Vitamin C is great. It is a antioxidant. Mercury is a oxidant. Alot of people get sick off of it, this is probably because it is a great chelator of copper. So those that are copper toxic will get a copper dump symptom. Almost all animals which like the exception of 4 make vitamin C. Scientists think that Vitamin C is actually a hormone more then a vitamin as it is what helps people respond to stress. Aparently somewhere in evolution we lost the ability to make it in our livers, this is also cited for the possible reason for our higher being in the animal kingdom as it will cause raised copper which is a neurotransmiter like mineral.