Kisspeptin-54 vs Bremelanotide
Head-to-head comparison of Kisspeptin-54 (Kisspeptin-54 (metastin), 54-amino-acid KISS1 peptide fragment) and Bremelanotide (Bremelanotide (PT-141), cyclic melanocortin receptor agonist) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Kisspeptin-54 | Bremelanotide |
|---|---|---|
| Category | Sexual Health | Sexual Health |
| Full Name | Kisspeptin-54 (metastin), 54-amino-acid KISS1 peptide fragment | Bremelanotide (PT-141), cyclic melanocortin receptor agonist |
| Molecular Weight | 5.9 kDa | 1025.2 Da |
| Half-Life | about 20-30 min | about 2.7 h |
| Amino Acids | 54 | 7 |
| Typical Dose | 0.3-1.0 nmol/kg | 1.75 mg |
| Route | Intravenous | Subcutaneous |
| Purity | ≥98% | ≥98% |
| Studies Count | 110 | 200 |
| Research Status | Clinical | Clinical |
Kisspeptin-54 Benefits
- ✓GnRH/LH stimulation
- ✓supports sex hormone signaling
- ✓may enhance sexual motivation
- ✓fertility-axis modulation
Bremelanotide Benefits
- ✓increases sexual desire
- ✓supports arousal
- ✓may improve erectile response
- ✓on-demand use
Kisspeptin-54 Dosing
0.3-1.0 nmol/kg IV bolus|single-dose experimental protocols|research-only endocrine monitoring
Bremelanotide Dosing
1.75 mg subcutaneous PRN|administer about 45 minutes before activity|max 1 dose per 24 hours
Kisspeptin-54 Side Effects
- ⚠flushing
- ⚠nausea
- ⚠headache
- ⚠hormonal shifts
Bremelanotide Side Effects
- ⚠nausea
- ⚠flushing
- ⚠headache
- ⚠transient blood pressure increase
Research Overview
Kisspeptin-54
Human studies show that kisspeptin-54 can acutely modulate reproductive neuroendocrine signaling, which makes it relevant to libido and sexual motivation research. Its effects are indirect compared with PT-141, but it is a well-established peptide in the scientific literature.
Bremelanotide
Human studies and approval data support meaningful effects on sexual desire in women, with a central mechanism involving melanocortin signaling. It is one of the most clinically relevant peptides in this category and is commonly used as the reference compound for PT-141-type research.
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