While far from robust, there is enough epidemiological, laboratory and clinical evidence to suggest that omega-3 fatty acids may play a role in certain cases of depression. Fish oil supplements are well tolerated, and have been shown to be without significant side effects over large scale, 3-year research. Generally, omega-3 supplements are inexpensive, which makes them an attractive option as an adjuvant to standard care.
Multiple human trials report small reductions in blood pressure with intake of omega-3 fatty acids. DHA, or docosahexaenoic acid, may have greater benefits than EPA, or eicosapentaenoic acid. There is strong scientific evidence from human trials that omega-3 fatty acids from fish or fish oil supplements significantly reduce cholesterol levels, which may also help patients with hypertension.
Dangers and possible side effects...
Avoid if allergic or hypersensitive to fish, omega-3 fatty acid products that come from fish, nuts, or linolenic acid or omega-3 fatty acid products that come from nuts. Avoid during active bleeding. Use cautiously with bleeding disorders, diabetes, low blood pressure or drugs, herbs or supplements that treat any such conditions. Use cautiously before surgery. Recommended that intake be limited in pregnant/nursing women to a single 6-ounce meal per week, and in young children to less than 2 ounces per week.
References:
1. Natural Standard- The Authority on Integrative Medicines- Omega 3 Fish oils