The main purpose of taking vitamin C while taking the pill is to prevent and alleviate the side effects of the pill on the one hand, and to replenish the excessive consumption of vitamin C in the body on the other. Taking vitamin C along with the pill can prevent this from happening. Vitamin C has strong antioxidant and anti-free radical functions, which can effectively prevent and lighten the formation of pigmentation caused by taking birth control pills. Vitamin C can also effectively relieve nausea, vomiting and other gastrointestinal reactions brought about by the pill, effectively improving gastrointestinal symptoms.