... its use.4.MSM is also used for relief of allergies, chronic constipation, “sour stomach,” ulcers, a ... erythematous), HIV infection and AIDS, and cancer (breast cancer and colon cancer).6.Other uses of MSM include eye inflammation, mucous membrane ... , leg cramps, migraine, headaches, hangover, parasitic infections of the intestinal and urogenital tracts including Trichomonas vaginalis and Giardia ...