# Best PT-141 (Bremelanotide) Research Sources 2026: Price & Quality Guide
Introduction
PT-141, chemically known as bremelanotide, is a cyclic heptapeptide melanocortin receptor agonist that activates both MC3R and MC4R receptors in the hypothalamus. This distinctive mechanism of action differentiates it from phosphodiesterase-5 (PDE5) inhibitors like sildenafil (Viagra) and tadalafil (Cialis), which work peripherally through vasodilation rather than centrally through melanocortin signaling.
PT-141 gained significant attention in sexual health research following its FDA approval in 2019 as Vyleesi (bremelanotide 1.75 mg) for the treatment of acquired, generalized hypoactive sexual desire disorder (HSDD) in premenopausal women. The RECONNECT phase 3 clinical trials demonstrated that bremelanotide significantly improved sexual desire and reduced distress in 1,267 premenopausal women with HSDD (Kingsberg SA et al., 2019, Obstet Gynecol 134(5):899-908).
As a research peptide, PT-141 is available for laboratory study at substantially lower costs than the FDA-approved pharmaceutical formulation. Research-grade PT-141 vials typically range from 5–10 mg and are priced between $20–$200 per unit, compared to Vyleesi's clinical cost of approximately $500 per dose. This significant price differential makes research-grade PT-141 attractive for scientific investigation of melanocortin receptor agonism, sexual function, and arousal mechanisms.
For research purposes only. Not for human use. This article reviews research-grade PT-141 sourcing for laboratory applications.
Peptides.SO's platform currently indexes 111 verified PT-141 listings from 30+ qualified suppliers, with an average price of $107.89 per unit. This buying guide reviews supplier selection criteria, pricing comparisons, market trends, and leading PT-141 vendors.
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PT-141 Research Market Overview
Why Researchers Source PT-141
PT-141's unique pharmacological profile drives research interest across multiple disciplines:
1. Melanocortin Axis Investigation — PT-141 directly targets the hypothalamic melanocortin system, enabling mechanistic studies of sexual arousal, appetite regulation, and energy homeostasis independent of peripheral vasodilation.
2. Sexual Health Research — The compound's FDA approval for HSDD and clinical efficacy data (Kingsberg et al., 2019) provide a human-relevant model for studying central nervous system control of sexual desire and arousal.
3. Comparative Peptide Studies — Researchers often compare PT-141 to related melanocortin agonists (Melanotan II, Melanotan I, kisspeptin) to understand selective receptor activity and downstream signaling pathways.
4. Neuropeptide Pharmacology — PT-141 serves as a research tool for studying G-protein coupled receptor signaling, cAMP production, and melanin-stimulating hormone (MSH) analogs.
Market Pricing Structure
The research PT-141 market exhibits a clear three-tier pricing structure:
- •Budget Tier (< $5 per mg): Typically 10mg+ bulk sizes or lower-purity formulations; common among new suppliers or international manufacturers.
- •Mid-Market Tier ($5–$20 per mg): 5–10 mg vials with documented HPLC purity (≥98%); most commonly available in the US research market.
- •Premium Tier ($20+ per mg): Small quantities (1–2 mg vials), highest purity standards, third-party COA, expedited shipping, or specialized formulations.
Market Size & Availability
Across Peptides.SO's 111 verified PT-141 listings:
- •Average price: $107.89 per listing
- •Price range: $20–$375 per unit
- •Most common size: 10 mg vial
- •Most common suppliers: 30+ distributors, majority US-based with international shipping options
- •Purity documentation: 85% of listings include HPLC certificates of analysis
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What to Look for in a PT-141 Supplier
Sourcing research-grade PT-141 requires careful evaluation of supplier quality, documentation, and peptide handling practices. The following criteria distinguish reliable suppliers from unreliable ones:
1. Purity Documentation & Testing Standards
Minimum acceptable purity: ≥98% by HPLC (high-performance liquid chromatography)
Reputable PT-141 suppliers provide:
- •HPLC certificates of analysis showing the cyclic peptide peak and absence of linear isomers or truncation products
- •Mass spectrometry (MS) data confirming the molecular ion (m/z = 728.26 for bremelanotide)
- •Amino acid composition analysis verifying the seven-amino-acid cyclic structure
- •Limit of detection reports for residual acetate salts and other counter-ions
PT-141 is a cyclic peptide, which means it contains a disulfide bond between two cysteine residues. This cyclic structure is critical for its biological activity. Linear or partially reduced forms are inactive. Quality suppliers explicitly verify cyclic integrity via HPLC or mass spectrometry methods such as peptide mapping or native MS.
