Vitamin C is crucial for the production of neurotransmitters in the brain, such as dopamine, norepinephrine, and adrenaline. It is therefore essential for proper brain function. Furthermore, its ability to fight oxidation could help delay the onset of neurodegenerative diseases, such as Alzheimer's disease. The vitamin C transport system in the brain also plays a role in the development of degenerative diseases, making it a potential treatment option.

Vitamin C possesses powerful antioxidant properties. When combined with other antioxidant molecules such as vitamin E, selenium, and zinc, it neutralizes excess free radicals in the body. Thus, ascorbic acid protects against oxidative stress and premature cellular aging. This antioxidant action also helps protect the body against various pathologies, including cancer, cardiovascular disease, and neurodegenerative disorders.

Vitamin C concentrations are particularly high in the cells responsible for the body's immune defenses. It contributes to the production and renewal of white blood cells, helping the body protect itself against internal and external pathogens.