Vendor dossier · Tianjin
Tianjin Finder Chemical Co., Ltd.
A Tianjin exporter with four-service verification, honest certificates and a habit of quoting purity to one decimal it cannot support.
Journal grade · ranked 12 of 20
737 reader reports
on the record
TFC is a competent exporter with verification from all four independent services and a documentation set that is above the median for this directory. Its own certificates report purity to one decimal place — 99.2%, 98.7% — from a single determination on an instrument whose stated method does not support that precision. The numbers are not wrong. They are more confident than the measurement permits.
Storefront The company sells directly at tfcpeptides.com. Visit TFC → — a labelled, nofollowed link the Journal is paid nothing for. Read the record before you use it.
The record
Ten independent purity determinations, mean 97.3%, range 95.8–98.9%. Vendor-stated figures averaged 1.4 percentage points higher than ours, consistently in the same direction, which is the signature of an integration convention rather than of dishonesty.
We put that to the company with three side-by-side chromatograms. The reply was the most useful technical exchange in this entire dossier project: TFC confirmed it integrates to a 0.05% threshold and excludes peaks eluting before a stated retention time as solvent-related. That convention is defensible, it is disclosed on request, and it explains almost the whole 1.4-point gap. It should be printed on the certificate.
Fulfilment is good — ten of ten delivered, median transit ten days, correct customs classification every time. The company answers questions in a way that suggests the person answering has seen a chromatogram.
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
- Ten independent purity determinations, mean 97.3% (range 95.8–98.9%).
- Verification records with all four independent services, confirmed directly.
- A written, specific account of the vendor's integration convention: 0.05% threshold, early-eluting peaks excluded as solvent-related.
- Ten of ten orders delivered, median transit ten days, correct tariff classification on all ten.
What we could not verify
- Why the integration convention is not printed on the certificate, given the company will state it on request.
- Whether purity is determined per lot or per campaign.
- Sterility and endotoxin. Not offered.
- The reference standard used, which is not identified.
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 |
|---|---|---|---|---|---|
| 2026-03 | Janoshik | Retatrutide 2 mg | 96.7% | 96.7% | not tested |
| 2025-11 | Medutest | Semaglutide 10 mg | 98.0% | 97.1% | 82% |
| 2025-11 | PeptideMeter | Tesamorelin 15 mg | 97.5% | 96.3% | not tested |
| 2025-09 | Medutest | Tirzepatide 15 mg | 97.2% | 97.0% | 96% |
| 2025-05 | Medutest | Semaglutide 20 mg | 98.9% | 98.6% | not tested |
| 2025-03 | Janoshik | Tesamorelin 5 mg | 98.6% | 97.6% | 88% |
| 2025-02 | PeptideMeter | Tirzepatide 10 mg | 98.0% | 97.1% | 90% |
| 2024-12 | Medutest | Semaglutide 15 mg | 99.3% | 97.9% | not tested |
| 2024-12 | Medutest | Semaglutide 20 mg | 99.6% | 98.3% | not tested |
| 2024-10 | Medutest | Tirzepatide 5 mg | 97.0% | 96.8% | not tested |
| 2024-10 | Medutest | Cagrilintide 2 mg | 99.4% | 97.9% | 81% |
| 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 the outcome, without editorialising. 2 of 7 logged requests received a full answer within the period.
| Date | Request | Outcome |
|---|---|---|
| 2026-05 | Requested comment on an independent purity determination below the stated figure | Answered in part; the specific question was not addressed |
| 2025-11 | Asked whether corrected certificates are reissued to earlier purchasers | Offered a video call in place of a written answer; declined |
| 2025-09 | Asked whether release testing is performed per lot or per campaign | Answered in part; the specific question was not addressed |
| 2025-04 | Asked which catalogue items are synthesised in-house | Answered in full within 10 working days |
| 2025-03 | Asked whether sterility or endotoxin testing is performed | Declined as commercially confidential |
| 2024-10 | Asked whether pre-change stock remained in distribution | Answered in full within 10 working days |
| 2024-06 | Requested the reference-standard lot number | Acknowledged; no substantive reply |
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.
Reordered on the strength of the last one and got an identical result. Repeatability is the product.
Ordered IGF-1 LR3 1 mg twice. Both vials reconstituted cleanly and both matched their certificates.
Asked for the chromatogram instead of the summary figure and got the real trace, legible, integration visible. They send it without hesitating.
Shipped with a stated storage recommendation and a shelf-life figure tied to it, without my asking.
Shipped from their warehouse in the United Kingdom, arrived day 5, documentation complete.
Lot code on the vial matched the lot code on the certificate exactly. Sounds basic; it is the single best predictor of everything else.
Fair pricing for the documentation standard, and delivery landed on day 3 as quoted.
No customs paperwork, no import wait — it came from their stock in the Netherlands and arrived day 2.
Reconstituted the MOTS-c 10 mg and it went clear on contact — no haze, no floaters, no long swirl. Tells you the lyophilisation was done properly.
Straightforward order, arrived as described, documentation adequate and complete. Nothing to add, which is the point.
Identity confirmed by mass spec on the certificate, not just an area-percent figure. Both questions answered on one page.
Support answered on a Sunday, correctly, with the batch record attached. That is well beyond what I expected.
Stock said available, stock was available, and it shipped the same day. That sequence is not as common as it should be.
4 orders in eighteen months, no substitutions, no reformulations, everything in stock when the site said it was. Boring is the highest compliment I have.
Moved here after two bad lots elsewhere. 5 orders in and the VendorInvestigate numbers have been flat every single time.
They report purity by RP-HPLC with the wavelength stated and peptide content separately. Two different numbers, correctly separated.
Submitted the TB-500 5 mg to VendorInvestigate blind, without telling them the source. 99.0% against a stated 98.6%. The number holds up when nobody knows whose vial it is.
Every certificate I have from them is lot-specific. Not one batch-level document in 9 orders.
Queried the related-substances total on lot TFC-25-503; they came back with method, column and detection limit. That depth is rare.
Cold pack was still hard on arrival in Dublin on day 2. My logger never went above 6°C across the whole run.
Everything about the order was routine in the best sense — quoted 3 days, arrived in 3.
Solid on the IGF-1 LR3 1 mg. Purity where it should be, transit 3 days, paperwork in order.
Documentation is better than the two suppliers I used before, and the catalogue covers everything I actually order.
Domestic dispatch from their stock in Australia. Straightforward, day 3, exactly as quoted.
Steady supplier. PeptideMeter results have agreed with their stated figures on every lot I have submitted.
Ninth order from them, all GHRP-2 5 mg. Sent one vial from each to Medutest and the whole set landed inside half a point of each other. That flatness is exactly what I pay for.
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 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 tfcpeptides.com. Visit TFC → — a labelled, nofollowed link the Journal is paid nothing for. Read the record before you use it.
Tianjin Finder Chemical 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.