Vitamin C and E blunts endurance training benefits

Taking vitamin C and E supplements could blunt endurance training induced augmentation of certain mitochondrial proteins, according to a study published in the Journal of Physiology. Taking these antioxidants could interfere with the process of exercise-induced muscular reactions and endurance.                                                                             

Vitamin C and E increase oxygen demand in the muscles and reduce endurance training benefits. 

The present study involved several participants who were assigned to receive either 1000 mg of vitamin C with 235 mg of vitamin E or a placebo. No significant differences in performance were observed. However, muscular biopsy has suggested lack of oxygen supply in certain muscles among vitamins-supplemented participants.