The Most Popular Supplements: Do They Work?

Here is a look at some of the most popular supplements and what scientific studies show regarding their safety and effectiveness:
Fish oil, omega-3 fatty acids
Source: Fatty fish, such as bluefish, halibut, mackerel provide 2 of 3 fatty acids; the third comes from walnuts, olive oil and flaxseed oil.
Health claim: Mainly prevention of heart disease and related problems.
Does it work?
Several studies offer evidence fish oil reduces heart disease. Evidence is mostly lacking for treatment or prevention of numerous other conditions, such as cancer, mental decline and dementia and arthritis relief.
Some health organizations encourage omega-3 consumption from specific foods or supplements.
Children should not take fish oil capsules.
Side effects: Minimal to none. However, high doses can cause bleeding, especially if used with aspirin and warfarin.
Source material: Agency for Healthcare Research & Quality and NIH Medline Plus
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