.50mg a day of Melanotan 2 makes me feel great.
If I don't want to get any darker from the tanning effect, .30mg PT-141 is a close second.
MT-2 is known for its tanning and PT-141 for intense libido, but they both have significant mood and energy boosting effects on par with potent anti-depressants in my experience, and have been looked at for treating a number of psychological conditions.
The both have mild digestion related sides shortly after injecting, but with repeated use those lessen and eventually go away completely, Neither ever messes with my gut no matter what the dose now.