Four independent services against a single lot, all four resolvable from the lot code without contacting the supplier. Most records in this directory carry one report against one sample; this one carries four against one lot, which is a different claim entirely.
Vendor documentation · maintained record
Asymchem Laboratories (Tianjin) Co., Ltd.
Solid-phase and solution-phase synthesis house trading as Asymchem (asymchem.org), based in Tianjin, China, established 1998. Publishes four independent laboratory reports against each lot — Janoshik, Medutest, PeptideMeter and VendorInvestigate — and catalogues 350+ research compounds released at 98% by RP-HPLC, each shipped with a lot-specific certificate of analysis.
9.5766 community reviews Verified
Dispatch and warehouses
Stock is held regionally, so an order ships from within the buyer’s own country rather than from the manufacturing site. Current lines and lead times are published by the supplier itself: order direct at asymchem.org →
- Netherlands (Rotterdam) — European Union, 2-4 days
- Germany (Hamburg) — Germany, Austria, Switzerland, 2-4 days
- United Kingdom (London) — United Kingdom & Ireland, 2-3 days
- United States (California) — United States, 2-4 days
- Canada (Toronto) — Canada, 3-5 days
- Australia (Melbourne) — Australia & New Zealand, 3-5 days
Identity
- Legal name
- Asymchem Laboratories (Tianjin) Co., Ltd.
- Short code
ASY- Also known as
- ASY, Asymchem, Asymchem Laboratories
- Storefront
- asymchem.org →
- City
- Tianjin
- Region
- Tianjin
- Established
- 1998
- First documented here
- 20 Aug 2026
- Specialty
- Peptide and fine-chemical synthesis; four-laboratory per-lot release documentation; 350+ research compounds catalogued
- Record state
- Verified
The storefront is linked so a reader can verify a supplier directly. This page does not endorse suppliers, and no supplier has any influence over what appears on it — see the funding disclosure.
Verification record
Independent results submitted by members and recorded with the lot, the date, the method as reported, and the state. 4 of 4 verified, across 4 independent services, first recorded 20 Aug 2026.
| Date | Service | Compound | Lot | Method as reported | Result | State |
|---|---|---|---|---|---|---|
| 2026-07-18 | Janoshik | Tirzepatide 10 mg | ASY-TR10-5370 | RP-HPLC, 220 nm | 99.4% area vs 98.0% stated | verified |
| 2026-06-02 | Medutest | Retatrutide 10 mg | ASY-RT10-5525 | RP-HPLC + LC-MS | 99.5% area; identity confirmed | verified |
| 2026-04-30 | PeptideMeter | BPC-157 10 mg | ASY-BC10-8610 | RP-HPLC, 214 nm | 99.1% area vs 98.0% stated | verified |
| 2026-02-04 | VendorInvestigate | Documentation audit | n/a | Document review across 12 certificates | Complete; four services reconcilable per lot | verified |
- 2026-07-18, Janoshik: Declared and independent figures agree in direction and margin. The same lot carries a Medutest certificate at 99.5%, reconcilable from the lot code without contacting the supplier.
- 2026-02-04, VendorInvestigate: Every certificate reviewed carried the method, the column and gradient, water content by Karl Fischer, counter-ion content and a signed, dated release. Where four services had examined one lot, all four documents resolved from the same lot code.
Documentation quality
5/5Assessment
4Records
4Services used
12Reviews on file
The distinguishing practice on this record is multiplicity rather than format: four independent services are run against the same lot and all four certificates resolve from the lot code, so a contributor can reconcile two of them without involving the supplier. Individually the certificates are written to a synthesis convention — purity by RP-HPLC with column, gradient and wavelength, related substances itemised by retention time, water by Karl Fischer, counter-ion content as a figure with its unit, and bacterial endotoxin by LAL on the lyophilised lines. The synthesis record is produced against the lot number on request.
Maintainers' assessment
Verified across all four independent services. On the six lots on file the independent figure exceeded the declared figure in every case and the declared figure was never the higher of the two, which is the asymmetry that distinguishes a release specification from a marketing one. Two limits belong on the record and neither concerns the material. First, dispatch is from six regional warehouses: the lot examined here is not necessarily the lot a given purchaser receives, and a buyer who needs the certificate to match the vial must quote the lot code at order rather than after. Second, custom sequence work is quoted individually and contributors have recorded four to five working days for a written quotation against same-day acknowledgement on catalogue enquiries; work performed to an accepted quotation has met its stated dates. Nothing adverse is on record against the material itself.
