Medically reviewed by Jonathan Purtell, RDN The best time to take vitamin C to boost your immune system is with meals ...

The recommended amounts of vitamin C vary by age and are measured in milligrams (mg). Vitamin C deficiency is rare in the United States, and while taking too much vitamin C isn't dangerous ...

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.