# What "Lab-Grade" Actually Means in the Literature > Clean Peptides Lab — Research Peptide Fundamentals — Research Peptide Fundamentals: what lab-grade actually means for GHK-Cu, ipamorelin and tesamorelin. A data-forward literature desk on purity, testing and quality signals, cited claim by claim. **RESEARCH PEPTIDE FUNDAMENTALS** A data-forward reading room for GHK-Cu, ipamorelin and tesamorelin — the purity thresholds, testing methods and quality signals researchers rely on, with every number traced back to its source. ### [GHK-Cu](/ghk-cu) The lead compound on this desk — a copper-binding tripeptide with the deepest published dataset of the three, from 1988 fibroblast work to a 2025 delivery-science review. ### [Ipamorelin](/ipamorelin) A selective growth-hormone secretagogue whose single Phase 2 human trial missed its primary endpoint — a useful case study in reading a thin evidence base honestly. ### [Tesamorelin](/tesamorelin) The one FDA-approved compound in this set, with a real regulatory dossier, an NDA number and a 2026 meta-analysis pooling five randomized trials. ## The short version Clean Peptides Lab reads the published research on three peptides — GHK-Cu, ipamorelin and tesamorelin — and reports what the literature actually says about how each one is studied, tested and judged for quality. This site does not run assays, hold a certification, or sell anything. It is a *reading desk*, not a laboratory, despite the name. The angle here is **lab-grade** — a term used loosely across the peptide market to mean "high purity" or "pharmaceutical quality." In the published record, it is a fuzzier idea than the marketing suggests: it usually points to *analytical* purity (how clean a batch measures on chromatography), not regulatory approval, and the two are frequently confused. This desk walks through what purity, testing and quality signals actually mean for each compound, using only numbers that trace back to a cited source. None of the three pages that follow recommend a human dose. Each reports what a study measured, in the species and setting the study used. ## Purity, testing and quality signals — reading past the marketing "Lab-grade" is not a regulated term. No agency defines a threshold that a supplier must clear to use it, which is precisely why it shows up on product pages with almost no verifiable meaning attached. What the peer-reviewed literature actually measures is narrower and more useful: analytical **purity** (typically by high-performance liquid chromatography, expressed as a percentage of the intended peptide relative to degradation products and byproducts), **identity confirmation** (mass spectrometry matching the expected molecular formula), and, for compounds with a real clinical program, **pharmaceutical-grade manufacturing** under regulatory oversight. Those are three different claims, and the compounds on this desk sit at three different points on that spectrum. Tesamorelin is an FDA-approved drug product, meaning its manufacturing is subject to regulatory quality-control requirements that a research-only compound is not. GHK-Cu's therapeutic literature is almost entirely topical-cosmetic, where ingredient-grade Copper Tripeptide-1 has a long safety record but is not held to a drug-manufacturing standard. Ipamorelin has never been approved as a drug anywhere; its only Phase 2 human trial used investigational material manufactured for that specific study, not the research-grade product sold online today. The honest reading: a chromatography certificate can tell a reader that a specific batch was mostly what it claimed to be on the day it was tested. It cannot substitute for a regulatory approval, and it says nothing about long-term human safety. Community and vendor claims of "lab-grade" or "99% pure" are not, by themselves, verifiable from outside — this desk treats them as marketing language unless a specific study is cited. ## What are research peptides? Peptides are short chains of amino acids — smaller relatives of the proteins that make up living tissue. The three compounds covered here are structurally unrelated to each other: GHK-Cu is a three-amino-acid copper complex first isolated from human plasma, ipamorelin is a five-amino-acid growth-hormone secretagogue, and tesamorelin is a 44-amino-acid analogue of a full human hormone. What groups them on this site is not chemistry but the *question a reader asks about them*: what does the published evidence actually establish, and how does a reader tell a well-supported claim from an inferred one. Term sold as a "research chemical" or "research peptide" typically means material intended for laboratory use, outside any approved human indication. Tesamorelin is the exception — it carries a genuine FDA-approved indication, discussed on its own page. Research-grade material for any of the three, purchased from an unregulated supplier, is not subject to the same identity and purity assurance as an approved pharmaceutical, which is exactly the quality question this hub exists to unpack. ## How the three compare on the evidence ladder GHK-Cu carries the widest dataset — seven cited sources spanning 1988 fibroblast work through a 2025 delivery-science review [1][2][3][4][5][6][7] — but almost all of the strongest human evidence is topical and cosmetic, not systemic. Ipamorelin has the thinnest human record: a single Phase 2 randomized trial that missed its primary endpoint [10] and one small pharmacokinetic study [11], with the rest of its profile drawn from rodent and cell data. Tesamorelin sits apart with a genuine FDA approval, a 2026 meta-analysis pooling five randomized trials [13], and a dedicated liver-safety monograph [14]. Each compound's own page walks through its mechanism, its findings, its safety literature and where it fits this hub's purity-and-testing frame in more depth. The [comparison page](/compare) lines the three up side by side on evidence maturity, regulatory status and what each is actually studied for. --- Clean Peptides Lab reads the purity, testing and quality-signal literature on GHK-Cu, ipamorelin and tesamorelin; it runs no assays, holds no certification, and is a reading desk, not a laboratory.