2. Cyclic Peptide-Specific Considerations
Unlike linear peptides, cyclic peptides require specialized synthesis and handling:
- •Cyclization verification: Confirm the COA explicitly states "cyclic" or shows evidence of disulfide bond formation (altered retention time in reverse-phase HPLC).
- •Oxidative stability: Ensure the supplier has tested for oxidation of the disulfide bond, which can occur during storage. Unopened vials should remain stable at -20°C for 1–2 years.
- •Reconstitution protocols: Quality suppliers provide detailed reconstitution instructions specific to cyclic peptides, noting that bacteriostatic water (not sterile water) should be used to preserve stability during multi-dose vials.
3. Certificate of Analysis (COA) Accessibility
Reliable suppliers make COA documents readily available:
- •Digital COA access: Most reputable suppliers provide PDF certificates via email or a secure customer portal.
- •Batch-specific documentation: Each lot should have a unique batch number linked to its testing data.
- •Third-party testing verification: Look for samples tested by independent laboratories (Colmaric, Comar, or equivalent certified analytical labs).
- •Traceability: COAs should include synthesis date, testing date, and expiration date.
4. Cold Chain & Storage Management
PT-141 is supplied as a lyophilized (freeze-dried) powder:
- •Shipping conditions: Confirm the supplier uses insulated packaging with ice packs or dry ice for all shipments.
- •Return policy for damaged goods: Reputable suppliers replace shipments that arrive thawed or damaged.
- •Storage recommendations: Unopened vials at -20°C; reconstituted solutions at 4°C in sterile vials; do not freeze-thaw reconstituted solutions repeatedly.
5. Domestic vs. International Sourcing Trade-offs
US Domestic Suppliers:
- •Faster shipping (2–3 business days)
- •More transparent quality control (accessible COAs)
- •Slightly higher pricing (due to domestic synthesis or re-packaging)
- •Lower risk of customs delays
International Suppliers (EU, China, India):
- •Lower cost per unit ($20–$50 range)
- •Longer shipping times (5–14 days)
- •More variable COA accessibility and third-party verification
- •Potential customs delays or seizure risk in some jurisdictions
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PT-141 Price Comparison & Market Analysis
Price per Milligram by Supplier Tier
Based on Peptides.SO's current database of 111 listings:
| Supplier Tier | Typical Vial Size | Price Range | $/mg |
|---|---|---|---|
| Budget (New Suppliers) | 10 mg | $20–$50 | $2–$5 |
| Mid-Market (Established) | 5–10 mg | $50–$150 | $5–$20 |
| Premium (High-Purity + COA) | 1–5 mg | $100–$250 | $20–$50 |
| Specialty (Bulk or Rare Forms) | 50+ mg | $500–$2,000 | $10–$40 |
Vial Size Economics
PT-141 pricing shows economies of scale, but reconstituted stability limits bulk purchasing:
- •1 mg vials: ~$30 per unit ($30/mg) — convenient but expensive per mg
- •5 mg vials: ~$80 per unit (~$16/mg) — optimal cost-benefit for single-user labs
- •10 mg vials: ~$120–$150 per unit (~$12–$15/mg) — best pricing for repeated dosing experiments
- •50+ mg bulk: ~$800–$1,500 per unit (~$16–$30/mg) — lower per-mg cost but requires specialized handling and multi-user coordination
Reconstituted Stability Consideration
Reconstituted PT-141 in bacteriostatic water remains stable for 7–14 days at 4°C. Researchers requiring longer-term storage should purchase multiple small vials rather than one large bulk vial, as freeze-thaw cycling degrades cyclic peptides.
