For healthy adults, 3 grams or less of omega-3 fatty acids from supplements per day is recommended, according to University of Maryland Medical Center. Taking a higher dose than this can increase the risk of bleeding. No daily dose of omega-3 fatty acids is available for children.
Omega-3 fatty acids can also come from food sources, such as catfish, salmon, albacore tuna, striped sea bass and halibut, according to Mayo Clinic. Healthy adults with no known medical conditions should eat fish at least twice a week to meet recommended dietary intakes of omega-3 fatty acids. Taking omega-3 fish oil supplements can interfere with blood thinning and diabetic medications, warns UMMC.