Sexual dysfunction (libido, arousal)
Reduced libido or arousal, independent of testosterone levels — applies to both sexes.
What changes during this transition
PT-141 (bremelanotide) is the most direct library entry — FDA-approved (Vyleesi) for hypoactive sexual desire disorder in premenopausal women, off-label in men. Acts via melanocortin receptors in the CNS rather than vascular pathways, so it works independent of erectile-physiology issues. Oxytocin has a documented role in arousal and bonding, with off-label use for libido. Kisspeptin via the HPG axis affects libido indirectly through testosterone. Note that libido issues are often multifactorial — relationship dynamics, stress, sleep, and medication side effects (SSRIs especially) account for a large share.
Important caveat
Don't conflate libido with erectile function — they have distinct biology. Erectile dysfunction with adequate libido suggests vascular workup. Libido changes after starting a new medication (especially SSRI / SNRI antidepressants, beta blockers, finasteride) should prompt review of that medication before adding peptides.
Peptides editorially relevant to sexual dysfunction (libido, arousal)
3 peptides from the library — each evidence-tiered honestly.
- PT-141 (Bremelanotide)Tier 1
Melanocortin receptor agonist
FDA-approved as Vyleesi for premenopausal HSDD. Off-label use for male erectile function and on-demand libido is widespread but supported by far thinner evidence.
- OxytocinTier 1
Posterior-pituitary neuropeptide
The labor-induction hormone (Pitocin), FDA-approved since 1962. Off-label nasal and subcutaneous use — for autism social cognition, 'bonding,' anxiolysis — has loud community framing but a messier and partly negative randomized-trial literature.
- KisspeptinTier 2
KISS1R agonist (hypothalamic neuropeptide)
Sits at the very top of the reproductive axis — triggers the cascade that produces sex hormones. Strong clinical-research evidence for hypogonadism and IVF use; off-label 'natural T' community use in healthy men runs ahead of the data.
Want this list to grow? The library is editorial — if there’s a peptide you think belongs on this page with documented or mechanistically-clear evidence, send us a note with the citation and we’ll review it under the same evidence-tier discipline as every other entry.