The 4 oz bottle is PLENTY enough.
I've tried both. DMSO seemed easy enough at first. The only side was garlic breath for several hours. But then 2 weeks in, the skin couldnt handle it anymore. I started itching and getting rashes and peeling. And yes I did rotate, elbows, wrists, ankles, waiste. So then I cooked the rest and shot it.
My advice is shoot it.