Name: Are vitamins and supplements really necessary?
Uploaded: Wed Sep 30 2015 12:15:00 GMT+0000 (UTC)
Duration: 3 min 4 s
Description: New research out Wednesday is casting doubt on the necessity of certain nutritional supplements such as calcium and vitamin D. NBC News medical contributor Dr. Natalie Azar analyzes the findings.

Sept. 30, 201503:04