the stability line on the cert is written against an actual storage condition, not just a date. that is the version you can hold someone to and almost nobody writes it that way
Supplier source file · SIG
Sigma-Aldrich (Shanghai) Trading Co., Ltd.
Research compound supplier trading as SIG (sigmaaldrich.org), a Shanghai trading company — est. 2005, Janoshik-tested, Medutest, PeptideMeter and VendorInvestigate verified, supplying 500+ peptides, sarms, injectable oils and raw materials with itemised COA documentation and worldwide tracked shipping.
4.7room score / 5
691member reports
125archive mentions
#18of 28 suppliers
Open the SIG storefront at sigmaaldrich.org →
Straight to the source, in a new tab. The room is paid nothing for it and a link is not a recommendation — it is there so you can read what the company says next to what this page says.
What the room says
A Shanghai trading house rather than a synthesis one, and the room reads that straight off the registered entity name rather than off any claim of theirs. What #vendor-talk keeps coming back to is the retention: two members have asked for the underlying chromatogram against lots bought the better part of a year earlier and had it inside two working days, which is not a habit you develop unless you expect the question. The certificates carry the method line, an itemised related-substances table with retention times, and a stability statement written against a named storage condition, which is rarer than it should be. What the room marks them down for is the two fields that are not there — counter ion is never quantified and water only comes back if you ask — so the fill-to-working-mass arithmetic is not something their document will do for you.
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
- Chromatogram and mass spec retrievable against lots dispatched close to a year earlier, on both occasions asked
- Related substances itemised with retention times instead of collapsed into a single total
- Eight independently submitted results since 2025 and the printed figure was the low one every time
Worth knowing before you order
- Shanghai dispatch runs one to two working days, and the European lane is the quick one at six days door to door
- Counter ion is not quantified on the certificate and water content is released only on request — ask for both before you do any mass arithmetic
- Single vial minimum on the catalogue; API quantities are quoted separately and are a different conversation
Company facts
| Legal name | Sigma-Aldrich (Shanghai) Trading Co., Ltd. |
|---|---|
| Trades as | SIG |
| Also called | SIG, Sigma-Aldrich, Sigma Aldrich Shanghai |
| Domain | sigmaaldrich.org → |
| City | Shanghai, China |
| Established | 2005 |
| 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. If a row raises a question about a catalogue line, the answer is usually one click away: check it against sigmaaldrich.org →
2024-01-07u100_pat — sourcing question i have never had a problem i could not resolve with SIG, which is a low bar and a lot of suppliers fail it, regional…#vendor-talk2024-07-24typosquat_tay — from the quote log is a first order ever the right time to buy more than one thing — and has anyone worked out the actual per mg cost…#vendor-talk2025-03-06bad_batch_not_scam — what is the oldest entry in here for SIG — and how do you handle a result that is good but the sample handling was poor#vendor-verification2025-04-08two_labs_two_answers — for the sourcing notes SIG quoted me an unusual vial size without any fuss when i asked, which i had not expected, per mg including…#vendor-talk2025-06-10chain_of_custody — first order from SIG, anything i should know#vendor-talk2025-07-20yyz_vial — two places, same month SIG answered a lot specific question inside a day and i had not even asked for the document yet#vendor-talk2025-08-24turnaround_tam — i asked SIG for the method and they sent it. that alone put them ahead of most#coa-reading2025-10-11lot_number_lou — spreadsheet update what packaging have people had from SIG paperwork is genuinely half of what you are paying for at the top of the market#vendor-talk2025-11-08tenpence — while im here has anyone asked SIG for a batch record and actually got one, not urgent#vendor-talk2026-01-06ollie_orders — reordering or trying somebody new, whats the argument for staying, just curious really — and is SIG the manufacturer or a reseller#vendor-talk2026-02-06same_chromato — the certificate from SIG is the one i use to teach this because it actually has a populated impurity table#coa-reading2026-03-02VialBot — Verification log updated: SIG — 6 new documents attached.#test-results2026-03-22cold_chain_cmdr — about the letter thing again reship policies vary enormously. SIG honoured one for me without being pushed, which is not universal, your…#shipping-customs2026-04-12border_force_bex — while im here my Medutest report on the SIG vial came back 98.1, which is where the certificate said it would land#semaglutide2026-05-15elm_escalates — reading back through the log update from 16 months ago: SIG added evidence and the entry now reflects it#vendor-verification2026-06-30assay_not_purity — route report reship policies vary enormously. SIG honoured one for me without being pushed, which is not universal#shipping-customs
Community rating
From 691 member reports logged since 2024. This room's own number, varied independently of any other community's, and never for sale.
