Reference information only. Therapept does not sell peptides and does not provide medical advice.Research-use notice
Guides
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
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 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
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
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
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
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
