Here is an example to show how little we really know. Vitamin C is the vitamin we seem to know the most about. Back in 1941 a set of guidelines, called RDA's for Recommended Dietary Allowances, were accepted. The RDA for Vitamin C was 60 to 90 mg because that was the amount that kept our sailors from
getting scurvy if they were aboard ships for long periods. The data, for this important vitamin, from 73 years ago, is still used today and many people believe that is the correct amount of vitamin C to take.
Since then we have learned that we are one of the few animals who don't make vitamin C we have to ingest it. In studying the other animals of the world we find that they manufacture hundreds of times our daily allowance every day. Even vitamin C that we can buy in any drug store is sold in pills that are 1000 mg each which is over 10 times the RDAs (Recommended Dietary Allowances) from the Institute of Medicine (IOM) of the National Academy of Sciences. There are people who have been taking over 10,000 mg of vitamin C, every day, for years, which is over 100 times the RDA.
So what does vitamin C really do for us. There the data and opinions are at odds. As I said at the beginning we don't know much, if we don't even know or agree what vitamin C does after all these years.
Listed below are the things that have been proven about vitamin C
As an antioxidant, vitamin C scavenges free radicals in the body and protects tissues from oxidative stress.
Vitamin C promotes the absorption of iron, while preventing its oxidation.
Vitamin C is a vital cofactor to the formation of collagen, the connective tissue that supports arterial walls, skin, bones, and teeth.
A major immune-supporting activity of vitamin C is boosting glutathione levels in human lymphocytes, cells that make up about 25% of all white cells in the blood.
More vitamin C is contained in the adrenal glands than any other organ in the body and it is required at higher levels during times of stress.
Listed Below are Things Many Do Not Believe Even Though Major Studies Have Been Done