99.9% pure DMSO has liquid or solid/crystal state of matter as it has relatively high freezing point at 18.5 °C (65.3 °F), means that at, or below, room temperature it is a solid/crystal, above it is liquid. /In case of crystal state of matter you can put it in wide container or pot with hot water (not boiled) and close it down if possible. The water should not go above the neck of the bottle. After 30-60 min change the water with hot one again. Then keep the bottle in room temperature above the melting point. Or put it on the heater overnight./ DMSO has been used for over 100 years in the United States. It is a natural substance derived from wood pulp and is harmless when used with the proper precautions. DMSO is an organic, colorless, natural, non-synthesized liquid, extracted from lignin. DMSO intended use is as a solvent only and the choice of using it in other applications is the sole responsibility of the user.