Lemons have many active compounds that function as antioxidants in the body, including flavonoids, limonoids, kaempferol, quercetin, and ascorbic acid. Lemons have shelf life 60 days. In addition, vitamin C may help wounds heal faster by reducing inflammation and stimulating the production of collagen, an essential protein that aids in wound repair. Besides vitamin C, lemons are also a source of antioxidants that help boost the immune system by protecting against free radical damage.