Q. I'm confused at RDA percentages like 5,000% of B6, 1,650% of B12, 1,500% Vit. C, and so on. Do we absorb all of that or do the excesses just pass in our urine?

A. The large percentages of RDA amounts of vitamins merely reflect the fact that the RDA only expresses the amount needed to prevent a deficiency disease. 65 mg of vitamin C will prevent scurvy, but scurvy is relatively unheard of in developed nations today. Research indicates that an optimal amount is about 2000 mg or 3000% of the RDA amount. That's why we refer to these amounts as ONA (optimal nutritional allowances) in Fantastic Voyage.