What are the side effects of too much vitamin c besides yellow pee?

More not nec better: There often seems to be this belief that if vitamin c (or any other herb, supplement, vitamin) is good for you, more is better. Firstly most of these probably have no benefit. Excess of them, certainly have a downside, in particular the lipid soluble vitamins (such as a, d, e, and k), which stay for long periods of time in the fat cells of the body (like thc). Diseases such as hypervitaminosis a.

Mineral deficiencies: Mega dose vitamin c can actually be dangerous. It is true that vitamin c is water soluble & you will excrete any vitamin c that you don't use. However, in order to excrete vitamin c in your urine, you must also excrete minerals as well. Therefore, excess vitamin c can lead to mineral deficiencies, especially a copper deficiency. Be very cautious in megadosing any vitamin or mineral or amino acid.