500ml DMSO Liquid 99.9% Pure Pharmaceutical Dimethyl Sulfoxide Grade Solvent99. 9% Pure pharmaceutical Grade DMSO, also known as Dimethyl Sulfoxide. DMSO, or dimethyl sulfoxide, is derived from Pine trees as a byproduct of the paper manufacturing industry. It is also naturally found in garlic as one of the roots 70+ sulfur compounds. It has long been used as a chemical solvent and chemical intermediate for: Non industrial use, including in pesticides and fungicides, veterinary medicines; and for cosmetic use. Domestic use,