MSM is relatively volatile and dissipates easily upon heating or prolonged storage. Breast milk is the richest natural source of MSM. MSM needed for life on Earth The importance of MSM for life on Earth is great. Without MSM, life on Earth as we know it would not exist. MSM is formed in nature as part of the terrestrial sulfur cycle: algae and vegetable plankton in the oceans massively absorb inorganic sulfur from seawater and convert it into simple organic form. When algae and plankton die, enzymes cause the organic sulfur compounds to break down into dimethyl sulfide (DMS). This substance is volatile and does not dissolve well in water. It therefore collects high in the atmosphere, where it is converted under the influence of ultraviolet light and ozone into dimethylsulfoxide (DMSO) and further into methylsulfonylmethane (MSM). DMSO and MSM are readily soluble in water. They form the condensation nuclei necessary for the formation of raindrops. Without DMSO and MSM in the sky, there will be no clouds and no rain. Roots of trees and plants are able to absorb DMSO and MSM from rainwater quickly and efficiently.