Some people are allergic to sulfa drugs, sulfates and sulfites.
People with allergies to sulfa drugs, sulfates and sulfites can take MSM without fear of the allergic reactions they have to those substances. To our knowledge there are no known allergic reactions to MSM and MSM does not react negatively with any known medications. MSM is a nutritional substance, not a drug or medication. Please consult your health care provider before taking any supplement with any medication. And there are no additives.