Should you take a supplement for heart health? Here’s what the science says. The Washington PostDon’t take over-the-counter fish oil supplements for your heart, joints or depression, science says Genetic Literacy ProjectFish or Vegan Omega-3? Does quality, source and science matter more than you think? Green ProphetSupplements like fish oil, coenzyme Q10, and magnesium are often marketed for their supposed cardiovascular benefits, including heart attack prevention. But experts say most of these claims lack scientific backing. Facebook