Understand the source comparison
Real Peptides Kisspeptin vs Competitors Quality Comparison
Before reviewing this table, understand what separates research-grade from commercial-grade peptides: documentation. A supplier can claim 99% purity, but without published HPLC chromatograms, mass spectrometry data, and endotoxin assay results, that claim is u
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Before reviewing this table, understand what separates research-grade from commercial-grade peptides: documentation. A supplier can claim 99% purity, but without published HPLC chromatograms, mass spectrometry data, and endotoxin assay results, that claim is unverifiable. The comparison below evaluates suppliers on transparency, testing frequency, and storage protocols. The factors that determine whether peptides perform consistently across experiments.
- Real Peptides
- Dual verification: in-house HPLC + third-party mass spectrometry on every batch
- Standard on all batches; published results typically 0.1–0.5 EU/mg
- Argon-atmosphere lyophilization, stored at −20°C, shipped on dry ice with temperature logging
- Published online by lot number; includes HPLC chromatogram, MS data, LAL results
- Highest transparency and batch-specific verification; premium cost justified by reproducible results
- Generic Supplier A
- HPLC on representative sample from production run (1 vial per 500+ batch)
- Not routinely performed; available on request at additional cost
- Standard vacuum lyophilization; ambient-temperature shipping with '−20°C storage' label
- COA provided on request; often lacks chromatogram or specifies only purity percentage
- Lower cost but inconsistent batch quality; suitable for preliminary studies only
- Generic Supplier B
- HPLC on composite sample; no mass spectrometry confirmation
- Not disclosed in standard COA
- Not disclosed; likely ambient storage based on shelf-life claims
- Generic COA template; no batch-specific data or chromatograms
- Minimal transparency; significant risk of sequence errors or oxidative degradation
- Boutique Research Supplier
- HPLC and MS on individual batches; similar methodology to Real Peptides
- Performed but not always published in COA
- Cold-chain shipping; storage protocol not disclosed
- Available by request; turnaround time 2–5 business days
- Comparable quality to Real Peptides but less accessible documentation
- University Core Facility (Custom Synthesis)
- In-house HPLC; MS available at additional fee
- Not standard; must be requested and paid separately
- Variable; depends on facility SOP and equipment availability
- Provided as PDF; format and detail vary by facility
- High customization but inconsistent QC standards across institutions