Monarch butterflies self-medicate offspring

Monarch butterflies use medicinal plants to treat their offspring for disease, before they even hatch, a new study finds. Full story

GAO offers dose of caution on supplements

  The Government Accountability Office says sellers of herbal supplements often cross the line with deceptive marketing of their products. NBC’s Kelly O’Donnell reports and Dr. Nancy Snyderman weighs in on the report.

Study warns of herbal remedy risks

  A study finds herbal remedies may do more harm than good for some patients. NBC's Leanne Gregg reports.