Vendor dossier · Tianjin
Asymchem Laboratories (Tianjin) Co., Ltd.
A Tianjin synthesis house incorporated in 1998 that releases its research catalogue against four independent laboratory reports per lot rather than one report per sample.
Journal grade · ranked 24 of 28
705 reader reports
on the record
ASY is the oldest incorporation in this directory and the only entry that publishes four independent analyses against a single lot. The Tianjin entity and the 1998 registration are on the register; solid-phase and solution-phase synthesis run on its own lines, and the 350-odd catalogue lines are released at 98% by RP-HPLC against certificates from Janoshik, Medutest, PeptideMeter and VendorInvestigate, each resolvable from the lot code printed on the vial. The practical consequence is that a buyer can audit the claim without involving the seller, which is a materially different position from a supplier who publishes one certificate and asks to be believed.
Storefront The company sells directly at asymchem.org. Visit ASY → — a labelled, nofollowed link the Journal is paid nothing for. Read the record before you use it.
The record
The documentation is written to a synthesis convention. Purity is reported by RP-HPLC with the column, the gradient and the detection wavelength stated; related substances are itemised with retention times rather than aggregated into a single total; water content is determined by Karl Fischer and printed as issued; counter-ion content is given as a figure with its unit, so label mass converts to working mass without an assumption. On the lyophilised lines the certificate also carries bacterial endotoxin by LAL, which most of this directory does not report at all.
Twelve determinations are on file across five molecules, spread over four services. The declared figure has not once been the higher of the two, and the spread between services examining the same lot has stayed inside a few tenths of a point — which is where two competently run instances of the same method should differ. Where the same line has been ordered twice months apart, the second certificate has matched the first in both figure and layout.
Two operational limits belong on the record and neither concerns the material. Dispatch is from six regional warehouses, so the lot in a given box is not necessarily the lot on the most recently published certificate: a buyer who needs the two to match must quote the lot code at order rather than after. And custom sequence work is quoted individually, running four to five working days behind a catalogue enquiry that is typically answered the same day; work performed against an accepted quotation has met its stated dates.
Dispatch and warehouses
Regional stock in six countries; orders are dispatched domestically rather than from the manufacturing site.
- 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
What we verified
- Tianjin incorporation and the 1998 founding year against the register
- Four independent laboratory certificates resolving from a single lot code without contacting the seller
- Method line, itemised related substances, Karl Fischer water and counter-ion content present on the certificate as issued
- Bacterial endotoxin by LAL reported on the lyophilised lines as issued rather than on request
Ordering: lead times, minimums and what to ask for
- Six regional warehouses; stock rotation is not published, so lot-to-certificate matching has to be requested at order
- Custom synthesis quoted individually — four to five working days, against same-day acknowledgement on catalogue enquiries
- Cold-chain packing standard on lyophilised material; confirm explicitly for a summer shipment to a hot destination
- Tianjin dispatch: six to nine days to the UK and eight to thirteen to the EU on the transit records held here
Documented testing record
Every independent determination the Journal has commissioned or been able to corroborate on material sold under this name. Purity figures are chromatographic and are not comparable between laboratories unless the method matches; where a content determination was performed it is reported separately, because purity and content answer different questions.
| Date | Laboratory | Item | Stated | Independent | Content |
|---|---|---|---|---|---|
| 2026-05 | VendorInvestigate | IGF-1 LR3 5 mg | 99.6% | 99.9% | not tested |
| 2026-02 | PeptideMeter | Tirzepatide 20 mg | 98.5% | 99.0% | not tested |
| 2025-12 | VendorInvestigate | Retatrutide 5 mg | 98.5% | 99.2% | 96% |
| 2025-09 | Medutest | Semaglutide 15 mg | 98.5% | 98.7% | 96% |
| 2025-07 | Medutest | Retatrutide 5 mg | 99.2% | 99.6% | 100% |
| 2025-04 | PeptideMeter | BPC-157 5 mg | 99.1% | 99.3% | not tested |
| 2025-02 | Medutest | IGF-1 LR3 5 mg | 99.4% | 99.9% | 100% |
| 2024-11 | PeptideMeter | IGF-1 LR3 20 mg | 98.2% | 98.9% | 100% |
| 2024-10 | Janoshik | Retatrutide 15 mg | 98.1% | 98.9% | not tested |
| 2024-06 | VendorInvestigate | Retatrutide 20 mg | 98.7% | 99.1% | 100% |
| 2024-05 | Medutest | BPC-157 10 mg | 98.2% | 98.6% | not tested |
| 2024-02 | Janoshik | BPC-157 5 mg | 99.1% | 99.3% | not tested |
| Stated = the figure on the certificate accompanying the vial. Independent = the figure returned by the named laboratory on a sample submitted by the Journal or corroborated with the submitting party. Content = peptide content as a percentage of labelled nominal mass, where determined. | |||||
Correspondence log
The Journal writes to every company in this programme each quarter. The log records the question, the date and what came back, without editorialising. All 9 requests logged in the period were answered in full, and the outcome column records what the answer contained rather than the fact that one arrived.
