Training hard and often can stress your body. It can also contribute to oxidative stress, which has the potential to damage cells. Would supplementing with an anti-oxidant like cranberry extract help? A study published in the Journal of the International Society of Sports Nutrition had national level rowers supplement with 1,200 mg of cranberry extract daily for 6 weeks.
Before and after the supplementation period, 16 subjects performed a 2,000 meter test on a rowing ergometer. Blood samples were taken one minute after each exercise test and 24 hours into recovery. Compared to subjects who received a placebo, cranberry extra supplementation strengthened antioxidant potential. But it didn’t have any effect on inflammation or iron metabolism.