Glow Peptides · Research Journal
TB-500 Certificate of Analysis: How to Verify a Research Lot
Glow Peptides Research Team · 2026-09-18
For research use only. Not for human or veterinary use, diagnostic use, or in any therapeutic application.
A TB-500 certificate of analysis has one job that is harder here than for most research materials: establishing that the container holds the sequence the label names. TB-500 is a code name rather than a chemical description, material circulates under more than one name, and a listing title is not evidence of anything. That makes the identity result the field carrying the weight on this document, and it makes matching one vial to its own published record the only check that settles the question. This guide sets out what a TB-500 certificate should show, how to run that match string by string, and where the document's authority ends. Every lot cited below opens a published record in the COA directory.
The general reading of the document — which fields exist and what each one is for — is covered in certificates of analysis explained, and the per-compound index of published lot records is the fastest route to the right document for any material in the catalog. The material overview sits at TB-500. This page is narrower: one compound, the three kinds of record it appears in, and the traps that belong to it rather than to certificates in general.
TB-500 is a code name, not a chemical description
Start with what makes this compound's paperwork distinctive. A systematic chemical name carries information: read it carefully and it constrains what the substance can be. A code name carries none. It is a label assigned by convention, and conventions are adopted by whoever chooses to adopt them. Nothing about the string TB-500 tells you what is in a vial, and nothing prevents it being printed on a vial holding something else.
Short code names are ordinary in research chemistry, and this is not a complaint about the convention. It is a statement about what a name can do in a verification chain: it gets you to the right shelf, not the right molecule.
Typographic variants are not a problem
The same name is written TB-500, TB500 and TB 500 across listings, labels and documents. Hyphenation and spacing are typesetting choices, not material differences, and a mismatch of that kind on a certificate is not a finding. Normalise it and move on to the fields that mean something.
Different names are a real problem, and a document is the only fix
Separately from typesetting, material in this category is listed in the market under names that are not simply spellings of one another. Whether two such names point to the same sequence is not something a listing can settle, and it is not something this article will assert on either side. Product titles and category pages are not analytical statements; they are words chosen by a seller. The gap between a name on a page and a sequence in a vial is exactly what a certificate exists to close, which is why the identity result deserves more of your attention here than on a compound with one settled name.
One point of chemistry explains why the naming is unsettled at all. TB-500 is a short synthetic sequence rather than a full-length protein: it is assembled to a specification rather than extracted from anything, so what a batch is depends on what was specified for the run and what the chemistry produced. The mechanics of that assembly, and why it is where impurities enter, are in peptide synthesis and purity. The broader naming argument, worked through on a different material, is in peptide names and why they multiply.
Why identity outranks purity on this document
Most readers open a certificate and go straight to the purity percentage. On a compound with one settled name that is defensible. Here it inverts the order of importance.
The two results come from two instruments answering different questions, and they are not substitutes. Reverse-phase HPLC separates a sample's components in a solvent gradient and reports the target peak's area against total detected peak area. It answers how much of what the detector saw is the compound of interest. It does not name the peak. A well purified sample of an entirely different sequence produces one clean peak and an excellent percentage, and nothing in that chromatogram objects.
Mass spectrometry answers the other question. It compares observed mass-to-charge against the mass computed from a sequence, which ties the vial's contents to one specific sequence irrespective of what any listing, label or invoice called it. That is why a documented mass beats a product title, and why here it also outranks a purity figure. A high percentage attached to an unidentified peak is a statement about tidiness, not about contents.
One refinement is worth holding on to. An identity result is a comparison against a claimed target, so the claim has to be visible. A certificate reporting that identity was confirmed, without saying what it was confirmed against, has told you only that the observed mass matched something the laboratory was handed. The strong version names the target. Read that field first, purity second.
The published TB-500 vial lot
Abstractions are easier to trust against something real. One released single-component TB-500 lot is published: 260312HPTB10, catalog code TB10, 10 mg total peptide content per vial, with its record at /coa/d1c4a4ba-10d6-400a-ba58-c080f5ad11ad and the material page at TB-500. It opens without an account or a request.
The lot string is structured rather than random. Learning its grammar is worth a minute for one reason only: so you can tell a lot number from a catalog code and notice when you have been handed the second in place of the first. It is not a verification method, because anyone can print a string that follows a convention.
| Element | In 260312HPTB10 | What it identifies |
|---|---|---|
| Date element | 260312 | A six-digit YYMMDD date attached to the run |
| Site code | HP | A short code for the production site. QL, HP, ZJ and SXH all appear across released lots; what they stand for is not published, so read them as opaque tokens rather than guessing |
| Catalog code | TB10 | The material and the vial's total peptide content — TB for TB-500, 10 for 10 mg |
| Batch sequence | not present | Distinguishes runs made close together. Present on some lots, absent on others; absence is not a defect |
Punctuation varies between production runs, which is the commonest transcription trap in the exercise. Some released lots are written unbroken and others carry hyphens and a trailing sequence number; both forms are well-formed. When a lookup returns nothing, the usual cause is a character misread off a small label — 0 against O, 1 against I — or hyphens added from memory rather than copied from the vial. The full decomposition rules, including the -C suffix that marks a capsule format rather than a vial, are in lot codes and catalog codes explained.
