C-peptide vs Kisspeptin-54
Head-to-head comparison of C-peptide (Connecting peptide (C-peptide)) and Kisspeptin-54 (Kisspeptin-54 (metastin), 54-amino-acid KISS1 peptide fragment) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | C-peptide | Kisspeptin-54 |
|---|---|---|
| Category | Pain Management | Sexual Health |
| Full Name | Connecting peptide (C-peptide) | Kisspeptin-54 (metastin), 54-amino-acid KISS1 peptide fragment |
| Molecular Weight | 3020.3 Da | 5.9 kDa |
| Half-Life | ~20-30 min | about 20-30 min |
| Amino Acids | 31 | 54 |
| Typical Dose | no approved analgesic dose|research-only | 0.3-1.0 nmol/kg |
| Route | IV|subQ | Intravenous |
| Purity | ≥98% | ≥98% |
| Studies Count | 46 | 110 |
| Research Status | Pre-clinical | Clinical |
C-peptide Benefits
- ✓diabetic neuropathy research
- ✓nerve function support
- ✓possible analgesic effect
Kisspeptin-54 Benefits
- ✓GnRH/LH stimulation
- ✓supports sex hormone signaling
- ✓may enhance sexual motivation
- ✓fertility-axis modulation
C-peptide Dosing
0.5-1.0 mg/day in research|route varies by protocol
Kisspeptin-54 Dosing
0.3-1.0 nmol/kg IV bolus|single-dose experimental protocols|research-only endocrine monitoring
C-peptide Side Effects
- ⚠injection-site reactions
- ⚠unknown long-term safety
Kisspeptin-54 Side Effects
- ⚠flushing
- ⚠nausea
- ⚠headache
- ⚠hormonal shifts
Research Overview
C-peptide
C-peptide is not an approved analgesic, but multiple studies have examined its effects on peripheral nerve blood flow and neuropathy outcomes. The strongest relevance is in diabetic neuropathic pain rather than migraine.
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.
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