To verify an SS-31 listing, start with the exact SKU, then confirm the nominal size per vial, the number of vials in the pack, and the published certificate of analysis (COA) that names that same SKU and batch. A product name by itself is not enough when several sizes exist, and a report for one size is not evidence for another.
Listed SKUs, vial size, and pack quantity
The public SS-31 catalog entry lists CAS number 736992-21-5, molecular formula C32H49N9O5, and molecular weight 639.8. The same page lists three public variants. That list is described as public listed variants only, at most 40, and is not a claim that the list is exhaustive.
| SKU | Nominal size per vial | Vials per pack |
|---|---|---|
| 2S5 | 5 mg | 10 |
| 2S10 | 10 mg | 10 |
| 2S50 | 50 mg | 10 |
Site editorial guidance is to read 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 one pack is label arithmetic, not an analytical measurement. Actual fill and peptide-content measurements belong to the particular batch report (per-vial size versus pack quantity).
Before ordering, match the exact product and SKU, check the per-vial size and unit, check the number of vials per pack, set the number of packs required, and review matching batch records. If a quotation uses a different packaging description, ask support to reconcile it before relying on the calculation.
Published batch COAs for 2S5, 2S10, and 2S50
Each published COA applies only to the named batch and SKU. Provider verification links were not independently fetched. These records are not evidence of clinical suitability or of every batch.
All three published SS-31 reports name Stand Science & Technology Pharmaceutical (Qingdao) Co., Ltd. (Stand Group) and a test date of 2026-06-03 (2S5 batch 7DBZPVKSWKZU, 2S10 batch KLGWX0YTTRY0, 2S50 batch J0Z433P1PZ5F). Appearance used Visual method against “White or almost white loose powder.” Mass spectrum used MS against “639.8 +/- 1.0 Da.” Purity used HPLC against “NLT 98.0 %.” Peptide content used HPLC against “NLT 90.0 %.” Actual fill used Gravimetric measurement against the nominal vial size. Water content used Karl Fischer against “NMT 8.0 %.” Bacterial endotoxins used LAL (gel-clot) against “NMT 10 EU/mg.” Each listed item below was recorded as Pass for that batch only.
| Recorded item | 2S5 batch 7DBZPVKSWKZU | 2S10 batch KLGWX0YTTRY0 | 2S50 batch J0Z433P1PZ5F |
|---|---|---|---|
| Certificate number | QC-2026-V7YLMCKM9J | QC-2026-MA529RB3YK | QC-2026-AXEB4N7NY6 |
| Analyte on the report | SS-31 2S5 | SS-31 2S10 | SS-31 2S50 |
| Appearance | White loose powder | White loose powder | White loose powder |
| Mass spectrum | 639.1 Da | 639.4 Da | 639.3 Da |
| Purity (HPLC) | 99.3 % | 99.2 % | 99.7 % |
| Peptide content (HPLC) | 90.6 % | 92.2 % | 92.5 % |
| Actual fill (Gravimetric) | 5.43 mg (specification 5 mg) | 10.76 mg (specification 10 mg) | 57.32 mg (specification 50 mg) |
| Water content | 4.6 % | 3.3 % | 4.5 % |
| Bacterial endotoxins | <3 EU/mg | <3 EU/mg | <3 EU/mg |
Purity and peptide content are separate HPLC results. Actual fill is a gravimetric result against the nominal vial size; it is not a substitute for peptide content. An unlisted analyte is not zero, not a pass, and not evidence of absence. Endotoxin results are the recorded LAL (gel-clot) values only; they are not a sterility, safety, or suitability conclusion.
Matching SKU, batch, and certificate
A SKU identifies a listed product variant. A batch number identifies a batch record. Use both when locating a COA (how to find a COA by SKU and batch). Open the product page, select the SKU, and read the matching certificate panel. Selecting a SKU updates the report without moving your viewing position. Open the batch’s fixed page to share its results, and match the original document before relying on it.
A practical verification sequence from the site’s COA guide is (how to verify a CertiPeptide COA):
- Read the product and SKU from the product page or order documentation.
- Find the batch in Lab Reports. 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. A verification page may require an account with the report provider; seeing a link alone does not prove that a report is currently valid. 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. A report for 2S5 should not be used as evidence for 2S10 or 2S50 merely because both are labeled SS-31. An older published batch is not evidence of the batch that will be shipped next. A published report does not mean every order receives that batch; confirm the batch allocated to the order separately.
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.
Verification checklist
- Product name is SS-31 on the catalog page and on the COA.
- SKU is one of the listed codes 2S5, 2S10, or 2S50.
- Per-vial size is 5 mg, 10 mg, or 50 mg, with 10 vials per pack.
- Batch number on the order documentation matches the COA page.
- Certificate number, test date, and laboratory match the same record.
- Each analyte, method, unit, qualifier, and determination is copied from that named batch only.
Frequently Asked Questions
Which SS-31 SKUs are listed publicly?
The public catalog lists 2S5 (5 mg per vial, 10 vials per pack), 2S10 (10 mg per vial, 10 vials per pack), and 2S50 (50 mg per vial, 10 vials per pack). That list is public listed variants only and is not a claim that it is exhaustive.
How should I read a pack described as 10 mg × 10 vials?
Read per-vial size and vials per pack as separate fields. That description means ten vials with a nominal size of 10 mg each, not one vial containing 100 mg. The pack sum is label arithmetic, not an analytical measurement.
Can a 2S5 COA be used as evidence for 2S10 or 2S50?
No. A SKU identifies a listed variant and a batch number identifies a batch record. A report for one size should not be used as evidence for another size merely because both are labeled SS-31.
Does a published SS-31 COA mean every order receives that batch?
No. Each published record applies only to the named batch and SKU. Confirm the batch allocated to the order separately. An older published batch is not evidence of the batch that will be shipped next.
What identifiers should match when checking an SS-31 COA?
Match product name, SKU, and batch number, then compare certificate number, sample identity, test date, and listed laboratory with the original report. For the published examples, those identifiers are 2S5 / 7DBZPVKSWKZU / QC-2026-V7YLMCKM9J, 2S10 / KLGWX0YTTRY0 / QC-2026-MA529RB3YK, and 2S50 / J0Z433P1PZ5F / QC-2026-AXEB4N7NY6.
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.
