The science of purity, refined to a discipline.
Pure Peptides Biopharmaceuticals supplies precision-synthesised research compounds to laboratories, clinicians and researchers worldwide. Every vial is third-party verified for identity, purity and integrity.
Three principles, non-negotiable.
Research demands trust at the molecular level. Our work is shaped by three commitments that govern every synthesis, every analysis, every shipment.
Solid-phase synthesis
Every peptide is produced via SPPS in cGMP-aligned facilities using high-purity Fmoc chemistry. Sequence fidelity is confirmed before release — never assumed. Identity verified by tandem mass spectrometry.
Verified to ≥99%
Independent reversed-phase HPLC analysis is performed on every production lot. We publish full Certificates of Analysis documenting purity, water content, peptide content and residual solvents.
Lyophilised. Sealed. Logged.
Compounds are vacuum-sealed under inert atmosphere and dispatched under temperature-controlled conditions. Each vial is traceable to its synthesis run via lot-coded chain of custody.
The 28-day rule — and the science behind it.
Once a lyophilised peptide is reconstituted with bacteriostatic water and held at 2–8 °C, its usable life is bounded by two independent factors: preservative decay and molecular degradation. Both converge at approximately twenty-eight days.
This is the beyond-use date established under USP Chapter <797>, the United States Pharmacopeia’s compounding standard governing multi-dose sterile preparations containing a preservative. Bacteriostatic water’s 0.9% benzyl alcohol reliably inhibits microbial growth to that point; beyond it, the vial is no longer considered protected.
Four degradation pathways
- Hydrolysis
Aqueous exposure progressively cleaves peptide bonds. Rate is temperature-dependent, but not zero at 2–8 °C.
- Oxidation
Methionine, cysteine and tryptophan residues are particularly vulnerable to oxidative damage.
- Deamidation & Aggregation
Asparagine and glutamine residues deamidate over time; monomeric peptide is lost to aggregation.
- Microbial Ingress
Benzyl alcohol preservative efficacy declines after 28 days. Multi-dose vials past this window are no longer aseptic.
Storage Protocol
| Lyophilised, sealed | −20 °C · protected from light |
| Reconstituted | 2–8 °C · original vial · upright · dark |
| Reconstituted at room temperature | 24–48 hours maximum |
| Freezing reconstituted solution | Not recommended — induces aggregation |
- United States Pharmacopeia. USP Chapter <797>: Pharmaceutical Compounding — Sterile Preparations. USP–NF Official Compendium.
- United States Pharmacopeia. Monograph: Bacteriostatic Water for Injection. USP–NF Official Compendium.
- Manning MC, Chou DK, Murphy BM, Payne RW, Katayama DS. Stability of protein pharmaceuticals: an update. Pharm Res. 2010;27(4):544–575.
The full research library.
Browse our complete inventory of peptides, secretagogues, blends and ancillaries. Every compound is supplied for laboratory research use only.
Metabolic Research
3 compoundsGLP-1, GIP and dual-agonist class research references studied in metabolic and weight-regulation science.
TR5
SP-RT5
MOTS-c
Growth & Recovery
2 compoundsGrowth-hormone secretagogues studied in regenerative and endocrine research.
Ipamorelin
CJC-1295 (no DAC)
Repair & Tissue
1 compoundPeptides investigated for connective-tissue, vascular and gastrointestinal repair pathways.
BPC-157 / TB-500 Blend
Cognitive & Neuro
2 compoundsNeuropeptides investigated for cognitive function, mood and neuroprotective research.
Semax
Selank
Cosmetic & Dermal
2 compoundsPeptides studied for pigmentation, dermal renewal and topical formulation research.
GHK-Cu (Copper Peptide)
GLOW Blend
Longevity & Cellular
2 compoundsMitochondrial, redox and senescence-pathway research references.
NAD+
Epithalon
Ancillaries
2 compoundsSolvents, carriers and supporting materials for laboratory reconstitution.
Bacteriostatic Water
Insulin Syringes × 100
What we ship is exactly what we say — to the milligram.
Sequence verified. Purity certified. Mass spectrometry signed off. If a lot fails any release criterion, it does not leave our facility. That is the only standard we recognise.
For verified researchers & institutions.
Our compounds are supplied to qualified research organisations, clinical laboratories and academic institutions.