„Vitamin C supplementation attenuates the oxidative stress (lipid peroxidation) and inflammatory response (IL-6) to a single bout of exercise.“[1]

Vitamin C is essential and gets consumed by the body and needs to be replenished. For example during sickness the Vitamin C consumption is higher which could lead quickly to low levels.

1. https://pubmed.ncbi.nlm.nih.gov/32162041/