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.

When Is Fish Oil Rancid?

Published Jul,08 2011 | By Stephanie Crumley Hill

Many people take fish oil supplements for their health. When it is fresh, fish oil is a healthy source of omega-3 fatty acids. But like any other oil, fish oil can spoil and become rancid. Rancid oils are harmful to the body and taste unpleasant, so you should not ingest them.