Here's a great article on Omega-3 Fish Oil supplements from the NYTimes. DHA from the fish oil helps the brain function and supports a healthy heart.
From the article: "Most health care providers suggest 1,000 milligrams of combined DHA and EPA daily for a child, and up to 2,000 milligrams for an adult, but they say they adjust the amounts depending on weight. Some experts recommend higher doses to get the full therapeutic effect, but there are risks."
Some brands at health food stores have a flaxseed oil blend (less expensive), but studies show the fish oil has better absorption by the body. Fish oil supplements are under strict review to be mercury-free and most companies adhere to stricter European standards. Here's a brand with superior potency power. If you were recommended to take 3000 mg by your doctor, you'd only have to take 4 capsules instead of 6 from other brands. Plus, you get the power of Vitamin E to assist in your absorption of this fish oil.
You can get other heart healthy monounsaturated fats from nuts like walnuts, macadamia, pecans, cashews, almonds, and pine nuts. Avocados are not only good for your heart but get raves for improving hair and skin!