Endurance athletes are known for taking high doses of Vitamin C to help keep their immune system strong. Vitamin C has been shown to fight free radicals, substances linked to membrane and DNA damage, aging and immune system depression.

Researchers from Spain (published in the American J. of Clinical Nutrition) found that Vitamin C in dosages of 1000mg interfered with the capacity to increase endurance through training. The reason given was that it prevented increases in cell mitochondria and oxygen related enzymes that produce ATP (cells’ major energy source). Endurance training triggers cell processes that help them cope with damaging free radicals. Vitamin C supplements interfered with cellular adaptations that occur with endurance training.

Bottom line. High doses of C and endurance training do not mix because it interferes with training gains.

Who would have thought this?