Verifying PE-22-28 starts with four separate identifiers: the product name, the listed SKU, the per-vial size and pack quantity, and the batch certificate that belongs to that SKU. The public listing records PE5 at 5 mg per vial with 10 vials per pack and PE10 at 10 mg per vial with 10 vials per pack as public listed variants only (at most 40), not as an exhaustive catalog. Published certificates of analysis apply only to the named batch and SKU, not to every future shipment (PE-22-28 product listing).
Match the listed SKU, vial size, and pack quantity
The public product page records PE-22-28 with CAS number 1801959-12-5, molecular formula C35H55N11O9, and molecular weight 773.9. Those catalog fields describe the listed compound; they are not a substitute for a batch report (PE-22-28 product listing).
The two SKUs in that listing are:
| SKU | Nominal size per vial | Vials per pack |
|---|---|---|
| PE5 | 5 mg | 10 |
| PE10 | 10 mg | 10 |
Site editorial guidance—not independent scientific evidence—treats per-vial size, vials per pack, and pack price as three separate fields. A 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 arithmetic sum across a pack is label arithmetic, not an analytical measurement. Actual fill and peptide-content values belong to the particular batch report (per-vial size versus pack quantity).
Match the exact product name and SKU code, then check the per-vial size and unit and the number of vials per pack. If documentation uses a different packaging description, the site guide advises asking support to reconcile it before relying on the calculation (per-vial size versus pack quantity).
Locate the COA by SKU and batch, not by product name alone
A SKU identifies a listed product variant. A batch number identifies a batch record. Use both when locating a COA: the product name PE-22-28 by itself is not enough when more than one size or batch exists (how to find a COA by SKU and batch).
A report for PE5 should not be used as evidence for PE10 merely because both say PE-22-28. Likewise, an older published batch is not evidence of the batch that will be shipped next. 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 (how to find a COA by SKU and batch).
Two published PE-22-28 batch pages illustrate the SKU-to-certificate trail:
| Identifier | PE5 example | PE10 example |
|---|---|---|
| SKU | PE5 (5 mg) | PE10 (10 mg) |
| Batch | YMEOOZ2LQ32C | I1QNA4SSFMNX |
| Certificate | QC-2026-NT5ZASAWPC | QC-2026-F4VV23J2J7 |
| Laboratory | Stand Science & Technology Pharmaceutical (Qingdao) Co., Ltd. (Stand Group) | Stand Science & Technology Pharmaceutical (Qingdao) Co., Ltd. (Stand Group) |
| Test date | 2026-04-12 | 2026-04-12 |
Those rows are recorded results for those batches only. They are not evidence of clinical suitability or of every PE-22-28 batch (PE5 batch YMEOOZ2LQ32C; PE10 batch I1QNA4SSFMNX).
What the published PE5 and PE10 COAs record
Each published record includes a summary panel and line-item tests. Preserve the analyte, method, units, qualifiers, and determinations as written. Unknown fields are not zero, pass, or evidence of absence.
