The immune function angle is the famous one, and it's real. Vitamin C enhances the function of white blood cells including neutrophils, T cells and phagocytes, and supports cytokine signalling so your immune system can actually respond properly when it needs to. Research shows it reduces the duration and severity of respiratory infections, particularly in people under high physical stress or heavy training loads.
But immune support is only the beginning.
Vitamin C is essential for collagen synthesis. Collagen is the primary structural protein in your skin, bones, cartilage, tendons and blood vessels. Without enough Vitamin C, collagen production is impaired, which affects joint integrity, tissue repair, recovery from training and skin health. If you're training hard and wondering why recovery feels slow or your joints feel off, Vitamin C status is worth looking at.
It's a powerful antioxidant too. Exercise generates oxidative stress, free radicals that contribute to inflammation, fatigue and cellular damage. Vitamin C neutralises them and also supports other antioxidant systems including Vitamin E and glutathione. Less oxidative stress means less inflammation, faster recovery and a body that can handle repeated training sessions without falling apart.