Muscle Rulz Vitamin C-1000 referred to as L-ascorbic acid, maybe a vitamin. Antioxidant-rich vitamin C is well known for promoting immune function and protecting cells from free radical damage. Vitamin C is additionally a crucial antioxidant that will assist your body with the production of collagen, L-carnitine, certain neurotransmitters, metabolism of protein, and the regeneration of other antioxidants within the body (like vitamin E). Vitamin C is one of the biggest immune system boosters of all. vitamin C may include protection against immune system deficiencies.