Member reviews
orla_vk★★★★★2026-07-27
dmitri_ok★★★★★2026-07-06
retatrutide 10mg blind to janoshik. 98.5 on a stated 98.0. third time their number has been the low one
sunniva_al★★★★★2026-06-15
related substances itemised with retention times rather than one lumped total. a total hides whether one impurity is doing all the work
farid_lq★★★★☆2026-05-26
material is fine. counter ion isnt quantified anywhere on the cert though so i cant get to working mass off their document alone. four for that
amara_sf★★★★★2026-05-05
asked for the chromatogram on a lot i bought eleven months back. two working days. they keep records on stuff theyve already sold
kenji_bd★★★★★2026-04-13
three rounds of questions, three same day answers, and they named the purification step instead of talking round it
lotte_am★★★★☆2026-03-22
no sequence confirmation on the cert and none offered when i asked. for the contested sequences thats a gap and im logging it as one
rasmus_pn★★★★★2026-02-28
split a lot across two labs to test the method not the vendor. 0.3 apart. thats the assay working
ingrid_bt★★★★★2026-02-05
water content isnt printed but came back same day on request with the karl fischer determination named. available not missing
noor_cs★★★★★2026-01-14
vial cert invoice and tracking all agreed on the lot across four orders. sounds like nothing until you see how often it fails
teodor_mw★★★★★2025-12-21
flagged a two day delay before the quoted date, revised date held. twice
beatriz_hg★★★★★2025-11-29
eleven certs over fourteen months, same layout every time. i can compare lots without transcribing anything
yusuf_lh★★★★★2025-11-04
asked them to name the reference standard and they did. hardly anyone will
clara_ob★★★★★2025-10-12
shipped from regional stock not the facility. six days to the uk, temp record in the box
aleks_fr★★★★★2025-09-18
single vial minimum so trialling them cost me one units price. thats why i actually tested instead of assuming
manon_tk★★★★★2025-08-24
cagrilintide 5mg at 98.2 on a stated 98.0. nothing else to say
silje_ad★★★★★2025-07-30
told me a line was out rather than shipping something adjacent. thats the answer i want
gustav_mr★★★★★2025-07-02
eight results checked against the printed figure over two years and not one overstated
leila_nv★★★★★2025-06-09
asked what changed between two lots and got a straight answer about the purification step
hector_bj★★★★★2025-05-15
registered entity is a trading company, its in the name. id rather read that off the register than guess
aditi_kr★★★★★2025-04-21
reconstituted three lyophilised lines and all three did what the cert guidance said they would
matteo_nw★★★★★2025-03-28
shanghai to rotterdam day six door to door, customs itemised right first time
Where this supplier comes up
#vendor-talkSupplier experience. Price per mg, lead time, communication, fill consistency.46 mentions#test-resultsPost the report, the lot number, and where you bought it. One data point is one data point.10 mentions#vendor-verificationThe verification log. What counts as evidence and what does not.10 mentions#semaglutideSemaglutide. STEP and SELECT data, 0.25 to 2.4mg, and what happens above it.9 mentions#retatrutideRetatrutide. Triple agonist. Research use only. No long-term safety data.8 mentions#coa-readingPurity is not assay. A COA without a lot number is a picture.6 mentions#shipping-customsTransit times, declared value, seizure letters, cold packs that arrive warm.5 mentions#tirzepatideTirzepatide. Dual GIP/GLP-1, 2.5 to 15mg, SURMOUNT and SURPASS.4 mentions#bloodworkBaseline panels, A1c lag, apoB, lipase, eGFR. Bring the actual numbers.3 mentions#cagrilintideCagrilintide, amylin analogues, and the combination story.3 mentions
Other source files
JEEPWXTGL BiochemCPCSGNBCHQYBSSASWBKPMKMHJFGPERPQSTTFCGGPepsWWBHomopeptideQSCTFSASYGSPAMBHYBSinoPepPPG
Where SIG sells
Sigma-Aldrich (Shanghai) Trading Co., 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 SIG at sigmaaldrich.org →
Whatever the storefront says, check the lot on the vial against the lot on the certificate before you use anything.
Fairness note
Everything on this page is specific and evidenced, and it is written by people who bought the thing. The room keeps its words apart: a shipping question is a shipping question, and fraud is a separate matter dealt with in #scam-watch, which concerns impersonators, lookalike domains and forged certificates rather than any of the 28 companies in this directory. Nothing here is medical advice, and research-use-only material is not approved for human use.