I couldn't find my old posts on MSM so here is some fresh info links-
http://en.wikipedia.org/wiki/Methylsulfonylmethane
http://www.msmguide.com/index.html
USES: Methylsulfonylmethane (MSM) has been used for pain and swelling of muscles and joints. Some herbal/diet supplement products have been found to contain possibly harmful impurities/additives. Check with your pharmacist for more details regarding the particular brand you use. The FDA has not reviewed this product for safety or effectiveness. Consult your doctor or pharmacist for more details.
HOW TO USE: Take this product by mouth as directed. Follow all directions on the product package. If you are uncertain about any of the information, consult your doctor or pharmacist. If your condition persists or worsens, or if you think you may have a serious medical problem, seek immediate medical attention.
SIDE EFFECTS: Nausea, diarrhea, or headache may occur. If any of these effects persist or worsen, contact your doctor promptly. An allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include: rash, itching, swelling, dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.
PRECAUTIONS: If you have any of the following health problems, consult your doctor before using this product: any allergies (especially to sulfa). Methylsulfonylmethane is not recommended for use during pregnancy. Consult your doctor before using this product. Because of the potential risk to the infant, breast-feeding while using this product is not recommended. Consult your doctor before breast-feeding.
DRUG INTERACTIONS: Before using this product, tell your doctor or pharmacist of all prescription and nonprescription medications you may use.
http://www.medicinenet.com/methylsul...al/article.htm
http://findarticles.com/p/articles/m...8/ai_111303985
http://pages.prodigy.net/naturedoctor/msm.html
http://www.drugs.com/npp/methylsulfonylmethane-msm.html
from NCBI/pubmed-
http://www.ncbi.nlm.nih.gov/sites/entrez