Monarch butterflies use medicinal plants to treat their offspring for disease, before they even hatch, a new study finds.
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.
A study finds herbal remedies may do more harm than good for some patients. NBC's Leanne Gregg reports.