MSM is a naturally-occurring nutrient, a sulfur compound, found in normal human diets and the diets of all other vertebrates. Sulfur is an element present in all living organisms. It belongs in the same chemical family which includes oxygen. For organisms living in environments where there is no oxygen, sulfur often replaces oxygen as the source of chemical energy that drives life. It is not a pharmaceutical drug but a dietary supplement.
Sulfur, the eighth most abundant...