IGF-LR3 has no localized effect,.. Its goes systematic no matter where you inject. However I do believe in it for penis growth as I was running it for working out and realized its ability to create new cells and rapidly recover from a workouts. I run HGH as well. (actually has a bunch of benefits). One thing I noticed is no matter how hard I push my body or my penis.. The recovery was amazing. As far as dosing.. People used way too much. 20 to 40 mcg tops for no longer than four weeks at which time you desensitize to it. One worry of injecting in the penis is that most IGF-LR3 is coming from the underground and you can’t be sure of quality or bacteria etc. It is safe to use if properly dosed and can run it again after taking a month or so off. When I say safe is I’ve had no bad effects and havent read much about anyone if dosed correctly. However long term we don’t really know what could come from its use. I prefer abit longer off but thats me. I’m also looking into another peptide that is incredible for recovery and for tendon flexibility which may or may not help with lengthening. BPC-157 and TB-500.both amazing proteins.. All the best in you journeys