Your gums are made up partially of collagen, which is why they tend to be more sensitive when your vitamin C levels dip. They can bleed more, as well, and since vitamin C helps with wound healing, a deficiency means that bleeding gums won’t heal as quickly. Swollen gums are a result of inflammation, a process that vitamin C helps prevent as an antioxidant. Adequate vitamin C intake has been shown to be beneficial in improving gum health and reducing gum inflammation.