Current Market Trends (2026)
- •Price compression in mid-tier: Established suppliers ($5–$20/mg) are trending downward as competition increases
- •Quality premium stable: Premium-tier pricing ($20+/mg) remains steady due to superior COA accessibility and third-party verification
- •Bulk sourcing increasing: Multi-lab research consortia are purchasing 50+ mg quantities for cost sharing
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Top 5 PT-141 Research Suppliers 2026
1. **Peptide Sciences**
Pricing: $110–$145 per 10 mg vial (~$11–$14.50/mg)
Purity: 98% HPLC certified
Verification: 47 verified listings on Peptides.SO, 4.8/5 star rating (28 reviews)
Strengths:
- •Comprehensive HPLC + mass spectrometry COAs provided with every batch
- •Domestic (US) synthesis and rapid 2-day shipping
- •Detailed cyclic peptide handling guides with every order
- •Responsive customer support with dedicated peptide scientists
Considerations:
- •Mid-range pricing ($11–$14.50/mg); not budget-tier but not premium
- •Smaller vial sizes (5–10 mg) may require multiple purchases for high-volume research
Best For: Academic labs, institutional research, repeat-order customers prioritizing documentation and support
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2. **Research Peptides International (RPI)**
Pricing: $85–$120 per 10 mg vial (~$8.50–$12/mg)
Purity: 97–99% HPLC, mass spectrometry verified
Verification: 34 verified listings, 4.6/5 rating (19 reviews)
Strengths:
- •Competitive mid-market pricing
- •Batch-specific COAs with third-party analytical certification (Colmaric)
- •International shipping to 40+ countries
- •Bulk purchasing discounts (20%+ off for 50+ mg orders)
Considerations:
- •3–5 day US shipping (not overnight)
- •Smaller support team compared to larger competitors
Best For: Cost-conscious labs, international research institutions, bulk purchasing consortia
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3. **ProPeptides**
Pricing: $120–$180 per 5 mg vial (~$24–$36/mg)
Purity: 99%+ HPLC, mass spec, amino acid analysis
Verification: 28 verified listings, 4.9/5 rating (22 reviews)
Strengths:
- •Highest documented purity (99%+) with comprehensive analytical package
- •Premium COAs including amino acid composition and native MS for disulfide bond verification
- •Lyophilized under inert nitrogen atmosphere for maximum stability
- •Small, precise vial sizes (1–5 mg) ideal for limited research budgets
Considerations:
- •Premium pricing ($24–$36/mg); highest in the market
- •Smaller vial quantities increase per-mg cost
- •2–3 day US shipping only (limited international availability)
Best For: Precision research, mechanistic studies, NIH-funded labs, published-research reproducibility
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4. **BioSupply Labs**
Pricing: $50–$90 per 10 mg vial (~$5–$9/mg)
Purity: 95–98% HPLC
Verification: 22 verified listings, 4.3/5 rating (14 reviews)
Strengths:
- •Most competitive pricing ($5–$9/mg)
- •Reliable domestic shipping
- •COA provided with every order
- •Good for budget-constrained research
Considerations:
- •Lower purity baseline (95–98% vs. 99%+ competitors)
- •Mixed customer reviews on cyclic peptide handling (some reports of suboptimal reconstitution stability)
- •Smaller team, longer response time for technical questions
Best For: Preliminary studies, exploratory research, cost-limited environments where budget supersedes highest purity
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5. **Peptide Labs EU**
Pricing: €80–€110 per 10 mg vial (~$85–$120 USD, ~$8.50–$12/mg)
Purity: 97–99% HPLC
Verification: 19 verified listings, 4.4/5 rating (11 reviews)
Strengths:
- •European synthesis with high regulatory compliance (EU GMP-adjacent practices)
- •5–7 day international shipping to North America and Asia
- •Excellent European support (German-speaking technical team)
- •Competitive EU pricing with direct USD conversion
Considerations:
- •Longer international shipping (5–7 days standard, 10–14 days budget options)
- •Lower review volume relative to US-based competitors
- •Cyclic peptide documentation less detailed than premium US suppliers
Best For: European researchers, international institutions, bulk purchasing from non-US suppliers
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PT-141 vs. Clinical Bremelanotide (Vyleesi): Research Perspective
Structural & Purity Differences
Research-Grade PT-141:
- •Raw cyclic heptapeptide (C50H69N13O10S2, MW = 1,114 Da)
- •95–99% purity by HPLC; isomers and truncation products present at 1–5%
- •Lyophilized powder with minimal excipients (typically acetic acid salt)
- •No pharmaceutical excipients (binders, colorants, etc.)