One clarification applies everywhere a milligram figure appears in this article, including the 10 in TB10. It is the total peptide content of the sealed container as analysed, and nothing more. It is not a quantity of anything to be used and it does not correspond to any period of time. It exists on the certificate for the same reason the lot number does: so the document can be tied to one physical object rather than to a product line.
One number, three different meanings
TB-500 appears in the published records in three roles, and the printed milligram figure means something different in each. Almost every misreading of a TB-500 document traces back to this.
| Record | Catalog code | Components | What the printed figure tells you | Certificate |
|---|---|---|---|---|
| 260312HPTB10 | TB10 | One: TB-500 | 10 mg total peptide content for the vial. On a single-component container the total and the component are the same quantity | View record |
| 260410HPWV20 | WV20 | Two: BPC-157 and TB-500, sold as Wolverine | Not the whole answer. The material page states 20 mg for the vial while the lot record shows 10 mg, because those two numbers describe different things. Open the certificate and read the per-component results | View record |
| 260320HPKL80 | KL80 | Four: BPC-157, TB-500, GHK-Cu and KPV, sold as KLOW | 80 mg total peptide content across the whole vial. It is never the amount of any single component, and it cannot be divided into components by arithmetic | View record |
Read down the last column and the pattern is plain: the printed figure is most informative where you need it least, and least informative where readers lean on it hardest.
The combination lot that makes the case
The middle row is the strongest teaching example in the published set, because the two numbers printed around that vial do not describe the same thing.
The material page states a concentration of 20 mg for the vial. The public lot record for 260410HPWV20 shows 10 mg. Both figures are published and neither is the whole answer on its own: the 20 mg is the total peptide content of the sealed vial across both named components, and the record's 10 mg is a per-component figure rather than a figure for the container.
The general principle holds whether or not any particular pair of figures happens to agree. On a container holding more than one compound, a single printed milligram figure cannot tell you on its own whether it describes one component or the combination. The figure is one number and the question has at least two answers. No amount of squinting at the label resolves it, and no arithmetic on the code does either.
Which puts the catalog code in its place. A code is a stock key: it exists so that an order, a shelf, a label and an invoice can refer to the same line item, and it was never drafted as a specification. On single-component vials its numeric part happens to coincide with the total peptide content, which is convenient and also what makes it hazardous. A reader who has learned to infer contents from the code on a TB10 vial carries the habit onto a combination code, where the inference has no support.
The resolution is the document. Open /coa/ee662738-2ae4-4891-9dde-b65e36291331 and read what the laboratory reported for each component: an identity result for BPC-157, an identity result for TB-500, and a purity result attributable to each of them by name. Per-component results are a statement about contents produced by measurement. A code is a filing decision. When the two appear to disagree, only one of them was measured. One certificate covers the lot, but on two components it has to carry two sets of results, and a single unattributed purity number has not answered the question whatever that number is.
TB-500 inside a four-component blend
The same logic scales, and it gets less forgiving as components are added. Lot 260320HPKL80, catalog code KL80, is the KLOW blend: BPC-157, TB-500, GHK-Cu and KPV in one vial at 80 mg total peptide content, with its record published at /coa/5aacb884-dc47-4c0e-913c-8f2b5fe3db35.
Two statements about that 80 mg need making without softening. It is the total across the vial, and it is not the amount of TB-500 in it. Dividing eighty by four derives nothing: the components of a blend are not obliged to be present in equal amounts, and nothing on the label authorises that assumption. The certificate is the only place the per-component answer lives, and it is public.
What the certificate has to do on a four-component lot follows from what the instruments do. Each component is a separate compound, so each registers as its own chromatographic peak, and each peak's area is the purity statement for that component and no other. A single figure for the mixture as a whole would not describe anything measurable. Identity works the same way: the mass of each component has to be found, not just the mass of the one the blend is best known for. The published specification of ≥99.2% is a floor, applied per component rather than to the vial as an average.
The practical consequence is that a blend certificate is a longer document than a single-compound certificate and should look like one. If four components produce one line of results, that is a finding about the document rather than a sign of efficiency.
What a usable per-component result looks like
Pulling that together: here is what has to be present before a TB-500 record counts as evidence about the vial in your hand.
- A lot number that is the string on your label. Character for character, hyphens included. Everything else on the page is a statement about some other material until this matches.
- An identity result naming its target. Confirmed by mass, against a stated sequence. On this compound that is the field that converts a name into a fact.
- A purity result with the method beside it. Reverse-phase HPLC, with the conditions identified. A percentage with no method behind it cannot be compared, reproduced or challenged.
- One result set per component. On a combination or blend lot, every component named and every result attributable to a named component. Two compounds need two sets, four need four.
- A named laboratory and a report date. Named so the independence can be checked, dated so the analysis can be placed against the batch.
- Attributes reported as reported. Where a lot's report includes an additional attribute, it appears on that lot's certificate and applies to that lot. Absence means it was not part of that report, not that something failed.
