DHA is an essential fatty acid that comes from fish oil. DHA is used to treat aggression, cancer, dementia, atopic dermatitis (itchy skin), gingivitis (swollen gums), high colesterol and high triglycerides (blood fats), inflammatory bowel disease, lupus, rheumatoid arthritis, inflammation (pain and swelling), multiple sclerosis, psoriasis, brain development in infants, and high bllod preassure. Other names for DHA include: Docosahexaenoic Acid, Omega-3 Fatty Acid and Fish Oil. Check with your doctor before taking DHA