Methylsulfonylmethane is claimed to help treat certain health conditions such as arthritis, obesity, chronic pain, asthma and allergies. However, there is insufficient medical evidence to support its effectiveness in treating such conditions.
Methylsulfonylmethane contains sulfur, which is known to strengthen joint tissue. Therefore, one possible benefit of methylsulfonylmethane is in the treatment of joint conditions such as tendinitis and sports injuries. However, there is no evidence to support this claim.
On the other hand, there are no studies that have established any toxicity or toxic build-up associated with the use of methylsulfonylmethane. Nevertheless, overuse of the compound can cause nausea, diarrhea or headache.