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Peptide science, written by the lab that tests them.
Independent reference articles on how peptides are made, purified, characterized, and verified. We focus on chemistry and analytical method — we do not publish dosing, prescribing, or clinical guidance.
- Manufacturing · 11 min
Peptide synthesis: how SPPS actually works
Solid-phase peptide synthesis from resin loading through global deprotection — and why every coupling cycle is a chance to introduce impurities.
Read article - Purification · 9 min
Peptide purification by reverse-phase HPLC
How crude peptide is separated from deletion sequences, truncations, and oxidized analogs using preparative RP-HPLC, gradient design, and counter-ion exchange.
Read article - Analytical · 12 min
Characterizing a peptide: HPLC, LC-MS, AAA, NMR
The four assays that together establish identity, purity, content, and structure — what each one measures, what it cannot, and how they corroborate.
Read article - Failure modes · 10 min
Common peptide impurities and where they come from
Deletion sequences, truncations, racemization, oxidation, deamidation, dimerization, and residual TFA — what causes each, how it shows up on chromatograms, and what it means for end use.
Read article - Stability · 8 min
Peptide stability and storage: a practical primer
Lyophilized vs. reconstituted stability, cold-chain reality, freeze-thaw, light and oxygen sensitivity, and how stability is actually measured in a regulated lab.
Read article - Verification · 9 min
How to read a peptide Certificate of Analysis
Walk through every section of a peptide COA — identity, purity, content, residual solvents, endotoxin, counter-ion — and learn which numbers actually matter.
Read article - Verification · 7 min
Why third-party peptide testing matters
Why an independent lab — one that does not manufacture or sell the peptide — is the only credible source of identity, purity, and content data for a research peptide batch.
Read article - Buyer's guide · 8 min
How to spot a trustworthy peptide supplier
A buyer-side checklist for evaluating peptide vendors: transparency of methods, batch-level traceability, independent verification, and the small details that separate a credible supplier from a confident-looking one.
Read article - Verification · 7 min
How to tell if your peptide is actually third-party tested
Third-party tested is one of the most overloaded phrases in the research peptide market. The buyer-side diagnostic: what the claim has to mean, what proof has to look like, and how to spot a marketing claim dressed up as one.
Read article
Editorial stance
What you will and will not find here
CertikLabs Learn covers peptide chemistry, manufacturing, analytical methods, and verification. Where a peptide's mechanism of action is well-established in the published literature, we summarize it factually with citations.
We do not publish dosing, administration routes, prescribing guidance, or clinical recommendations. Peptides discussed here are research and pharmaceutical reference compounds. Anything intended for human use must be obtained, prescribed, and administered by a qualified, licensed clinician.