I thought "Dumb Questions" would be an appropriate place to ask this. I used Melanotan 2 for the first time in 2013 at 17 years old and it worked magically. It worked for a good 1-2 years, then I stopped using it, went on a holiday and got a bad sunburn and though "why not hop back on"? Well, ever since then, the peptide never worked for me again. I couldn't get that dark tan I wanted, but I got a bit of beard darkening which is weird. Last time I tried MT2 was in 2019, and have had a break until now. I was thinking I may be immune, but is that a thing? I'm probably going to try ordering again after a 4 year break from the stuff, because I initially though my receptors for the stuff were desensitized, hence the long break. I guess if it doesn't work now after such a long break, it may be the case? Has anyone every experienced anything similar? I've seen a few posts on other forums mentioning this.