Kisspeptin is a family of neuropeptides that acts upstream of gonadotropin-releasing hormone (GnRH) and is an important regulator of reproductive endocrine signaling. Human research has investigated several kisspeptin isoforms, especially Kisspeptin-10 and Kisspeptin-54, but there is no single universal BAC-water volume or standardized reconstitution concentration that applies to all kisspeptin research materials.
There is no universal BAC-water volume for Kisspeptin because the required liquid volume depends on the verified quantity of peptide and the concentration being mathematically targeted. More liquid produces a lower concentration; less liquid produces a higher concentration.
| Verified Vial Quantity | 1 mL | 2 mL | 2.5 mL | 3 mL | 5 mL |
|---|---|---|---|---|---|
| 1 mg* | 1 mg/mL | 0.5 mg/mL | 0.4 mg/mL | 0.333 mg/mL | 0.2 mg/mL |
| 5 mg* | 5 mg/mL | 2.5 mg/mL | 2 mg/mL | 1.667 mg/mL | 1 mg/mL |
| 10 mg* | 10 mg/mL | 5 mg/mL | 4 mg/mL | 3.333 mg/mL | 2 mg/mL |
Use the BacScience Universal BAC Water Calculator for custom concentration calculations.
The amount of liquid required for a mathematical target concentration is determined by the total peptide quantity and the desired concentration.
For example, if a verified vial contained 5 mg and the mathematical target were 2.5 mg/mL, the calculation would be:
Concentration is a mathematical property of mass and volume.
If a verified research sample contains 5 mg of Kisspeptin, the concentration depends on the liquid volume selected. These are mathematical examples and do not establish a preferred formulation.
If a verified vial contains 10 mg, the same concentration equation applies. The resulting concentration is determined by the volume selected for the mathematical calculation.
Kisspeptins are a family of neuropeptides encoded by the KISS1 gene. They signal through the kisspeptin receptor, commonly called KISS1R or GPR54.
Kisspeptin signaling is an important upstream regulator of gonadotropin-releasing hormone (GnRH). Through this pathway, kisspeptin participates in the control of LH and FSH secretion, puberty and reproductive function.
Human research has investigated several kisspeptin forms, particularly Kisspeptin-10 and Kisspeptin-54.
These isoforms should not be treated as interchangeable research materials. Published studies use different molecular forms, administration routes and units.
Kisspeptin-10 is the minimal kisspeptin sequence retaining substantial biological activity and has been studied in human endocrine experiments.
FDA has specifically evaluated Kisspeptin-10 in the context of proposed compounding and identified limited safety information and potential immunogenicity and characterization concerns.
Kisspeptin-54 is another naturally occurring kisspeptin isoform and has been investigated extensively in human reproductive-endocrine studies.
Human research has examined KP-54 in healthy volunteers, reproductive disorders and assisted reproduction research.
Kisspeptin acts upstream of GnRH neurons. Binding of kisspeptin to KISS1R/GPR54 stimulates signaling that can increase GnRH secretion, which in turn influences pituitary LH and FSH secretion.
This places kisspeptin at an important control point in the hypothalamic-pituitary-gonadal axis.
Human and translational research has investigated kisspeptin in reproductive endocrinology and related physiological questions.
Human studies demonstrate that exogenous kisspeptin can influence reproductive endocrine signaling. Importantly, studies use different isoforms, routes, units and experimental objectives.
| Study | Population | Peptide | Dose Studied | Route | Frequency / Duration | Research Objective |
|---|---|---|---|---|---|---|
| Kisspeptin-54 menstrual-cycle study | Healthy women | KP-54 | 0.2–6.4 nmol/kg | Subcutaneous bolus | Single bolus | Examined LH and gonadotropin responses across the menstrual cycle. |
| Kisspeptin-10 dose-response study | Healthy men | KP-10 | 0.01–3.0 μg/kg | IV bolus | Acute study | Investigated LH secretion and dose-response characteristics. |
| Kisspeptin-10 prolonged infusion study | Healthy men | KP-10 | 1.5–4 μg/kg/h | IV infusion | Up to 22.5 hours | Examined LH pulsatility and testosterone responses. |
| Direct KP-10 / KP-54 comparison | Healthy men | KP-10 & KP-54 | 0.1, 0.3 and 1.0 nmol/kg/h | IV infusion | 3-hour infusion | Compared gonadotropin responses to the two major kisspeptin isoforms. |
| IVF kisspeptin trigger trial | Women undergoing IVF | KP-54 | 1.6–12.8 nmol/kg | Subcutaneous | Single trigger; selected groups received repeat dosing | Investigated kisspeptin as an experimental trigger for oocyte maturation. |
Doses shown above are experimental parameters reported in human research and are not BacScience recommendations.
