Are there any safety concerns or contraindications for MSM?
A. MSM is thought to be safe and nontoxic. There are no known contrindications. MSM should be avoided by pregnant women and nursing mothers due to lack of studies. It is generally believed that people who are allergic to sulfa drugs or do not tolerate sulfite preservatives in foods need not be concerned about the use of MSM and glucosamine sulfate–that these do not give rise to allergic reactions. However, there are reports of individulas who are reactive, so caution is advised.
