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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 the full answer >>