Be VERY CAREFUL with injecting Oxytocin. I've been trying all sorts of peptides, including oxytocin, chasing an erection. If you inject too much, you will feel like absolute DOGSHIT. You'll get incredibly hot, and feel absolutely awful. Thankfully the half life is very short so it goes away fairly quickly, within an hour, but I couldn't find a dose whereby I either felt like shit or felt absolutely nothing. PT 141 seems to be the best for me and giving me erections, no matter what my testosterone, estrogen, or any other numbers are, it always causes constant erections for me. Unfortunately, I still go limp and have ED issues, but I get a hard on back fairly quickly, even after climaxing. I can get off and usually within 5 minutes, I'm having rock hard erections again. I can only imagine how good this peptide could work if I had all my numbers in line and had no ED issues whatsoever.