Purity and peptide content answer different questions on a certificate of analysis. Read each COA one test at a time, keep the method, unit, specification, and qualifiers attached to every value, and confirm that the report matches the product SKU and batch you are checking. A purity percentage is not net peptide content, a catalog size is not a measured fill, and a missing row is not a pass.
Purity, peptide content, and fill are different rows
The published guide on how to read identity, purity, fill and endotoxin results is site editorial guidance for reading catalog and batch records, not independent scientific evidence. It tells you to read a COA one test at a time. Identity, purity, fill, and endotoxin results answer different questions. Keep the reported method, unit, specification, and qualifiers attached to each value. Do not replace a less-than sign with zero or treat a missing result as a pass.
The row names below come from the published RT10 example in that guide. Different reports can contain different tests. Read the terminology used by the specific report rather than forcing every record into the same labels.
| Row | What to read | What not to infer |
|---|---|---|
| Mass spectrum / identity | Recorded mass and method against the stated specification | That every other test passed |
| Purity | The reported percentage and analytical method | That the same percentage is net peptide content |
| Peptide content | Its separate result and definition in the report | That it is the same as nominal fill |
| Actual fill | Measured quantity, units and nominal specification | That a label is itself a measured result |
| Bacterial endotoxins | Result, qualifier, units and stated limit | That a less-than result means zero or proves sterility |
Those reading rules stop at the report itself. Do not treat a purity percentage as net peptide content, or a catalog label as a measured fill.
Preserve qualifiers and units. A result written as "less than" a threshold states a bound, not an exact measured value of zero. A value in mg cannot be compared directly with a percentage or a result in EU/mg. If multiple components are measured in a blend, retain the component name beside each result.
The summary makes reported values easier to read, but the original document contains the complete context and is the reference if a summary appears inconsistent. Contact support about any discrepancy. Neither a purity percentage nor a set of passing results establishes suitability for human or animal use.
Match the SKU, batch, and certificate
A SKU identifies a listed product variant. A batch number identifies a batch record. Use both when locating a COA: a product name by itself is not enough when several sizes or batches exist, according to the guide on how to find a COA by SKU and batch number.
| Identifier | What to compare | Example |
|---|---|---|
| Product | Exact product or blend name | Retatrutide |
| SKU | Listed size and pack variant | RT10 |
| Batch | The batch in the document | R3Y0BM87SYEP |
| Certificate | The particular issued report | QC-2026-CMJBJX7R8G |
Open the product page, select the SKU, and read the matching certificate panel. Selecting a SKU updates the report without moving your viewing position. Match the original document before relying on it.
Avoid two common mismatches. A report for RT5 should not be used as evidence for RT10 merely because both say Retatrutide. Likewise, an older published batch is not evidence of the batch that will be shipped next. Blends are separate products, not interchangeable aliases for their ingredients. Use the complete blend name and SKU; individual ingredient results may appear as separate rows in the report.
When a report is missing, ask support for the exact SKU and batch. A missing public result is not automatically a failed test, and it is not a passed test either. If a previously shared report link is no longer available, ask support for the current documentation rather than substituting a different batch.
Nominal vial size is not peptide content
Read the per-vial size, vials per pack, and pack price as three separate fields. A product label such as "10 mg × 10 vials" describes ten vials with a nominal size of 10 mg each. It is not a single vial containing 100 mg.
The listed example for Retatrutide SKU RT10 is a nominal size of 10 mg per vial, 10 vials per pack, and a nominal sum of 100 mg across one pack (per-vial size versus pack quantity). The sum is label arithmetic, not an analytical measurement. Actual fill and peptide-content measurements belong to the particular batch report. For a blend, check whether the stated size is combined and read the separate ingredient information.
If your quotation or product documentation uses a different packaging description, ask support to reconcile it before relying on the calculation.
Checklist: units, rows, and batch match
- Match the exact product or blend name, SKU, batch number, and issued certificate.
- Read purity as the reported percentage and analytical method only.
- Read peptide content as its own result and definition; do not copy the purity percentage onto that row.
- Read actual fill as measured quantity, units, and nominal specification; do not treat the catalog label as a measured result.
- Keep every qualifier, unit, and component name attached. A less-than bound is not zero; mg is not a percentage; EU/mg is not mg.
- Do not treat a missing row as a pass or as a fail.
- If a summary conflicts with the original document, use the original and contact support.
- Confirm per-vial size, vials per pack, and pack count separately before any quantity arithmetic.
- Do not use an RT5 report as evidence for RT10, or an older published batch as evidence of the next shipment.
Frequently Asked Questions
Is purity the same as peptide content on a COA?
No. Read purity as the reported percentage and analytical method. Do not infer that the same percentage is net peptide content. Peptide content is a separate result with its definition in the report.
Can a Retatrutide RT5 report stand in for RT10?
No. A report for RT5 should not be used as evidence for RT10 merely because both say Retatrutide. Match the exact SKU and the batch in the document.
Does a less-than result mean zero?
No. A result written as "less than" a threshold states a bound, not an exact measured value of zero. For bacterial endotoxins, a less-than result also does not prove sterility.
Is the 100 mg pack total for RT10 a measured peptide-content value?
No. In the listed RT10 example, 10 mg is the nominal size per vial, 10 is the vial count, and 100 mg is the nominal sum across one pack. That sum is label arithmetic, not an analytical measurement. Actual fill and peptide-content measurements belong to the particular batch report.
Explore Further
Browse our research peptide catalog and review third-party lab reports & COAs for published batches.
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Research use only. The information above is provided for educational and laboratory research purposes only. The compounds discussed are not approved for human or veterinary use, diagnosis, treatment, or the prevention of any disease. Nothing here is medical advice.