Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Kisspeptin-10 | Sermorelin | |
|---|---|---|
| Category | Peptides | Peptides |
| Standard Dose | Research indicates 1-10 mcg/kg via subcutaneous injection or IV bolus for acute HPG axis stimulation. | Research indicates 200-300 mcg administered once daily at bedtime via subcutaneous injection. |
| Timing | Morning dosing preferred for testosterone optimization. Can be used acutely before sexual activity. | Bedtime administration (aligns with natural nocturnal GH release). On empty stomach. |
| Cycle Duration | Short-term use only. Continuous kisspeptin administration may cause tachyphylaxis (desensitization) of the HPG axis. | 12-24 week cycles. Some protocols use continuous treatment. |
| Evidence Level | moderate_human | strong_human |
Kisspeptin-10 is the 10-amino acid C-terminal fragment of the kisspeptin family that signals directly to GnRH neurons through the kisspeptin receptor (KISS1R/GPR54), triggering GnRH release into the portal circulation. This stimulates LH and FSH secretion from anterior pituitary gonadotrophs. In men, intravenous kisspeptin-10 produces rapid dose-dependent LH rises (4.1 to 12.4 IU/L at 1 mcg/kg within 30 minutes), increases LH pulse frequency and amplitude, and subsequently elevates testosterone through the HPG axis.
Research indicates 1-10 mcg/kg via subcutaneous injection or IV bolus for acute HPG axis stimulation.
Morning dosing preferred for testosterone optimization. Can be used acutely before sexual activity.
Short-term use only. Continuous kisspeptin administration may cause tachyphylaxis (desensitization) of the HPG axis.
Sermorelin is a synthetic 29-amino acid peptide representing the biologically active fragment of GHRH (amino acids 1-29) with full functional activity. It activates GHRH receptors on pituitary somatotrophs, stimulating cAMP production via Gs protein/adenylate cyclase and MAP kinase pathways. Due to the interactive effects of sermorelin and endogenous somatostatin, GH release is episodic rather than continuous. Sermorelin also stimulates pituitary gene transcription of GH mRNA, increasing and preserving pituitary GH reserve.
Research indicates 200-300 mcg administered once daily at bedtime via subcutaneous injection.
Bedtime administration (aligns with natural nocturnal GH release). On empty stomach.
12-24 week cycles. Some protocols use continuous treatment.
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