Just make sure it is pharmaceutical grade. At least 99.99% pure or better. You can check it's purity my the temperature it freezes at. Pure DMSO freezes solid like ice at 64 degrees. If it's frozen and you need to use it just put the bottle in a bath of warm water. It original use wa as commercial solvent so it is available in industrial grade.
Just make sure it is pharmaceutical grade. At least 99.99% pure or better. You can check it's purity my the temperature it freezes at. Pure DMSO freezes solid like ice at 64 degrees. If it's frozen and you need to use it just put the bottle in a bath of warm water. It original use wa as commercial solvent so it is available in industrial grade.