Vitamin C (ascorbic acid) is a key antioxidant that helps protect our cells from free radical damage. It also aids in the production of cellular energy, promotes wound healing, and helps increase immunity. Due to this product’s antioxidant effects, this product should be avoided 1 week before, during, and for 4 weeks after radiation.
 
References:
Vitamin C and Immune Function
 
Two Faces of Vitamin C: Antioxidative and Pro-Oxidative Agent