PT-141 lol
But besides low-dose, temporary use of MT-2, PT-141, and the like for the more primitive part of the brain (hypothalamus), there are more targeted peptides for mood, cognition, etc. Like Selank, Semax, and PT-22-28. Or that's the theory anyway.
For an energy boost, there are various peptides like SS-31 and also stimulants like caffeine.
On the traditional medication side, Wellbutrin\buproprion is good for some since it can also help in a minor way with weight loss or at least energy as a stimulating anti-depressant (with low incidence of sexual side effects, about the same as placebo). On the hormonal side, there is TRT/HRT for a boost.