare provider to find out if you need a vitamin supplement and how much to take, if ...
Vitamin D comes in two forms: ergocalciferol (D2) and cholecalciferol (D3). You need a prescription for D2, but you can buy D3 over the counter. Vitamin D3 seems to be easier for your body to...
Both vitamin D2 and D3 can help a person meet their vitamin D requirements. This article will explain what D2 and D3 are, the differences between them, and what they do in the body.
Vitamin D deficiency — when the level of vitamin D in your body is too low — can cause your bones to become thin, brittle or misshapen. Vitamin D also appears to play a role in insulin production and immune function — and how this relates to chronic disease prevention and cancer — but this is still being investigated.
While vitamins D2 and D3 can both help boost vitamin D levels in people with a deficiency, research suggests that vitamin D3 is more efficiently absorbed and utilized by the body and may be better at increasing and maintaining vitamin D levels in the body.
Vitamin D deficiency is typically defined as having blood levels below 20 ng/mL, while levels from 21–29 ng/mL are considered insufficient. Most adults should get 1,500–2,000 international...