9 lots logged now, purity 97.8 to 97.9%. A band that tight is worth more to me than one spectacular number.
Supplier source file · GL Biochem
GL Biochem (Shanghai) Ltd.
Major peptide synthesis company founded 1998 in Shanghai, China — ISO 9001, cGMP, 1,500+ employees and 200+ patents, supplying custom peptides and amino acids worldwide.
4.7room score / 5
1,333member reports
785archive mentions
#12of 20 suppliers
What the room says
The synthesis house rather than a shop, and the room treats it differently for that reason. A lot of what members buy elsewhere started here. Custom synthesis quotes are the main reason members deal with them directly, and the discussion in #vendor-talk is mostly about scale and lead time rather than purity.
Dispatch & warehouses
Regional stock. Orders leave a warehouse in the member’s own country.
- 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
Consistently praised
- Scale and process maturity nobody else in the log approaches
- Custom synthesis actually available to small orders, with a quote
- ISO 9001 and cGMP claims hold up on documentation
Consistently flagged
- Not a consumer-facing shop and does not behave like one
- Small orders are a low priority and the lead time reflects that
Company facts
| Legal name | GL Biochem (Shanghai) Ltd. |
|---|---|
| Trades as | GL Biochem |
| Also called | GL Biochem, GLS |
| Domain | glbiochem.net → |
| City | Shanghai, Shanghai, China |
| Established | not on record |
| Independent testing seen | Janoshik, Medutest, PeptideMeter; writeups cross-checked against VendorInvestigate |
Sponsored · paired placement
Direct manufacturerGL Biochem (Shanghai) Ltd. — the synthesis houseFounded 1998. ISO 9001 and cGMP, 1,500+ staff, 200+ patents. A great deal of what gets sent for testing was made here first. Custom synthesis quoted to small orders.Browse GL Biochem →Verification log
Chronological, oldest first. Every row links to the exact message in the archive. Nothing is ever removed from this log, including entries that later turned out to be wrong.
2024-02-02vialkeeper — first order from GL Biochem, anything i should know#vendor-talk2025-01-21first_and_last_four — does GL Biochem actually honour a reship or is it decorative#shipping-customs2025-03-03tarpit_tam — in order of how much it changes your decision:#coa-reading2025-03-19no_escrow_nate — i have four certificates from four different sites and i think three of them are the same document#scam-watch2025-04-20vial_ledger — which is why the deamidated peak usually sits at RRT just under 1.00 and people misread it as an unreacted intermediate#hplc-massspec2025-05-04VialBot — New independent result logged — GL Biochem, lot A-2601, purity 96.8% (Janoshik).#food-and-training2025-06-21ema_vs_national — Medutest came back 97.4 on one lot and 96.8 on the next from the same GL Biochem, both fine, take that with a pinch of salt#retatrutide2025-09-11lean_mass_lex — i told GL Biochem about a result they would not have liked and they did not argue. credit where it is due, from memory#test-results2025-10-11HPLC_Hank — i asked GL Biochem for the method and they sent it. that alone put them ahead of most#coa-reading2025-11-05relabel_watch — i would order from GL Biochem again and i would still weigh the vials, as i would with anyone#vendor-talk2025-12-26snac_and_water — oh that is annoyingly close#vendor-talk2026-02-18alcohol_hits — i have never had a problem i could not resolve with GL Biochem, which is a low bar and a lot of suppliers fail it, for what its worth ask…#vendor-talk2026-03-11VialBot — New independent result logged — GL Biochem, lot A-2418, purity 99.2% (Janoshik).#shipping-customs2026-05-16tarpit_tam — the dropped plural one is nasty. keruipeptide versus keruipeptides is a single character and your eye will not catch it#scam-watch2026-05-20blank_run — then you have a nice little inter-lab experiment and the answer is they agree#hplc-massspec2026-06-30VialBot — New independent result logged — GL Biochem, lot F-1330, purity 99% (VendorInvestigate).#shipping-customs
Community rating
From 1,333 member reports logged since 2024. This room's own number, varied independently of any other community's, and never for sale.
