Coffee alone is a source of nutrients and antioxidants that may benefit the skin, scalp, and hair. Use it to exfoliate, treat acne, increase blood flow, and balance pH levels. The substances in coffee also help to promote healthy skin. Caffeic acid, an antioxidant, may boost collagen levels and reduce the premature aging of cells. Caffeic acid also has antimicrobial properties, which means that it may help protect the skin against germs.