Fish oil supplements contain omega-3 fatty acids from "fatty" fish, which may include mackerel, herring, tuna, halibut, salmon, cod liver and whale or seal blubber. There is some evidence that using fish oil supplements for a long time may lead to vitamin E deficiency, so small amounts of vitamin E are sometimes added to fish oil supplements, which also helps to prevent spoilage. In some products, other nutrients are added, including calcium, iron and vitamins A, B1, B2, B3, C and/or D.
Some fish oil supplements have been shown to help lower high triglyceride blood levels. There is some evidence they may be helpful for a long list of other conditions as well, but talk to your doctor before taking fish oil supplements. In some cases, they can cause side effects ranging from bad breath to problems with excessive bleeding.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.