Supplements Guide: Side Effects & Best Multivitamins

Vitamins and supplements like melatonin and fish oil offer health benefits but can cause side effects if misused. Learn about the impact of saw palmetto on blood pressure and find the best multivitamins for young women and adults over 50.

Effects of Vitamin D on Blood Thinners

Published Aug,17 2011 | By Debra Wolf

Many people try to better their health by taking supplements. Vitamin D supplementation is a common choice because deficiency is prevalent. In fact, some researchers suggest that half of the people in the world have low blood levels of vitamin D.