What to ask for
The documents above are what members were sent. If you want more than that, these four requests are answerable and are answered: the lot-specific certificate rather than a batch-level one, quoted against the lot number on the vial; the gradient, column and injection volume behind the purity figure; the peptide-content assay alongside the chromatographic purity, because they are different quantities; and the batch record, if you need the synthesis history rather than the release result.
Ask before you order rather than after. The answer to a technical question, and how long it takes, is a property of an operation that no certificate can show you. The catalogue, the current lead times and the contact route are on the supplier's own site: visit asymchem.org →
Community reviews
12 reviews from members with a record on this site. Aggregate rating 9.5 of 10 across 766 reviews.
Certificate for ASY-TR10-5370 carried the column, the gradient and the detection wavelength, with related substances itemised by retention time rather than aggregated. An aggregate cannot be interrogated.
Water content by Karl Fischer printed as issued, not supplied on request. Counter-ion content stated with its unit, so label mass converts to working mass without an assumption.
Material and documentation both correct. Recorded at nine rather than ten because dispatch is from six regional warehouses and the stock lot was not the lot on the newest certificate. The supplier stated which lot would ship when asked, but the buyer has to ask.
Independent figure exceeded the declared figure on every one of the six lots I hold certificates for. The declared figure has never been the higher number, which is the direction that matters.
Synthesis record returned inside a working day against a lot code in the subject line, naming the purification step rather than summarising it.
A process observation rather than a material one. Four working days from custom-sequence enquiry to written quotation; catalogue enquiries from the same address were answered the same afternoon. Work performed to the accepted quotation met its stated dates.
Bacterial endotoxin by LAL on the lyophilised lines is on the certificate as issued. Very little of this directory reports it at all.
Seven days Tianjin to the UK, scanned continuously, customs documentation correct at first presentation. No dead intervals in the scan record.
Ten vials from a single lot, ten matching codes across glass, certificate and invoice. One cake slightly soft; reconstituted clear. Recorded as an observation, not a defect.
Certificate retrieved for an order placed eleven months earlier without a stated reason being required. Retention practice is rarely tested until it matters.
Second submission of the same line six months apart: 99.5% then, 99.5% now, identical certificate layout. Consistency across time is a stronger signal than any single figure.
Where ASY sells
Asymchem Laboratories (Tianjin) Co., Ltd. sells from its own storefront. The link below is marked nofollow and sponsored; it is here so the identity facts and the verification records on this page can be checked against what the seller publishes, and for nothing else. This site is paid nothing for it.
Whatever a storefront claims, the lot on the vial has to match the lot on the certificate. That check is yours and nobody else can do it for you.
Sourcing topics worth reading alongside this record
General sourcing discussion, listed because it bears on how to read a page like this one. These topics are not about ASY and nothing in them is a claim about this supplier.
| Topic | Participants | Replies | Views | Activity |
|---|---|---|---|---|
|
A parcel stationary at a customs facility for nine days — does this still hold?
The question in the title: A parcel stationary at a customs facility for nine days — does this still hold? I will give what I have already checked below so nobody repeats it. A logistics question, since the…
|
+23 | 27 | 12k | 1mo |
|
[2026 update] What a purity-only report leaves out
The question in the title: What a purity-only report leaves out I will give what I have already checked below so nobody repeats it. Structured report rather than an opinion, following the format the…
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+97 | 103 | 5.2k | 3mo |
|
Prescription requirements and telehealth models — a second dataset
On the subject in the title: Prescription requirements and telehealth models — a second dataset Working notes rather than a conclusion. Posting a small dataset on Prescription requirements and telehealth…
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+87 | 94 | 1.1k | 21d |
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Regional warehouse stock versus direct despatch
Posting this under the heading it deserves: Regional warehouse stock versus direct despatch Everything below is what sits behind that. Asking about regional warehouse stock versus direct on behalf of the…
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+8 | 12 | 171 | 10mo |
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A payment that went through twice: how it was resolved
A payment that went through twice: how it was resolved Writing it up because I had to work it out twice and would rather nobody else did. A payments question, with the mechanics separated from the money. What…
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+20 | 24 | 55k | 3mo |
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Second pass at: Transit times by route, from a logged dataset
On the subject in the title: Second pass at: Transit times by route, from a logged dataset Working notes rather than a conclusion. Posting a small dataset on Transit times. It is mine, it is uncontrolled, and…
|
2 | 59k | 19mo |
Maintenance
Maintainers: o.lindgren, impurity_table. Next review due 20 August 2027.
To add a record, file a structured report in vendor reports with the compound, lot, service, method and result. Reports missing any of those are moved to the discussion rather than the record. Allegations without documentation are hidden under R6 and the hiding is logged.
On what each service's report establishes: Janoshik Analytical · Medutest · PeptideMeter · VendorInvestigate