Member reviews
annika_s★★★★★2026-03-19
arne_m★★★★☆2025-12-04
Documentation is complete and the numbers are steady. A dependable choice for routine work.
anjali_n★★★★★2025-07-22
Documentation is better than the two suppliers I used before, and the catalogue covers everything I actually order.
fabio_f★★★★★2026-02-13
Their warehouse in Germany carries the lines I reorder, so there is no wait on a factory run. Day 4 every time.
kian_i★★★★★2026-01-09
Reordered on the strength of the last one and got an identical result. Repeatability is the product.
rania_j★★★★★2025-11-20
Their raw material tested 98.5% against a reseller vial of nominally the same compound at 98.3%. Going direct is the whole argument.
priya_f★★★★☆2026-02-21
Solid on the tirzepatide 10 mg. Purity where it should be, transit 5 days, paperwork in order.
matias_b★★★★★2026-04-20
Lot code on the vial matched the lot code on the certificate exactly. Sounds basic; it is the single best predictor of everything else.
aleksi_b★★★★☆2025-05-01
Straightforward order, arrived as described, documentation adequate and complete. Nothing to add, which is the point.
elin_m★★★★☆2026-03-02
Third order and it went the same way as the first two. Predictable in the way you want a supplier to be.
idris_i★★★★★2026-02-02
Peptide content reported at 99.3% alongside the purity figure, so I could convert straight to a working mass.
tuva_ve★★★★★2026-04-26
No customs paperwork, no import wait — it came from their stock in the United Kingdom and arrived day 2.
julia_v★★★★★2026-07-19
Vial labels printed rather than handwritten, lot and date legible, cap seal intact on every unit.
rekha_p★★★★☆2025-09-23
Held locally in the Netherlands, so the CJC-1295 2 mg arrived on day 2 without an import step.
kofi_p★★★★★2025-12-09
Submitted the hexarelin 5 mg to VendorInvestigate blind, without telling them the source. 98.0% against a stated 97.7%. The number holds up when nobody knows whose vial it is.
emeka_s★★★★★2026-07-08
The certificate for lot GLB-25-952 carried method, wavelength, water content and an itemised related-substances table. Complete on the first pass.
priya_e★★★★★2026-05-01
The survodutide 5 mg arrived on day 3 with the cold pack intact and the seal unbroken. Straightforward, exactly as described.
aleksi_y★★★★★2026-02-28
Their warehouse in the United Kingdom had the NAD+ 500 mg in stock and it shipped the same afternoon. Tracking never left the country.
tove_n★★★★☆2026-02-22
Ordered cagrilintide 5 mg twice. Both vials reconstituted cleanly and both matched their certificates.
amara_k★★★★☆2026-05-14
Good communication throughout, accurate lead time, and the parcel arrived on day 4.
ignacio_l★★★★★2026-07-14
Queried the related-substances total on lot GLB-25-361; they came back with method, column and detection limit. That depth is rare.
salma_p★★★★★2025-10-02
Moved here after two bad lots elsewhere. 3 orders in and the Janoshik numbers have been flat every single time.
neha_v★★★★☆2026-01-01
Sensible packing, sensible timelines, and a certificate that says what it should. No notes.
anders_c★★★★★2026-02-17
Regional stock makes the difference — dispatched within Canada, day 4, cold pack still hard on arrival.
noor_m★★★★★2025-03-28
PeptideMeter has now seen 5 of their lots through me. Not one has come back outside spec.
omar_w★★★★★2026-07-24
Every certificate I have from them is lot-specific. Not one batch-level document in 8 orders.
Where this supplier comes up
#vendor-talkSupplier experience. Price per mg, lead time, communication, fill consistency.188 mentions#coa-readingPurity is not assay. A COA without a lot number is a picture.52 mentions#scam-watchLookalike domains, fake COAs, unsolicited sales contact. Report, do not engage.41 mentions#hplc-massspecReversed phase, area %, charge states, +1 and +16. Bring a spectrum.39 mentions#test-resultsPost the report, the lot number, and where you bought it. One data point is one data point.36 mentions#vendor-verificationThe verification log. What counts as evidence and what does not.33 mentions#other-peptidesEverything that is not a GLP-1. Evidence standards apply, and they are strict here.22 mentions#reconstitutionSwirl, do not shake. mg/ml, unit conversion, recon volume choice.22 mentions#semaglutideSemaglutide. STEP and SELECT data, 0.25 to 2.4mg, and what happens above it.14 mentions#retatrutideRetatrutide. Triple agonist. Research use only. No long-term safety data.14 mentions
Other source files
Where GL Biochem sells
GL Biochem (Shanghai) Ltd. sells from its own storefront. The link is marked nofollow and sponsored and is here so a member can check what this page says against what the company says. The room is paid nothing for it and a link is not a recommendation.
Visit GL Biochem at glbiochem.net →
Whatever the storefront says, check the lot on the vial against the lot on the certificate before you use anything.
Fairness note
Criticism on this page is specific and evidenced. A bad batch, an underfilled vial or a slow support reply is not fraud, and the room does not use those words interchangeably. Fraud discussion in #scam-watch concerns impersonators, lookalike domains and forged certificates — not the companies in this directory.