For batch YMEOOZ2LQ32C (SKU PE5, certificate QC-2026-NT5ZASAWPC), the summary reports identity 773.4 Da, purity 98.6 %, weight 5.61 mg, and endotoxin <3 EU/mg. The line items, all recorded as Pass for analyte PE-22-28 PE5, are:
- Appearance, Visual: specification White or almost white loose powder; result White loose powder
- Mass spectrum, MS: specification 773.9 +/- 1.0 Da; result 773.4 Da
- Purity, HPLC: specification NLT 98.0 %; result 98.6 %
- Peptide content, HPLC: specification NLT 90.0 %; result 91.6 %
- Actual fill, Gravimetric: specification 5 mg; result 5.61 mg
- Water content, Karl Fischer: specification NMT 8.0 %; result 4.0 %
- Bacterial endotoxins, LAL (gel-clot): specification NMT 10 EU/mg; result <3 EU/mg
For batch I1QNA4SSFMNX (SKU PE10, certificate QC-2026-F4VV23J2J7), the summary reports identity 773.1 Da, purity 99.6 %, weight 11.14 mg, and endotoxin <3 EU/mg. The line items, all recorded as Pass for analyte PE-22-28 PE10, are:
- Appearance, Visual: specification White or almost white loose powder; result White loose powder
- Mass spectrum, MS: specification 773.9 +/- 1.0 Da; result 773.1 Da
- Purity, HPLC: specification NLT 98.0 %; result 99.6 %
- Peptide content, HPLC: specification NLT 90.0 %; result 90.7 %
- Actual fill, Gravimetric: specification 10 mg; result 11.14 mg
- Water content, Karl Fischer: specification NMT 8.0 %; result 5.5 %
- Bacterial endotoxins, LAL (gel-clot): specification NMT 10 EU/mg; result <3 EU/mg
Nominal catalog size and gravimetric actual fill are different numbers. PE5 is listed at 5 mg per vial; the YMEOOZ2LQ32C fill result is 5.61 mg. PE10 is listed at 10 mg per vial; the I1QNA4SSFMNX fill result is 11.14 mg. Peptide content is a separate HPLC result (91.6 % for the PE5 batch; 90.7 % for the PE10 batch). Those values stay with the named batch.
Provider verification links on these records were not independently fetched. Seeing a link on a batch page is not, by itself, proof that a provider record is currently valid (how to verify a CertiPeptide COA).
Verification sequence and remaining gaps
Site editorial guidance—not independent scientific evidence—suggests this sequence:
- Read the product and SKU from the product page or order documentation.
- Find the batch. If the allocated batch is not stated, ask support to confirm it.
- Open the batch page and check the certificate number, sample identity, test date, and listed laboratory.
- Open the original report and compare the values and units with the summary.
- Follow the report-specific verification link. If the provider requests login or the record cannot be confirmed, resolve that with the provider or support before treating verification as complete.
Do not substitute a report for a similar product or a different size. Send support the SKU, batch number, and the specific difference. A published report does not mean every order receives that batch; confirm the batch allocated to the order separately (how to verify a CertiPeptide COA).
Checklist
- Product name matches PE-22-28.
- SKU matches a listed variant (PE5 or PE10 in the public listing).
- Per-vial size is 5 mg or 10 mg as applicable, with 10 vials per listed pack.
- Batch number on the allocation matches the COA batch page.
- Certificate number and test date match the original report.
- Analyte on the COA includes the matching SKU (PE-22-28 PE5 or PE-22-28 PE10).
- Methods, units, and qualifiers (NLT, NMT, <) are copied as written.
- Provider verification, if used, is completed on the original record; a link alone is not confirmation.
Evidence gaps remain. Only two public SKUs are listed here, and that list is not claimed to be exhaustive. Only two published batches are cited, both tested on 2026-04-12 by the same laboratory; they do not describe other lots, other dates, or material that has not yet been allocated. Endotoxin, appearance, and related COA lines are recorded laboratory results for those batches; they are not a sterility, safety, storage, shipping, or use conclusion.
Frequently Asked Questions
Does a PE5 COA cover PE10?
No. A SKU identifies a listed variant. A report for PE5 should not be used as evidence for PE10 merely because both say PE-22-28.
Does a published PE-22-28 report mean every order receives that batch?
No. Confirm the batch allocated to the order separately. An older published batch is not evidence of the batch that will be shipped next.
How should 10 mg × 10 vials be read for PE10?
It describes ten vials with a nominal size of 10 mg each, not a single vial containing 100 mg. The pack sum is label arithmetic, not an analytical measurement.
What if a public PE-22-28 COA is missing?
A missing public result is not automatically a failed test, and it is not a passed test either. Ask support for the exact SKU and batch rather than substituting a different batch.
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.
