Klow is the branded name for kisspeptin, a neuropeptide that sits at the very top of your reproductive hormone cascade. It signals GnRH neurons in the hypothalamus to release GnRH, which triggers LH and FSH from the pituitary, which drives testosterone (or estrogen) production. It is the upstream signal. Human studies show acute kisspeptin administration produces measurable LH and testosterone spikes within hours. The appeal is that it works through your natural axis rather than suppressing it like exogenous testosterone does. Clinical trials are ongoing for both male hypogonadism and female fertility.
Klow (Kisspeptin) Protocol
Dose: 100-500mcg SubQ per administration | Frequency: Once daily or as directed by protocol | Cycle: Varies. Fertility protocols are typically short-term (days to weeks). Testosterone optimization may be longer. | Route: SubQ or IV (clinical)
Dosing protocols are still being established in clinical trials. Community dosing varies widely. The acute LH response is well-documented. Long-term testosterone elevation with repeated dosing is less clear.
Klow (Kisspeptin) Effects
LH and testosterone increase (70%). Acute LH spike within 30-60 minutes of administration. Testosterone follows within hours.
FSH stimulation (55%). Stimulates follicle-stimulating hormone, relevant for both male fertility and female ovulation.
Fertility support (50%). Clinical trials are investigating kisspeptin for triggering ovulation in IVF and restoring fertility in hypothalamic amenorrhea.
Maintained natural production (65%). Works through the HPG axis rather than replacing it. No HPTA suppression like exogenous testosterone.
Klow (Kisspeptin) Side Effects
Injection-site reactions (12%). Mild redness at the injection site. Standard.
Headache (8%). Mild headache in some users. Transient.
Flushing (5%). Brief warmth after injection. Related to the GnRH cascade activation.
Klow (Kisspeptin) Dosing by Use Case
Condition
Dose
Duration
Notes
Testosterone optimization (men)
100-500mcg SubQ daily
4-8 weeks, with labs
Kisspeptin stimulates your own testosterone production through the HPG axis. Unlike TRT, it does not suppress LH/FSH or shrink testes. Best for men who want higher testosterone without the consequences of exogenous hormones. Track total T, free T, LH, and FSH before and during.
Fertility support (male)
Per clinical protocol
Short-term courses
Kisspeptin stimulates both LH and FSH, supporting spermatogenesis. Being investigated as an alternative to hCG in fertility protocols. The advantage: it works upstream, preserving the natural signaling cascade.
Ovulation induction (female, clinical)
IV kisspeptin-54 in clinical trials
Single or short-course administration
Clinical trials are testing kisspeptin as an ovulation trigger in IVF, potentially safer than hCG for women at risk of ovarian hyperstimulation syndrome (OHSS). This is clinical territory, not self-administered.
Klow (Kisspeptin) Results Timeline
Hours, Acute LH response: LH spikes within 30-60 minutes of administration. Testosterone follows within 2-4 hours. This acute response is well-documented in human studies.
Week 1-2 weeks, Testosterone trending up: With repeated daily dosing, total testosterone may begin trending upward. Labs at 2 weeks give the first meaningful data point.
Week 4-8 weeks, Sustained effect assessment: Longer-term testosterone and fertility effects become clearer. The question is whether the HPG axis maintains responsiveness with repeated stimulation or downregulates. Data is still emerging.
Frequently Asked Questions About Klow (Kisspeptin)
What is klow (kisspeptin)?
Klow is a branded name for kisspeptin, a neuropeptide produced in the hypothalamus that triggers the entire reproductive hormone cascade. It signals GnRH neurons to release gonadotropin-releasing hormone, which stimulates LH and FSH from the pituitary, which drives testosterone or estrogen production. It is the master switch at the top of the HPG (hypothalamic-pituitary-gonadal) axis.
Does kisspeptin increase testosterone?
Yes, acutely. Human studies show that kisspeptin administration produces measurable LH spikes within 30-60 minutes and testosterone increases within hours. The key question is sustainability: whether repeated dosing produces sustained testosterone elevation or whether the GnRH neurons desensitize over time. Long-term data in healthy men is still limited.
Kisspeptin vs TRT: what is the difference?
