According to then 99 year old Theodore P. Jorgensen. He is the man that highly recommends ascorbic acid for everybody.
It was also discovered that most animals produced there own ascorbic acid, but human beings, apes, monkeys, and guinea pigs, could not make any at all.
The conclusion of the thinking on this problem was that the animals which could not make ascorbic acid had a genetic defect involving one enzyme which was lost millions of years ago because ascorbic acid was so easy to be obtained in the food then available.