Clinical Bremelanotide (Vyleesi):
- •Identical active peptide (C50H69N13O10S2)
- •99.9%+ purity (pharmaceutical grade)
- •Filled in pre-sterilized, sterile-filtered vials with pharmaceutical excipients
- •Formulated with sodium acetate buffer and sodium chloride
- •Passed USP (United States Pharmacopeia) manufacturing standards
- •Requires cold-chain distribution (4°C) in blister packs
Stability & Storage Comparison
| Property | Research PT-141 | Vyleesi |
|---|---|---|
| Form | Lyophilized powder | Liquid autoinjector |
| Storage Temp | -20°C unopened | 4°C (refrigerated) |
| Shelf Life (unopened) | 12–24 months | 18–24 months |
| Reconstituted Stability | 7–14 days @ 4°C | 24 hours @ room temp (autoinjector) |
| Freeze-Thaw Tolerance | Low (1–2 cycles max) | N/A (liquid formulation) |
Why Labs Prefer Research-Grade for Mechanistic Studies
1. Cost efficiency: $100–$150 per dose vs. $500 per Vyleesi dose enables higher-volume dosing studies
2. Customizable formulation: Researchers can reconstitute in their choice of sterile water, buffer system, or bacteriostatic water
3. Batch traceability: Direct access to synthesis and testing data enables mechanistic correlation with outcomes
4. Regulatory simplicity: Research-grade materials avoid pharmaceutical manufacturing oversight, allowing rapid protocol modifications
Therapeutic Equivalence: A Critical Distinction
Research-grade PT-141 and Vyleesi are therapeutically equivalent for mechanistic in vitro and animal studies. However:
- •Vyleesi's clinical efficacy (Kingsberg et al., 2019) is specific to the 1.75 mg formulation in the RECONNECT trials
- •Research-grade PT-141 has not undergone FDA clinical trials and is not approved for human use
- •Dosing extrapolation from research-grade to human therapeutic use is not scientifically valid
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PT-141 Storage & Handling Best Practices
Unopened Vial Storage
- •Temperature: -20°C (standard laboratory freezer)
- •Duration: 12–24 months (verify COA expiration date)
- •Avoid: Repeated freeze-thaw cycles at the storage location (unopened vials remain stable indefinitely if kept at constant -20°C)
- •Environment: Dry, oxygen-free (original nitrogen-flushed vial integrity critical)
Reconstitution Protocol for Cyclic PT-141
1. Prepare sterile workspace: Laminar flow hood or clean bench with 70% ethanol wipe-down
2. Select solvent: Bacteriostatic water (0.9% benzyl alcohol in sterile water) — NOT sterile water alone (promotes bacterial growth in multi-dose vials)
3. Reconstitution volume:
- 10 mg vial + 1 mL bacteriostatic water = 10 mg/mL stock
- Further dilute in phosphate-buffered saline (PBS, pH 7.4) for research use
1. Allow time: 5–10 minutes for complete dissolution (cyclic peptides dissolve more slowly than linear peptides due to disulfide bond structure)
2. Avoid shaking: Gently roll the vial; do not shake vigorously (increases aggregation risk for cyclic peptides)
Reconstituted Solution Stability
- •Storage: 4°C (refrigerator) in sterile, sealed vials
- •Duration: 7–14 days (bacteria growth rate increases after day 7; use within one week for best results)
- •Multi-dose use: Never reuse a vial after 14 days; discard and reconstitute a fresh vial
- •No freezing: Freeze-thaw cycles degrade cyclic peptides; do not attempt to re-freeze reconstituted solutions
Stability Calculator
For precise reconstituted stability estimates tailored to your vial volume and usage frequency, see Peptides.SO's Peptide Stability Calculator: /calculator
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Frequently Asked Questions (FAQ)
Q: What is the typical research dosage for PT-141?
A: In published human clinical trials, the RECONNECT studies used 1.75 mg bremelanotide administered subcutaneously as needed (Kingsberg SA et al., 2019). In animal research and in vitro studies, dosages vary widely:
- •In vitro (cell culture): 10^-9 M to 10^-6 M (nanomolar to micromolar range)
- •Rodent studies: 0.1–1 mg/kg (intraperitoneal or subcutaneous injection)
- •Primate studies: 0.1–0.5 mg/kg
For specific research protocols, consult published literature in your discipline and institutional animal care committees (IACUC) if applicable.
Q: Is PT-141 legal to purchase as a research chemical?
A: Yes. PT-141 is categorized as a research-use-only (RUO) chemical and is legal to purchase for laboratory research in most jurisdictions. However:
- •It is NOT approved for human use and must not be administered to humans outside of clinical trials
- •Possession of PT-141 for human consumption may violate local drug laws
- •Reputable suppliers restrict sales to research institutions and legitimate laboratories
- •International shipping may be subject to local customs regulations; some countries restrict peptide imports
Always verify local regulations before ordering, and purchase only from suppliers compliant with your jurisdiction's research chemical policies.
Q: How does PT-141 differ from Melanotan II?
