Clifford et al. 2020, Vitamin C and E and exercise-induced physiological adaptations

Systematic review and meta-analysis of randomised controlled trials (Critical Reviews in Food Science and Nutrition, 60(21):3669–3679; nine aerobic and nine resistance-training trials). Vitamin C and/or E supplementation did not attenuate aerobic exercise-induced improvements in VO₂max or endurance performance, and did not impair lean mass or strength gains from resistance training. The molecular blunting signal seen in individual trials does not translate to a demonstrable whole-body performance loss at the group level. Moderate.