What it does: Your body converts beta-carotene into vitamin A. This vitamin works as a skin barrier against discoloration, inflammation, and clogged pores, often caused by free radicals. Retinol is a key ingredient in many beauty products as it fights against hyperpigmentation, acne, fine lines, and scarring. Instead of buying expensive creams, you can enjoy the original form of retinol by adding sweet potatoes to your meals.