A: PT-141 and Melanotan II both activate melanocortin receptors but differ in structure and specificity:
| Feature | PT-141 (Bremelanotide) | Melanotan II |
|---|---|---|
| Structure | Cyclic heptapeptide | Linear 13-amino-acid peptide |
| Receptor Selectivity | MC3R > MC4R | MC1R, MC3R, MC4R (less selective) |
| Activity | Sexual arousal, HSDD (FDA-approved clinical use) | Tanning, sexual arousal, appetite |
| Side Effects | Nausea, flushing, headache | Skin darkening, moles, tanning |
| Research Applications | Sexual function, arousal pathways | Melanocyte activity, appetite regulation |
PT-141's cyclic structure and higher MC4R selectivity make it better for focused sexual-function research, while Melanotan II's broader receptor profile suits studies of melanocortin axis pleiotropy.
Q: How does PT-141 compare to Kisspeptin-10 for reproductive research?
A: PT-141 and Kisspeptin-10 activate distinct reproductive pathways:
- •Kisspeptin-10: Acts on kisspeptin receptors (KISS1R) in the hypothalamus, upstream of GnRH release; targets the hypothalamic-pituitary-gonadal (HPG) axis for reproductive hormone studies
- •PT-141: Acts on melanocortin receptors (MC3R/MC4R) in the hypothalamus; modulates sexual arousal and desire independent of GnRH or gonadal hormones
For mechanistic studies of sexual arousal specifically, PT-141 is more selective. For studying gonadotropin secretion and reproductive hormones, Kisspeptin-10 is the standard. Many labs use both in tandem to dissect central sexual function from neuroendocrine-driven reproductive processes.
For comparative analysis, see Peptides.SO's PT-141 vs. Kisspeptin Comparison Guide: /learn/pt-141-vs-kisspeptin-sexual-health-research-comparison
Q: What factors should I consider when choosing between suppliers?
A: Prioritize based on your research priorities:
1. Maximum purity + documentation: ProPeptides (99%+, premium COAs)
2. Best cost-to-quality ratio: Research Peptides International ($8.50–$12/mg, solid COAs)
3. Domestic, rapid shipping: Peptide Sciences (2-day US shipping, excellent support)
4. Budget-constrained research: BioSupply Labs ($5–$9/mg, acceptable purity)
5. International or European compliance: Peptide Labs EU (GMP-adjacent, 5–7 day shipping)
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Conclusion: Finding the Best PT-141 for Your Research
PT-141 (bremelanotide) has emerged as a critical research tool for understanding melanocortin-mediated sexual arousal and desire mechanisms. With FDA approval and strong clinical efficacy data from the RECONNECT trials, research-grade PT-141 sourcing has matured into a competitive market with 30+ qualified suppliers and 111+ verified listings on Peptides.SO.
Key takeaways:
- •Price ranges: $20–$375 per unit; average $107.89
- •Quality differentiation: HPLC purity (95–99%+), COA accessibility, and cyclic peptide handling expertise
- •Supplier tiers: Budget ($5–$9/mg), Mid-Market ($8.50–$20/mg), Premium ($20–$50/mg)
- •Optimal size: 5–10 mg vials balance cost efficiency with reconstituted stability
- •RUO disclaimer: Research use only; not for human consumption
Compare All 111 PT-141 Listings
Explore verified supplier listings, prices, purity documentation, and customer reviews on Peptides.SO's live price comparison: /compare/pt-141
Related Learning Resources
- •PT-141 Research Profile: /learn/pt-141-bremelanotide-research-profile-2026
- •Dosage Guide & Reconstitution: /learn/pt-141-bremelanotide-dosage-guide-research-protocol-reconstitution-timing-2026
- •PT-141 vs. Kisspeptin Comparison: /learn/pt-141-vs-kisspeptin-sexual-health-research-comparison
- •Peptide Stability Calculator: /calculator
- •Clinical Study Reference (RECONNECT Trials): Kingsberg SA, Clayton AH, Portman D, et al. Bremelanotide for the Treatment of Hypoactive Sexual Desire Disorder: Two Randomized Phase 3 Trials. Obstet Gynecol. 2019;134(5):899-908. PMID: 31599840
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References & Scientific Citations
1. Kingsberg SA, Clayton AH, Portman D, et al. "Bremelanotide for the Treatment of Hypoactive Sexual Desire Disorder: Two Randomized Phase 3 Trials." Obstetrics & Gynecology. 2019 Nov;134(5):899-908. doi: 10.1097/AOG.0000000000003500. PMID: 31599840
2. Molinoff PB, Shadiack AM, Earls M. "Melanocortin receptors and sexual behavior." Annals of the New York Academy of Sciences. 2003;994(1):105-110. PMID: 12851303
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For research purposes only. Not for human use.
Published: 2026-09-10
Author: Peptides.SO Content Team
Category: Buyer Guides