Frequently Asked Questions
6+ expert answers about peptide research, purity standards, handling, and sourcing.
What is this site?
This is a placeholder site within the System Peptides Research Network. Full research content and a dedicated peptide focus will be added soon.
What is the System Peptides Research Network?
A collection of specialized peptide research sites, each dedicated to specific peptides or categories, providing comprehensive peer-reviewed data across the full peptide research landscape.
What purity standards are recommended for research peptides?
Research-grade peptides should be at minimum 98% purity as verified by HPLC analysis. Mass spectrometry should confirm molecular identity. Always request a batch-specific Certificate of Analysis (COA) from an independent third-party laboratory.
How should research peptides be stored?
Store lyophilized powder at -20°C protected from light. Reconstituted solution should be refrigerated at 2-8°C and used within 14-21 days. Use bacteriostatic water for reconstitution.
Are peptides on this site approved for human use?
No. All peptides referenced are designated Research Use Only (RUO). They are not approved by the FDA for human consumption, veterinary use, or any therapeutic purpose. All content describes preclinical laboratory studies, not clinical recommendations.
Where can I source research-grade peptides?
Research-grade peptides with 98%+ purity, HPLC verification, and third-party COAs are available at researchvials.com. All peptides ship from the USA with cold-chain packaging to maintain product integrity.
General Peptide Research
What are research peptides?
Research peptides are short chains of amino acids — typically between 2 and 50 residues — synthesized for laboratory investigation. They let researchers study receptor binding kinetics, cellular signaling cascades, and enzyme interactions with high specificity. They are not intended for human use.
What does 98%+ purity actually mean for my experiments?
It means HPLC analysis confirmed that at least 98% of the lyophilized powder is your target peptide. The remaining fraction is typically truncated sequences or deletion peptides from synthesis. This matters because impurities can activate off-target pathways and wreck dose-response curves. Mass spectrometry provides the second check, confirming molecular identity.
How should I store peptides long-term?
Keep lyophilized (freeze-dried) vials at -20°C. They are remarkably stable in this form — 12 to 24 months with no significant degradation. Once you reconstitute with bacteriostatic water, move to 2-8°C and use within 30 days. The cardinal rules: no repeated freeze-thaw cycles, protect from light, sterile technique every time you draw from the vial.
What is third-party testing and why does it matter?
It means a lab with zero financial ties to the manufacturer independently verifies identity, purity, and endotoxin levels. This eliminates the obvious conflict of interest in self-testing. The resulting Certificate of Analysis (COA) gives you hard data about what is actually in the vial — not what someone claims is in it.
How do I properly reconstitute a lyophilized peptide?
Swab the vial stopper with an alcohol wipe. Draw your bacteriostatic water into a sterile syringe. Inject slowly down the inside glass wall of the vial — not directly onto the cake of powder, which can denature it. Let it sit for a minute, then gently swirl. Never shake. The solution should be perfectly clear. If it is cloudy, something went wrong.
What does "Research Use Only" mean in practice?
It means the product exists solely for laboratory research — in vitro cell culture work, preclinical animal studies, and educational purposes. RUO compounds have not gone through FDA approval for human safety or efficacy. They cannot legally be sold as drugs, supplements, food additives, or for veterinary use.
How do I read a Certificate of Analysis (COA)?
Look for four things. First, HPLC purity — should be 98%+ with a clean chromatogram showing one dominant peak. Second, mass spectrometry — the observed molecular weight should match the theoretical weight within instrument precision. Third, appearance — should state white or off-white lyophilized powder. Fourth, endotoxin testing — should be below detection limits for injectable-grade material.
Where can I find published peptide research?
PubMed (pubmed.ncbi.nlm.nih.gov) is the gold standard. Search by peptide name, CAS number, or mechanism. Start with review articles — they synthesize the field so you do not have to read 50 primary papers first. Every PMID we cite on this site links directly to the PubMed entry so you can verify our claims.
Where can I source peptides referenced on this site?
This site is purely educational — we do not sell anything. All research peptides referenced here are available at researchvials.com, with 98%+ purity, third-party COAs, and USA-based cold-chain shipping.