Synthesis review
Sequence, format and quantity checked against our line before we quote.
Quality & COA policy
One lot, one COA, results you can read.
Every published lot has a COA in the public COA library: HPLC purity against our release specification of NLT 98.0%, plus MS molecular-weight identity. You are welcome to test any lot yourself. A confirmed quality issue is replaced or refunded.
How to check a lot
Match the COA to your order.
Open the COA library (53 public records), find the product and strength, and check the lot number against your quotation. Each record is a PDF you can open directly, with no login.
| Check first | Product, strength, lot number, HPLC purity result and MS identity result. |
|---|---|
| Then check | Manufacturing, test and retest dates, and that the lot matches the one quoted. |
| Do not assume | A COA does not prove fill quantity, sterility, endotoxin level or suitability for any use. |
Example analyses
Historical HPLC and LC-MS examples.
Two earlier Retatrutide analyses, showing HPLC-UV purity, LC-MS identity and measured net content. They show the report format only. They are not current-lot COAs and do not represent every lot.
Lot documents
What comes with a lot.
Before you confirm an order, the quotation names the compound, specification and lot, and links the COA for that lot.
| Certificate of Analysis | Compound, CAS, strength, lot number, manufacturing, test and retest dates. |
|---|---|
| HPLC purity | The measured result for the lot, against the release specification of NLT 98.0%. |
| MS identity | The observed molecular weight, confirming the compound. |
| Lot number | The same lot number on the COA, the label and the order. Reorders can reference the earlier lot. |
| Packaging proof | For private label: vial label, carton, insert and lot-number position approved before production. |
From inquiry to lot file
Four steps. No vague claims.
Current lot check
Where a COA is published, we match it to your compound and lot before invoicing.
Analytical run
HPLC purity and MS identity are tested for each lot and reported on its COA.
Document & ship
Lot documents and packaging proof are compiled, then the shipping route is confirmed.
≤ 4hRFQ reply during business hours
98.7–99.53%HPLC purity across current lots (specification NLT 98.0%)
≤ 3Business days: confirmed released stock, including stock samples, after written payment confirmation
7–15Business days: production after specification and payment; OEM also requires artwork approval
Production & QC
Made, tested and packed in one facility.
Synthesis, purification, lyophilization, HPLC/MS testing and packaging run on our own line in Science City, Guangzhou.
Test it yourself
Two ways to verify before you scale.
Independent testing is welcome. A confirmed quality issue is replaced or refunded under this policy.
Sample kit + your own test
Order 1 kit (10 vials), open the COA for that lot, and send a vial to a laboratory you choose before ordering more.
Bulk order + agreed laboratory
For a bulk RFQ, agree the laboratory, test panel and lot with us before testing starts.
Quality claims
A clear route from a concern to a remedy.
Contact us with your order information or original order conversation when you identify a possible quality issue. We locate the order first and help you collect any missing information. We provide a substantive response within 1 business day and update an open investigation every 2 business days.
| Step | Information and action |
|---|---|
| Identify the lot | Share the product, strength and lot number, with label and packaging photographs where available. Keep remaining sealed same-lot samples and packaging where possible for the review. |
| Review the evidence | Provide any laboratory report, method and sample-source information. We check that results concern the same lot, test parameter and measurement basis. |
| Resolve a difference | Where results differ, we compare analytical methods, sample preparation and measurement uncertainty. If retesting is needed, we agree the laboratory, samples and acceptance criteria in writing. |
| Confirm the remedy | If nonconformity with the agreed specification is confirmed, we arrange replacement or refund and confirm the scope, amount and execution date in writing. |
After replacement approval and confirmation of delivery details and contents, released stock dispatches within 3 business days. Replacements requiring production follow the applicable production window; OEM also requires specification and artwork approval. Approved refunds are initiated within 3 business days after the refund route is confirmed; payment-provider settlement time is additional.
Laboratory and testing-cost arrangements are agreed for the case. Buyer-requested cancellation costs are assessed separately from a confirmed quality remedy. See payment and refund handling. Customs failure and confirmed transport loss follow the free reshipment policy.
Stock samples dispatch within 3 business days after written payment confirmation. Samples requiring preparation use the 3–7-business-day window after specification and payment confirmation. Sample eligibility alone does not confirm stock; the written quotation identifies the applicable fulfillment status.
FAQ
Questions before you order.
Where do I find the COA for a lot?
In the COA library. Filter by product and strength, then open the PDF. Each COA shows the HPLC purity result and MS identity for that lot.
What if my product or strength is not in the library?
Send an RFQ. We tell you which lot you would receive and send its COA with the quotation. We do not present older or generic COAs as current-lot documents.
What purity do you guarantee?
Our release specification is NLT 98.0% by HPLC. The actual result for each lot is on its COA. HPLC purity does not prove fill quantity, sterility, endotoxin level or suitability for any use.
Can I test the material independently?
Yes. Many buyers start with a 1-kit sample, read the lot COA, test a vial at a laboratory they choose, then scale. A confirmed quality issue is replaced or refunded.
How do I report a quality concern?
Contact us with order information or the original order conversation and the batch information available. We help complete missing information, respond substantively within 1 business day and update an open investigation every 2 business days. We review same-lot results on the same measurement basis and agree any retesting. Confirmed nonconformity with the agreed specification is replaced or refunded, with the remedy and execution date confirmed in writing.
When is a quality remedy carried out?
After replacement approval and confirmation of delivery details and contents, released stock dispatches within 3 business days; a replacement requiring production follows the applicable production window. Once a refund is approved and the refund route is confirmed, we initiate it within 3 business days. Payment-provider settlement time is additional.
What does a lot number look like?
For example SQ261012-RT10, the Retatrutide 10 mg lot in the COA library. The same number is used on the COA, the label and the order.