Re: Melatonin 2 in pct to improve libido.
I assume you mean "Melanotan" rather than "Melatonin"?
Dosing Melanotan II that high can result in undesirable effects.
Darkening around the eyes for one., Fatigue/nausea is another.
I would continue with a lower dose and wait to see if you get the effect that you are looking for.
As I stated previously, you may not get any improvement in libido from Melanotan; this effect is subjective.
Ignorance: Reassuringly Expensive.