Vitamin C And E Supplementation Hinders Endurance During Athletic Training

Although it’s probably too late to help the Olympic athletes at Sochi, a finding by Norwegian researchers about the negative impact of vitamin E and C supplementation on endurance could help future competitors. An 11-week clinical study involved 54 young and healthy men and women randomly assigned to take vitamin C or vitamin E supplements, or a placebo. The participants were monitored closely as they took part in an endurance training program, mostly running. The study found that the vitamin C and E supplements seemed to blunt the improvement of muscle endurance by disrupting cellular adaptations in exercised muscles.