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About 70–90% of vitamin C is absorbed by the body when taken orally at normal levels (30–180 mg daily). Only about 50% is absorbed from daily doses of 1 gram (1,000 mg). Even oral administration of megadoses of 3g every four hours cannot raise blood concentration above 220 micromol/L. [19]
The US Recommended Dietary Allowance for vitamin C for adult women is 76 mg/day and for adult men 90 mg/day. Although Linus Pauling was known for highly respectable research in chemistry and biochemistry, he was also known for promoting the consumption of vitamin C in large doses. [ 25 ]
This means that half the women and more than half the men are not consuming the RDA for vitamin C. [21] The same survey stated that about 30% of adults reported they consumed a vitamin C dietary supplement or a multi-vitamin/mineral supplement that included vitamin C, and that for these people total consumption was between 300 and 400 mg/d.
Vitamin A supplements top Norman's do-not-fly list for his patients over 50. "Studies have shown that a healthy and diverse diet will get you enough vitamin A, and food sources are the best ...
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Emergen-C is an effervescent, powdered drink mix vitamin supplement manufactured by Alacer Corp. The Emergen-C product line was introduced in 1978. [1] Alacer was established as a private company in 1972, focusing on vitamin supplements containing vitamin C. The company was acquired by Pfizer in 2012.
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