I actually found out about PT - 141 because I purchased Melanotan 2 so I could catch a good tan. The first time I took it, I started getting unbelievable boners non-stop. I started reading up on it and found out that erections are a major side effect of it, along with headaches, uncontrollable yawning and stretching. I got all of them, and an incredible "tan". But the side effect of "constantly stretching" and yawning were almost unbearable. I then came across PT-141 which is nearly identical, minus the "tan", and decided to try it. I find it works FANTASTIC for erections, though takes slightly longer to kick in, but I don't get as extreme side effects, the yawning & stretching. I know that sounds like weird side effects but if you take a higher dose, you'll quickly find out what I'm describing. Anyway, it comes in a freeze dried powder in a small vial. You can mix either 1 CC or 2 CC's of bacteriostatic water into the vial. NEVER allow it to quickly shoot in, directly on the white, freeze dried powder. Make sure you are holding the plunger on your syringe loaded with 1 or 2 CC's of bacteriostatic water. Then put the needle in pointed towards the side of the inside vial and SLOWLY allow the suction to pull the water in down the side of the vial. Once it's empty, DO NOT shake, or turn over the vial. Simply rotate the vial in a small circle and the solution will quickly mix. These peptides are fragile and can be destroyed or become less potent if you don't mix them properly. Anyway, after it's mixed, depending upon whether you used 1 CC or 2 CC's of water, I would start out with 2.5 IU's for 1 CC of water or 5 IU's for 2 CC's of water. Inject it sub Q 2 inches from your belly button about 60 - 90 minutes prior to sexual activity. It works for so long that you can inject 4 - 6 hours prior and it will still work for another 30+ hours. I normally do double those doses, or 5 IU's for 1 CC or 10 IU's for 2 CC's, but I would recommend starting off lower and working your way up based on how it affects you. Everyone is different. My wife & GF can't believe the results. Take that with Cialis and I have "skin stretched" rock hard boners non fukin stop. I climax and within 5 minutes, I'm rock hard again. It's crazy. The morning wood the following morning is INSANE. I also find the it has a "stimulant" effect on me whereby I find it difficult to get quality sleep when I take it. After a marathon session, we fall asleep and I find myself constantly moving, rolling over, and getting hard ons all night long. I'm not sure if most guys have similar results, but for me anyway, this shit works no matter what. Crashed Estrogen and completely unable to get hard, even with 20 MG's of Cialis. Take PT 141 and I'm getting boners all night long. Shits crazy.