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Question:
Some websites are highly critical of magnesium stearate, which is in many supplements. Is this substance toxic and should I avoid it?

Answer:
As you note, magnesium stearate is a commonly used "inactive ingredient" in dietary supplements, but some websites have cautioned that it is potentially "hazardous" and "harmful." The reasons typically given are that magnesium stearate may adversely affect the gastrointestinal tract and the immune system. At the same time, magnesium stearate is generally recognized as safe by the FDA for use in supplements.  So what should you believe? ConsumerLab.com  investigated the facts to help you decide whether or not you should be taking supplements containing magnesium stearate.  See full answer>>

You can also get information about other inactive ingredients in supplements in our report on Inactive Ingredients in Supplements.



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Joe15319   July 24, 2017
Can magnesium stearate cause diarrhea?

ConsumerLab.com   July 24, 2017
Hi Joe -- Diarrhea is not a known side effect of magnesium stearate in the amounts typically used in supplements.

Gavin8399   January 25, 2016
Wonderful information , i have always not known why it was added , without really caring , but with this information i feel very comfortable if it is one of the added ingredients to my supplements

This CL Answer initially posted on 7/13/2012. Last updated 8/8/2017.

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