High doses Too much vitamin C: Is it harmful? - Mayo Clinic 65 to 90 milligrams 65 to 90 milligrams fruits and vegetables mayoclinic.org Mayo Clinic Too much vitamin C: Is it harmful? - Mayo Clinic 65 to 90 milligrams Too much vitamin C mayoclinic.org Too much vitamin C 65 to 90 milligrams www.mayoclinic.org the extra is just flushed through your body unnoticed Mayo Clinic 65 to 90 milligrams Is It Possible To Take Too Much Vitamin C?