Vitamin C is an essential vitamin that can be obtained by eating fruits and vegetables. It's water soluble and impossible to overdose (seriously take as much as you want)!
This essential vitamin is involved in a copious amount of activities in our body, but the most common is immunity. It helps the body resist infections or toxins that it comes into contact with everyday. Basically it protects our body and cells whenever we're weak.
It's the perfect vitamin to supplement when our bodies are under intense stress, such as working out or exercising.