DESCRIPTION
 
Pure ascorbic acid, USP grade, in powder form. An antioxidant for the maintenance of good health. Helps in the development and maintenance of bones, cartilage, teeth, and gums. It also helps the body to metabolize fats and proteins.
 
Did you know that vitamin C isn’t essential to all animals? However, it is for us, humans. It isn’t a necessary component of diet, at least for all mammals with the exception of guinea pigs, fruit eating bats, the red-vented bulbul bird, and primates—which includes us. All other species make their own.
They do this by converting glucuronic acid derived from glucose into ascorbic acid (C₆H₈O₆). Three enzymes are required to make this conversion; one of these enzymes, or part of the enzyme system, is missing in primates. Irwin Stone proposed, in 1965, that a negative mutation may have occurred in these species so as to lose the ability to produce vitamin C. In primates, this is thought to have occurred in the region of 25 million years ago.
Unlike other vitamins, vitamin C is required in large amounts, which could only be supplied by a tropical diet high in fruit and other vegetation. If sufficient vitamin C could be obtained from such a diet, the quantity of glucose normally used to synthesize vitamin C could be channelled towards energy production. This could conceivably have been an advantage for primates or other species.
Dr. Jungblut, an early pioneer of vitamin C therapy in the 1930s, discovered that only we primates and guinea pigs were susceptible to scurvy as well as anaphylactic shock, pulmonary tuberculosis, diphtheritic intoxication, a poliomyelitis-like viral infection, and a viral form of leukemia; none of the vitamin C–synthesizing laboratory animals had susceptibility to these diseases. This is perhaps one of the first observations that led to the idea that susceptibility to viral infections could be a consequence of vitamin C deficiency.
The fact that almost all species continue to make vitamin C suggests that the amount of vitamin C generally available from the diet is not enough for optimum nutrition, except in exceptional circumstances such as a tropical environment. Under normal circumstances, the daily amount produced, adjusted for comparison to a 70 kg man, is somewhere between 3 000 mg and 15 000 mg, with an average of 5 400 mg.
While a mere 60 mg a day can prevent scurvy, the deficiency disease first identified by Dr. James Lind in 1753, it would be illogical to assume that this is the optimal dose. A survey of doctors in the US found that those who were healthiest consumed at least 250 mg of vitamin C per day. A recent survey has shown that a person’s vitamin status is a good predictor of their mortality risk. High blood vitamin C levels indicate a low risk for cardiovascular disease as well as for certain types of cancer and other immune based diseases. Optimal intakes to reduce risk of such conditions would appear to be at least 500 mg per day.
But aren’t you simply making expensive urine when you take large amounts of supplements? Dr. Michael Colgan investigated this often-made rebuttal. He investigated how much vitamin C we use by giving increasing daily doses and measuring excretion. Only a quarter of the subjects reached their vitamin C maximum at 1 500 mg a day; more than half required over 2 500 mg a day to reach a level where their body could use no more. Four subjects di