TRT replaces your testosterone from outside, which suppresses your natural LH/FSH production and can shrink testes and impair fertility. Kisspeptin works upstream, stimulating your own HPG axis to produce more testosterone naturally. LH, FSH, and testicular function are preserved. The trade-off: kisspeptin is less potent and less predictable than direct testosterone replacement.
What are the side effects of kisspeptin?
In clinical trials, side effects have been mild: injection-site reactions, mild headache, and transient flushing. No serious adverse events reported. The safety profile appears clean, which is consistent with it being an endogenous peptide your body already produces.
What is the best klow dosage?
Community protocols range from 100-500mcg SubQ daily. Clinical trials have used various forms (kisspeptin-10, kisspeptin-54) at different doses via IV and SubQ. There is no established standard dose for testosterone optimization. Start low (100mcg), track labs (LH, total T, free T), and adjust. The acute LH response is the biomarker to watch.
How do you reconstitute klow?
Add 1mL of bacteriostatic water to a 5mg vial. That gives you 5mg per mL (5,000mcg per mL). For a 100mcg dose, draw 2 units on a U-100 insulin syringe. For 500mcg, draw 10 units. Swirl gently. Never shake. Refrigerate after reconstitution.
Can women use kisspeptin?
Yes. Kisspeptin is actively being studied in women for fertility applications. Clinical trials at Imperial College London used kisspeptin-54 to trigger egg maturation in IVF patients at high risk of ovarian hyperstimulation syndrome (OHSS), with promising safety data. Kisspeptin also plays a role in restoring menstrual cycles in women with hypothalamic amenorrhea. Female use outside clinical trials is not well-studied for other applications.
How fast does kisspeptin work?
Fast. LH spikes within 30-60 minutes of a single injection. Testosterone follows within 2-4 hours. This acute response is well-documented in multiple human studies. The question isn't whether it works acutely. It does. The question is whether that response holds up with repeated daily dosing over weeks, and that data is still thin.
Evidence
Emerging evidence. Kisspeptin is a naturally occurring neuropeptide that triggers the HPG axis. Human studies show it acutely stimulates LH, FSH, and testosterone release. Clinical trials for fertility (both male and female) are ongoing.
Approval status: Not approved. Clinical trials ongoing for fertility.
References
Dhillo WS, Chaudhri OB, Patterson M, et al. Kisspeptin-54 stimulates the hypothalamic-pituitary gonadal axis in human males. J Clin Endocrinol Metab, 2005. PMID 16174713
George JT, Veldhuis JD, Roseweir AK, et al. Kisspeptin-10 is a potent stimulator of LH and increases pulse frequency in men. J Clin Endocrinol Metab, 2011. PMID 21715536
Jayasena CN, Abbara A, Comninos AN, et al. Kisspeptin-54 triggers egg maturation in women undergoing in vitro fertilization. J Clin Invest, 2014. PMID 25365224
Abbara A, Jayasena CN, Christopoulos G, et al. Efficacy of kisspeptin-54 to trigger oocyte maturation in women at high risk of ovarian hyperstimulation syndrome (OHSS) during in vitro fertilization (IVF) therapy. J Clin Endocrinol Metab, 2015. PMID 26037512
Seminara SB, Messager S, Chatzidaki EE, et al. The GPR54 gene as a regulator of puberty. N Engl J Med, 2003. PMID 14573733
Topaloglu AK, Tello JA, Kotan LD, et al. Inactivating KISS1 mutation and hypogonadotropic hypogonadism. N Engl J Med, 2012. PMID 22931259
Storage
Lyophilized: Refrigerate at 2-8C or freeze for long-term. Kisspeptin is relatively stable as dry powder.
Reconstituted: Refrigerate. Use within 2-4 weeks.
Water: Bacteriostatic water, 1mL per 5mg vial.
Needle: 30-31 gauge, 0.5 inch for subcutaneous injection
These statements have not been evaluated by the FDA. This content is for educational purposes only. Consult a healthcare professional before starting any protocol. vialprep sells injection supplies, not compounds.
This page is a community reference, not medical advice. Content reflects what users report, not clinical recommendations. Nothing here is approved for human use unless specifically noted. Always consult a healthcare professional before starting any protocol. vialprep sells injection supplies, not compounds.