Published human studies demonstrate why it is important to distinguish between kisspeptin isoforms and units. Some studies report nmol/kg, others μg/kg, and infusion protocols may use nmol/kg/hour or μg/kg/hour.
Human research has examined bolus doses including 0.2–6.4 nmol/kg in healthy women.
Research unit: nmol/kgHuman male research has examined IV bolus doses ranging from 0.01–3.0 μg/kg.
Research unit: μg/kgControlled studies have investigated 0.1–1.0 nmol/kg/h IV infusion rates.
Research unit: nmol/kg/hKisspeptin biology was established through extensive animal and molecular research before and alongside human investigations.
Animal studies have contributed substantially to understanding kisspeptin's role in puberty, fertility, reproductive hormone feedback and GnRH pulse generation.
For mathematical concentration calculations, the fundamental relationship is mass divided by volume.
Keeping the peptide quantity constant while increasing the liquid volume decreases the resulting concentration.
Keeping the peptide quantity constant while decreasing the liquid volume increases the resulting concentration.
Enter the verified vial quantity and liquid volume in the BacScience Universal BAC Water Calculator.
Changing the liquid volume changes the concentration represented by the solution. It does not mathematically change the total quantity originally present in the vial, assuming no material loss.
| Example Vial | Liquid Volume | Calculation | Resulting Concentration |
|---|---|---|---|
| 1 mg* | 1 mL | 1 ÷ 1 | 1 mg/mL |
| 1 mg* | 2 mL | 1 ÷ 2 | 0.5 mg/mL |
| 5 mg* | 2 mL | 5 ÷ 2 | 2.5 mg/mL |
| 10 mg* | 5 mL | 10 ÷ 5 | 2 mg/mL |
FDA's October 2024 briefing document states that Kisspeptin-10 is not a component of an FDA-approved drug and that there is no applicable USP or National Formulary drug-substance monograph for Kisspeptin-10.
The FDA Pharmacy Compounding Advisory Committee subsequently voted unanimously against placing Kisspeptin-10 on the 503A Bulks List.
FDA identifies potential risks involving immunogenicity for certain administration routes and complexities involving peptide-related impurities and active pharmaceutical ingredient characterization.
FDA has also stated that it has limited safety information for proposed routes and therefore lacks sufficient information to determine whether the drug could cause harm in humans via those routes.
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There is no universal volume. The mathematical volume depends on the verified peptide quantity and target concentration. Concentration is calculated as mg divided by mL.
There is no universal answer. If a verified sample contained 5 mg, then 2 mL would mathematically produce 2.5 mg/mL, while 5 mL would produce 1 mg/mL.
The answer depends on the mathematical concentration target. For example, 10 mg divided by 2 mL equals 5 mg/mL, while 10 mg divided by 5 mL equals 2 mg/mL.
Concentration in mg/mL equals the total peptide quantity in milligrams divided by the liquid volume in milliliters.
No. Kisspeptin-10 and Kisspeptin-54 are different kisspeptin isoforms. Human studies use different doses and experimental protocols for the two forms, so they should not be treated as interchangeable.
Kisspeptin-10 is a biologically active kisspeptin peptide sequence that has been investigated in human reproductive endocrinology research, including studies of LH secretion.
Kisspeptin-54 is another naturally occurring kisspeptin isoform that has been investigated in human studies involving reproductive hormone signaling and assisted reproduction.
Kisspeptin-10 is not a component of an FDA-approved drug. FDA evaluated Kisspeptin-10 in the context of proposed compounding and the Pharmacy Compounding Advisory Committee voted against placing it on the 503A Bulks List.
Human studies have investigated different quantities depending on the isoform and route. Examples include KP-54 bolus doses expressed in nmol/kg and KP-10 studies expressed in μg/kg. Infusion studies have also used nmol/kg/hour or μg/kg/hour.
No. A research dose describes an experimental study protocol. It should not automatically be converted into an individualized treatment recommendation.
Mathematically, adding more liquid changes the concentration, not the original total peptide quantity, assuming no material is lost.
Yes. The calculator can perform the mass-to-volume concentration calculation using a custom verified vial quantity and liquid volume.
Scientific claims on this page should be supported primarily by PubMed-indexed research, ClinicalTrials.gov records and FDA regulatory documents rather than vendor or community sources.
September 10, 2026
Scientific basis: FDA regulatory documents, PubMed-indexed human research, peer-reviewed reviews and ClinicalTrials.gov.
Reviewer: BacScience Scientific Content Team