What are the harmful side effects of eating malic acid?

Malic acid is found in fruits such as apples, animals and in the human body. In fact its structure is related to another structure that is a part of our energy-producing system called the Kreb's cycle. It is thought that if malic acid and magnesium are combined, this combination may help with treating pain and tenderness among those suffering from fibromyalgia. Several studies show mixed results concerning its benefits. It is sold as a supplement but has not been proven in humans to be beneficial. Scientists do not report harmful effects. However, it is recommended that pregnant and lactating women do not take it in its supplement form because scientists do not know its long term effect on the baby.