| Date | Request | Outcome |
|---|---|---|
| 2026-04 | Requested the specification against which a lot is released | Answered in full within 4 working days; specification sent, with the tighter internal limit noted |
| 2025-12 | Asked whether a certificate can be reissued to an earlier purchaser on request | Answered in full; certificates are retained and reissued against the lot number |
| 2025-10 | Asked which catalogue items are synthesised in-house | Answered in full within 2 working days; the in-house list was itemised |
| 2025-06 | Requested confirmation of the registered entity name and incorporation number | Answered in full; registration certificate sent as a scan, entity name matching the invoice |
| 2025-04 | Requested the reference-standard lot number behind a purity figure | Answered in full; the reference-standard lot was quoted and matched the supplier of the standard |
| 2024-12 | Requested the analytical method behind the stated purity figure | Answered in full; the method sheet was attached and names the column chemistry |
| 2024-10 | Asked for the name and location of the synthesis facility | Answered in full; the manufacturing site was named and the fill site named separately |
| 2024-05 | Requested a batch record for a specific lot | Answered in full; the batch record was sent against the certificate reference |
| 2024-02 | Asked how long finished stock is held before dispatch | Answered in full within 3 working days; holding period given per line, with the storage condition |
On the record
Reader reports printed with the writer’s consent. The Journal verifies that a purchase took place before printing a report of one; we do not print anonymous claims about a named company, and we do not print a report we cannot date.
The synthesis route is published rather than described. I can see which coupling was used and where the purification cut was taken, which is not something I can say about anything else in this directory.
Twenty-seven years of incorporation and the paperwork reads like it: method, gradient, column and wavelength on every document I hold.
Blind submission to PeptideMeter came back above the declared figure. I send without disclosing the source and I report whatever returns.
Asked which resin a line was assembled on and had a direct answer, not a referral to a sales desk.
Related substances itemised with retention times. A single total would not have told me whether it was one impurity or ten.
Tianjin dispatch, nine days to Norway, continuously scanned.
A chromatogram was produced on request for a lot released sixteen months earlier.
Twelve vials weighed against declared fill, all within two per cent.
Content reported separately from purity, with the method named.
Repeat purchase of one line at thirteen months agreed with the original to a tenth of a point on the same declared method.
No finding against the material. Custom quotations have taken up to a week where catalogue enquiries are answered the same day.
The published route is the reason I started here and the documentation is the reason I stayed.
Independent determinations by two services on one lot agreed to within two tenths and both agreed with the certificate.
Water by Karl Fischer on the certificate as issued.
Customs documentation correct at first presentation on all three consignments.
Five lots logged across a year inside a one-point band.
Release signed and dated by a named individual rather than initialled.
Not affiliated with the supplier. Reporting because a published route deserves saying out loud.
How to read this dossier
A single grade is a poor instrument and we publish one anyway, because readers will construct one if we do not. It is a composite of four things: the analytical record on material we bought at retail, the quality of the documentation supplied with it, responsiveness to written questions, and fulfilment reliability. It is not a safety assessment, it is not an endorsement, and it says nothing about the specific vial in front of you.
The finding that recurs across all twenty-one dossiers is that within-company variation between batches is frequently wider than between-company variation. That is an argument for testing the lot rather than for choosing the supplier, and it is the reason this programme reports individual determinations rather than only averages.
Storefront Everything above was written from material bought at retail from asymchem.org. Visit ASY → — a labelled, nofollowed link the Journal is paid nothing for. Read the record before you use it.
Asymchem Laboratories (Tianjin) Co., Ltd. sells material described as being for research use only. Such compounds are not approved for human use in any jurisdiction. The Journal buys material for analytical purposes, does not resell it, accepts no vendor funding for this programme, and has no commercial relationship with any company in this directory.