Testing & documentation
How to Verify a Peptide Certificate of Analysis
Reading the fields is step one. Verification is whether the lot, the laboratory and the lookup still join. A truthful PDF can fail that join.
12 Sept 2026 · 8 min
Guides
Learn
How to read the documentation this sector produces — what each analytical method actually shows, what a certificate of analysis can and cannot support, and how to evaluate a supplier without relying on their own claims.
Testing & documentation
HPLC Purity vs Net Peptide Content
Chromatographic purity is a share of detector response. Net peptide content is a share of mass. They answer different questions and are often not both present.
12 Sept 2026 · 7 min
Testing & documentation
LC-MS Identity Verification on Peptide Certificates
Mass spectrometry supports identity when an observed value is reported against a calculated mass. “Conforms” without a number is a verdict with the work omitted.
12 Sept 2026 · 7 min
Testing & documentation
Lot-Level Documentation
A certificate is about a sample. Lot-level documentation is the join from that sample to a production run and to the container you can hold.
12 Sept 2026 · 6 min
Testing & documentation
Reading Analytical Reports Beyond the Headline Percentage
The useful part of an analytical report is the method, the chromatogram or spectrum, the dates, and the fields that are empty.
12 Sept 2026 · 6 min
Research literacy
Understanding Peptide Study Design
Study design is the first filter on a peptide paper. Species, n, endpoint and control structure decide what the paper can support — not the abstract’s adjectives.
12 Sept 2026 · 8 min
Research literacy
Animal Studies vs Human Studies in the Peptide Literature
Most grey-market peptide claims lean on animal models. Independent 2026 sports-medicine reviews of those compounds describe human trials as scarce and weakly controlled.
12 Sept 2026 · 7 min
Research literacy
What “In Vitro” Means
In vitro means in glass: a cell, enzyme or biochemical system. Human cells in a dish are still an in-vitro study. They are not a clinical trial.
12 Sept 2026 · 5 min
Research literacy
Interpreting Peptide Research Without Turning It Into a Protocol
The honest reading of a peptide paper stops at population, endpoint and limitations. Crossing into what a reader should take is a different product, and not this one.
12 Sept 2026 · 6 min
Research literacy
Why Evidence Quality Differs Across Peptides
Approved peptide drugs have Phase 3 programmes and labels. Many research-chemical names have rodent literature and a withdrawn compounding nomination. That is a difference in the public record, not a ranking Therapept invented.
12 Sept 2026 · 6 min
Regulatory
503A, 503B and Compounding Categories
Pharmacy compounding in the United States is not FDA approval. Category 1, 2 and 3, 503A and 503B, and a PCAC vote are different instruments.
12 Sept 2026 · 8 min
Regulatory
How Regulatory Status Differs by Compound
The library contains FDA-approved drugs, discontinued approvals, active Category 2 substances, and unapproved names with withdrawn compounding nominations. Status is per compound.
12 Sept 2026 · 6 min
Supplier research
Peptide Supplier Documentation Standards
The standard is boring: lot-specific reports, a named laboratory, method, and a lookup that does not depend on the seller. Completeness is not a recommendation.
12 Sept 2026 · 7 min
Methodology
How Therapept Directories Are Built
Every factual claim carries a source. Unknown is a value. Provenance is rendered. Directories are not ranked.
12 Sept 2026 · 6 min
Testing & documentation
How to Read a Peptide Certificate of Analysis
A certificate of analysis is a record of specific tests run on a specific lot. Here is what each field means, which fields are load-bearing, and the four ways a COA can be technically accurate and still tell you very little.
3 Sept 2026 · 9 min
Testing & documentation
HPLC vs LC-MS: What Each Test Actually Tells You
HPLC and LC-MS are not competing methods or tiers of the same measurement. They answer different questions — how much of one thing, and which thing — and a purity figure without an identity confirmation is a known blind spot.
3 Sept 2026 · 8 min
Supplier research
How to Evaluate a Research Peptide Supplier
Most supplier comparisons rank marketing. This is a checklist of things a supplier either can or cannot produce on request — and the distinction between evidence, self-reported claims, and design choices that look like evidence.
3 Sept 2026 · 10 min
Regulatory
What “Research Use Only” Actually Means
The phrase is treated as a legal shield across the sector. Its actual regulatory footing is much narrower than that, and what a product is marketed for matters more to regulators than what the label says.
3 Sept 2026 · 7 min
Testing & documentation
How Peptide Batch and Lot Traceability Works
A lot number is only useful if it resolves to something. This covers what a lot actually is, what a working traceability chain looks like end to end, and the difference between a lookup tool and lookup theatre.
3 Sept 2026 · 7 min
Testing & documentation
A Guide to Third-Party Peptide Testing
Independent testing is the only way to check a supplier's documentation rather than trust it. What to order, how to choose a laboratory, what it costs you in sample and time, and the limits of a single result.
3 Sept 2026 · 8 min