Absolutely! Malic acid is a biochemical found mostly in apples and it supports the Krebs energy cycle. Studies show it also helps fibromyalgia and chronic fatigue (ME/SEID), conditions which are low in energy. For these reasons, we added 600 mg of malic acid to our Multi-Gold (CODE 104), a premium multi-vitamin-mineral complex. Although the name implies an acidic nature, malic acid is very mild like apple juice so it will not upset your stomach. You'll find articles on both Multi-Gold and Malic Acid in our Health Library. Thanks for the question, Peggy!