Summarize this article in one sentence.
Avoid multivitamins containing extra iron unless you need it, because extra iron may lead to constipation. Omega-3 fatty acids such as those found in fish, nuts and seeds have been shown to improve heart health, to prevent atherosclerosis and stroke, and to lower blood pressure. Omega-3 supplements, such as fish oil capsules may also have positive effects for disorders such as depression.

Summary:
Take a daily multivitamin. Take an omega-3 supplement. Take a Vitamin D supplement to strengthen bones and to prevent cardiovascular disease, certain cancers and autoimmune diseases. Take an additional calcium supplement if you are a woman.