Evening primrose oil (EPO) is often used to regulate hormone balance, relieve premenstrual syndrome (PMS) and improve skin health. It can be used to blend base oils and essential oils, has multiple therapeutic and whitening functions, and can be made into capsules for oral administration to treat cardiovascular disease, premenstrual syndrome, and menopausal syndrome. It can be used in aromatherapy to blend lotions and creams, improve eczema, psoriasis, help wound healing, nail development, and solve hair problems.