About this category
Melanocortin and kisspeptin analogs are typically used at very low doses, so impurity profiling is critical. We confirm exact sequence, screen for des-amino and oxidized variants, and quantify any related substances above 0.1%.
Featured peptides we test
PT-141 (Bremelanotide)
1025.18 g/mol
PT-141 (Bremelanotide) is a synthetic peptide analog derived from Melanotan II. It is a melanocortin receptor agonist that has been studied for its effects on sexual function and arousal.
View testing details →
Melanotan II
1024.18 g/mol
Melanotan II is a synthetic analog of alpha-melanocyte-stimulating hormone (α-MSH). It is a cyclic peptide that acts on melanocortin receptors and has been studied for various biological effects.
View testing details →
Kisspeptin
1302.46 g/mol
Kisspeptin (often as Kisspeptin-10) is a neuropeptide that activates the GPR54 receptor and is a master regulator of GnRH release. It is studied in reproductive endocrinology, puberty research, and fertility.
View testing details →
Sample submission
- 0.5 mg sufficient for full panel.
- PT-141 vs Melanotan II have similar MW — MS/MS fragmentation confirms identity.
Common impurities
- Cyclization variants
- Oxidized Trp
- Truncated analogs
Recommended tests
- RP-HPLC
- LC-MS/MS
- Endotoxin (LAL)
Sexual Health Testing Methodology
Our analytical workflow for sexual health peptides follows USP <1225> guidance for validated chromatographic methods. Every lot is processed by a credentialed analyst with documented chain of custody.
Step 1
Sample intake & cold storage
Each Sexual Health sample is logged with a chain-of-custody ID and stored at -20 °C upon arrival at our Florida lab.
Step 2
Reverse-phase HPLC purity
Samples are run on a C18 column using a water/acetonitrile gradient with 0.1% TFA, with UV detection at 214 nm to quantify main peak purity and named impurities.
Step 3
LC-MS / Orbitrap identity
Observed monoisotopic mass is compared against the theoretical mass for each sexual health compound to confirm identity. Blends are deconvoluted to quantify each active component.
Step 4
Optional residual & endotoxin testing
Residual solvents (GC-MS), residual TFA / acetate counterions, and bacterial endotoxin (LAL) are run on request based on intended downstream use.
Step 5
Signed Certificate of Analysis
Findings are compiled into a signed COA with chromatograms, spectra, instrument metadata, and analyst interpretation, delivered within 9-11 business days.
Sexual Health Purity Notes
Recommended research-grade purity for sexual health peptides is typically ≥ 98% by HPLC area. Synthesis-related impurities are common and only show up under proper analytical scrutiny.
Common impurities to watch
- Cyclization variants
- Oxidized Trp
- Truncated analogs
What our COA confirms
- Main peak purity by HPLC area %
- Observed vs theoretical monoisotopic mass
- Named impurities ≥ 0.1% area
- Net peptide content where applicable
- Method, column, and instrument metadata
Sexual Health Handling, Storage & Safety
Guidance below is for laboratory and research personnel only. Sexual Health peptides are supplied for research use and are not intended for human or veterinary use.
Storage
Store lyophilized material at -20 °C, protected from light and moisture. After reconstitution, aliquot and store at -80 °C; avoid repeated freeze-thaw cycles.
Reconstitution
Reconstitute in bacteriostatic or sterile water in a clean environment. Allow vials to reach room temperature before opening to prevent moisture condensation on the powder.
PPE & shipping
Handle with gloves, lab coat, and eye protection. Ship samples to ACS overnight on dry ice or cold packs in a rigid, leak-proof container with a packing slip referencing your quote.
This page is informational and does not constitute medical advice. Consult your institution's safety officer and SDS before working with these compounds.
Frequently asked questions
Related testing resources
- HPLC purity testing for sexual health peptides
- Mass spectrometry identity confirmation (ESI-MS)
- Heavy metal and residual solvent screening
- LAL endotoxin testing for injectable peptides
- Peptide testing cost by assay
- How to ship peptides to our lab
- Independent third-party COA verification
- Peptide testing labs near me — all 50 states
- How to read a peptide Certificate of Analysis
- What peptide testing labs measure
Other peptide testing categories
GLP-1 & Metabolic Peptide Testing
HPLC purity, mass spec identity, and impurity profiling for semaglutide, tirzepatide, retatrutide, and related GLP-1 / GIP / glucagon agonists.
Growth Hormone Secretagogue Testing
Independent HPLC and mass spec testing for sermorelin, ipamorelin, tesamorelin, hexarelin, and related GHRH / GHRP analogs.
Healing & Repair Peptide Testing
BPC-157, TB-500, GHK-Cu, KPV, and other tissue repair peptides — purity, identity, and contamination testing.
Cognitive & Nootropic Peptide Testing
Selank, Semax, Cerebrolysin, Noopept, Dihexa, and related cognitive research compounds.
Immune & Anti-Inflammatory Peptide Testing
Thymosin Alpha-1, Thymulin, LL-37, ARA-290, VIP, and related immunomodulators.
Mitochondrial & Longevity Compound Testing
NAD+, MOTS-c, SS-31, Humanin, 5-Amino-1MQ, BAM15, and related longevity research compounds.
Khavinson Bioregulator Testing
Epitalon, Pinealon, Vesugen, Vilon, Prostamax, Pancragen, and the full Khavinson short-peptide bioregulator family.
Growth & Muscle Peptide Testing
IGF-1 LR3, IGF-1 DES, MGF, PEG-MGF, Follistatin, ACE-031, and Myostatin inhibitors.
Compounded Peptide Blend Testing
Component-level analysis of compounded peptide blends such as Tesamorelin/Ipamorelin and Retatrutide/Cagrilintide.