you probably need to inject a few hours before a workout as it would probably have a short half life and an immediate effect on performance...not sure about how often you need to inject it though...hopefully someone else can shed some light on that.
Technically speaking it shouldnt hurt as bad as water based suspension as oil never does...
Heard Some awesome shit about it but havnt tried it myself. Have some buds that take it pre workout and say it's the best pre workout supp ever. They basically live in the gym after taking it. They only take .5 cc before workout.
Most people do not believe that spot injecting works, but if it does, then yes it would be with aas such as tne, suspension, or even injectable winstrol that have very short or no esters.