The Sea Buckthorn seed or berry oil is used as an expectorant for loosening phlegm; for treating asthma, heart disorders including chest pain (angina) and high cholesterol; for preventing blood vessel disease; and as an antioxidant. Sea buckthorn oil is also used for slowing the decline of thinking skills with age; reducing illness due to cancer, as well as limiting the toxicity of chemical cancer treatment (chemotherapy); balancing the immune system; treating stomach and intestinal diseases including ulcers and reflux esophagitis (GERD); treating night blindness and dry eye; and as a supplemental source of vitamins C, A, and E, beta-carotene, minerals, amino acids, and fatty acids.