Dimethyl Sulfoxide (DMSO) isn't taken orally for treatment of parasites. It's an old-fashioned horse linament used as a pain reliever & booster of topical products.
The feds banned its sale in drugstores because the medical mafia wanted to push their expensive Rx's instead of this cheap & marvelous pain relief product.
See below for purchasing info & other topical skin treatments:
Dimethyl Sulfoxide (DMSO): Roll-on, gel, liquid, & cream. Super pain relief for skin, tissue, joints, & muscles. Mix together with or apply over other products. Use as a "carrier" for deep penetration of creams, oils, ointments, & parasite meds into skin & soft tissue. Available online or local tractor/farm/feed stores only. At E-Bay, enter in search box for all categories: (Dimethyl Sulfoxide,DMSO)
Topical parasite treatments for skin, scalp, & soft tissue: