Peptides are suddenly a buzzword in the media and amongst certain wellness-minded circles, promising to help people sleep better, look better, lose weight, gain strength, reduce inflammation, and perhaps prevent disease. But without medical-grade testing to back up these claims, are they safe to use? Dr. Amanda Kahn runs a medical practice devoted to longevity medicine and joins Martha today to break down the costs, risks and science behind the peptides and enzymes she prescribes.