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Peptide Therapy GuideClear peptide education

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Peptides for HSDD Research: Mechanism Comparison

Kisspeptin-54 (full-length) GPR54 (KISS1R) <30 minutes Poor (requires ICV) Modeling pulsatile GnRH secretion and HPG axis restoration Gold standard for upstream hormonal models but impractical for sustained-release or peripheral administration Kisspeptin-10 (t

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  • Kisspeptin-54 (full-length)
  • GPR54 (KISS1R)
  • <30 minutes
  • Poor (requires ICV)
  • Modeling pulsatile GnRH secretion and HPG axis restoration
  • Gold standard for upstream hormonal models but impractical for sustained-release or peripheral administration
  • Kisspeptin-10 (truncated)
  • 90–120 minutes
  • Extended GPR54 stimulation without rapid degradation
  • Longer half-life makes it better for multi-hour assays, but CNS delivery still requires direct administration
  • Bremelanotide (PT-141)
  • MC4R (selective)
  • 2.7 hours
  • Moderate (crosses BBB after SC injection)
  • Central arousal pathway modeling and behavioral assays
  • Only FDA-approved peptide for HSDD; works peripherally with central effects, making it ideal for non-invasive dosing models
  • Melanotan II
  • MC3R, MC4R, MC5R (non-selective)
  • 33 minutes
  • High (lipophilic, crosses BBB readily)
  • Broad melanocortin system research (not HSDD-specific due to MC3R agonism)
  • Potent but non-selective. Useful for melanocortin receptor mapping but not for isolated arousal pathway studies
  • Oxytocin (endogenous)
  • OXTR
  • 3–5 minutes
  • Very poor (<0.01% after peripheral admin)
  • Pair-bonding and limbic reward circuit studies (requires intranasal or ICV)
  • Effective only via intranasal or direct CNS routes; peripheral administration doesn't produce central effects
  • Carbetocin (oxytocin analog)
  • 85–100 minutes
  • Poor (peripheral admin shows weak CNS effects)
  • Sustained oxytocin receptor stimulation without repeated dosing
  • Longer-acting than oxytocin but still limited by BBB penetration. Intranasal preferred over SC/IV

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