While injecting is most effective, DMSO has its advantages. First off, you can skip buying the conversion kit and save some time/money. While everyone argues that you lose a lot of tren during the DMSO process it's still worth it and still yields great results. I personally like the feeling of applying the solution pre-workout, you get a nice burn and know it's working. Although I have never personally injected tren, I don't think I ever would. To have a nice low dose/slower gain type cycle and have some DMSO/tren handy to save an extra jab and to have something you can feel working throughout the entire cycle is just nice I think. Hope this helps bro and good luck on yer decision.