Most vitamin D3 supplements available over-the-counter are sold in dosages between 1000–5000 IU, but some are higher. “Ask ...

Bloomer says he takes 1,000 International Units of vitamin D3 daily because most people in the US are deficient. "I do get outside a good amount. So for me, and I've had my blood levels checked ...

Breastfed infants and children with certain medical conditions are also susceptible to vitamin D deficiency. If a healthcare professional has recommended a vitamin D supplement for calcium ...

Historically, 400 IU (10 ug) of vitamin D was recommended for better health because it closely approximated the amount of vitamin D in a teaspoonful of cod liver oil. However, 800 to 1,000 IU is ...

He was diagnosed with scurvy and treated with daily vitamin C (1,000 mg), vitamin D3, folic acid and multivitamin supplements, after which his painful rash and other symptoms cleared up.