It's BS. Don't waste your time with it....it does nothing for spot reduction. It's up there with the "HCG diet", IMHO. Just take oral clen and yohimburn ES topically.
Injecting yohimbine is going to give good uptake but its also going to go systemic pretty much immediately, therefore such injections are going to have a very minimal effect. Also, injecting clen can cause tissue apoptosis, and that will be muscle....not fat.
Clen has near 100% oral bioavailability, there is no reason to inject it. Just be careful with your dosing of clen, used wrong and it can cause some serious problems.