Red flags on TB-500 documentation elsewhere
These are the patterns worth refusing. They apply to any seller, and several belong to this compound rather than to certificate hygiene in general, because the naming situation invites them.
- The compound is named only in the document title. A heading that says TB-500 above a results table that never states what identity was confirmed against has restated the label and stopped.
- The name on the document is not the name on the listing. Sometimes that is a harmless typographic variant. Sometimes it is a different name entirely, offered without explanation, and then the document and the product have not been connected at all.
- Identity confirmed against an unstated target. A tick in a box marked identity, with no indication of the sequence compared. The form of a result without the content of one.
- No identity result at all. A strong purity figure on its own has established that something in the vial was pure.
- Contents inferred from the catalog code. If the only account of what is in a combination vial is arithmetic on a stock key, no analysis has been cited.
- One unattributed purity figure on a multi-component vial. Components register as separate peaks. A number belonging to no named component describes nothing.
- A blend document covering only the headline component. The best-known component is not the vial. The others either have results or they do not.
- Documentation only on request. Verification that depends on a seller's cooperation is not independent, and the dependency bites at exactly the moment you have a question.
Where the document's authority ends
A per-lot certificate is the strongest routine evidence available for research material, and it is still a bounded claim. Stating the boundaries alongside the strengths is what separates a record from a sales document.
- It describes one batch, measured on one date. Assembly and purification are repeated per run and the impurity profile belongs to the run. A record for one TB-500 lot says nothing about the next one, and it is a record of a measurement rather than a warranty extending forward in time.
- It settles one vial's sequence, not the market's vocabulary. A mass result tells you what is in this batch. It does not adjudicate which names in circulation refer to which sequences.
- It says nothing about another seller's vial with the same name printed on it. This is the trap the naming situation sets. A certificate is evidence about the batch it names and about no other material sharing a label.
- It does not cover what happened after testing. Conditions — temperature, light exposure, whether the container stayed sealed — sit outside what any certificate from any seller can speak to.
- It speaks only to composition. It establishes what was measured and nothing wider.
How verification works here
Every released lot is analysed by an independent laboratory — Freedom Diagnostics, named on the certificates themselves — using reverse-phase HPLC for purity and mass spectrometry for identity. The published specification is a floor of ≥99.2%, the number every released lot has to clear, and on combination and blend material it is applied per component rather than to the vial as a whole.
The records are published per lot and open without a gate. The COA directory lists them, the QR code on a vial opens the record for that vial's own lot, and each material page links the lots published for it — TB-500, the BPC-157 and TB-500 combination, and the four-component KLOW blend. No account, no request and no support conversation on any of those routes, which is deliberate: a record you can open without asking is a record that existed before you asked.
Two limits belong in the same paragraph as those claims. Analytical results are specific to one lot and to the method used to produce them, and a certificate describes material as analysed on a date, which means it does not extend forward through storage and handling — no certificate from any seller does. Within those limits, on a compound whose name settles less than readers expect, a published per-lot record with a named target sequence and per-component results is the only thing connecting a name on a label to the contents of a container.
Frequently asked questions
What should a TB-500 certificate of analysis show?
Five things carry the weight: a lot number matching the vial character for character, an identity result confirmed by mass spectrometry against a stated target sequence, a purity result by reverse-phase HPLC with the method named beside it, one result set per component on any multi-component vial, and a named laboratory with a report date. On this compound the identity field matters most, because the name on a listing settles less than readers assume and only a documented mass ties a vial to one sequence.
How do I confirm that a TB-500 COA matches my vial?
Compare three strings: the lot number printed on the label, the lot number on the certificate, and the lot number in a published record you reached without asking the seller. All three must be identical, hyphens included. Punctuation varies between production runs, so copy from the vial rather than from memory, and expect the usual misreads of 0 against O and 1 against I. Two matching out of three is a discrepancy to resolve before anything else on the document means anything.
What does TB10 mean on a TB-500 label?
It is the catalog code: a short compound abbreviation followed by the total peptide content of the vial in milligrams. TB stands for TB-500 and 10 for 10 mg total peptide content, which is a specification of what the sealed vial holds and not a quantity of anything to be used. A -C suffix marks the capsule format instead of a vial. The code also appears inside the lot number, as in 260312HPTB10, which gives you a second check against the printed material name.
Why does identity matter more than purity on a TB-500 certificate?
Because purity cannot name the peak it measures. A well purified sample of a different sequence produces one clean chromatographic peak and an excellent percentage, and nothing in that result objects. Mass spectrometry compares observed mass against the mass computed from a sequence, which ties the vial to one specific sequence regardless of what the listing called it. TB-500 is a code name rather than a chemical description, and material circulates under more than one name, so the identity field is where the real question is decided.
Does the mg figure on a blend vial tell me the TB-500 content?
No. On the four-component KLOW lot the 80 mg is the total peptide content across the whole vial, not the amount of any single component, and dividing it by the number of components derives nothing. On a two-component combination a single printed figure cannot even say whether it describes one component or the pair, which is why the catalog code is a stock key and not a specification. The per-component results on the published certificate are the only statement of what the vial holds.