A lot of unresearched questions you just asked there.
Have you read the MT-II guide by chance?
http://melanotan.org/cgi-bin/yabb/Ya...num=1187046600
http://melanotan.org/cgi-bin/yabb/Ya...num=1161830553
If you purchased 50mg for mainly libido, I really think you bought the wrong product. A lot goes into this stuff and these are very difficult questions to answer. From issues like GI track irritation and pigmentation...the sides could get complicated. Timing is key with those peptides too, takes some trial and error. Please let us know what you think and how your research goes though!