Dr. Oz investigates how illegal ingredients end up in your health supplements. Learn the warning signs of dangerous, spiked supplements so that you can protect yourself. 

Click here for Part 1 of Supplement Safety Guide.

Click here for comprehensive guidelines for purchasing safe supplements.

Want to help lower your risk of getting cancer? The answer could be in the food you eat! Dr. John Whyte, chief medical officer at WebMD and the author of "Take Control of Your Cancer Risk," says there are three kinds of foods that could really help prevent cancer: garlic, fish and grapes. And what three kinds of foods should you avoid? Red and processed meats, refined grains, and alcoholic and sugary drinks. Watch the videos below to learn more about how food could be connected to your cancer risk.