Please read and agree to the disclaimer before watching this video. . Here are the references and my notes Vitamin C (Ascorbic Acid) Found in plants, citrus fruits, tomatoes, and green vegetables Water soluble hence extra dose is peed out. Deficiency causes scurvy Large doses cause diarrhea Reason that people looked into it was that the people with vitamin C deficiency had more occurrences of pneumonia. Normal dose is 90 mg/day. Add 30 mg/day for pregnant women, and 35 mg/day for smokers. Functions: Antioxidant Neutralize reactive oxygen species or free radicals. Needed in procollagen hydroxylation during the collagen synthesis.