While there are no known negative side effects from taking too much vitamin C, some experts recommend limiting intake to between 1,000 and 2,000 mg per day. If you take more than that, you may notice an unpleasant metallic taste in your mouth.
The recommended daily allowance (RDA) for vitamin C is 90 milligrams per day for adults. Vitamin C deficiency rarely occurs in healthy people. The absence of Vitamin C in the daily diet can cause scurvy in the long run. Scurvy is a disease caused by a lack of vitamin C in the body. Symptoms include bleeding gums, fatigue, and poor wound healing.