Beets offer real benefits for blood pressure and exercise, but they're not for everyone. Here's what the science says about this colorful root vegetable.
Sodium copper chlorophyllin is widely used in supplements and food, but is it actually safe? Here's what the research says about side effects and dosage.
Your heart generates its own electrical spark, coordinates a precise wave of contractions, and adjusts its rhythm automatically — here's how it all works.