SIG
Sigma-Aldrich (Shanghai) Trading Co., Ltd.
Shanghai · China · est. 2005 · source page added 20 May 2025
Buy direct from SIG at sigmaaldrich.org →
Their storefront, not ours. Marked nofollow and sponsored, and nobody here is paid for it.
Shanghai trading arm of a life-science supply operation, established 2005, and the paperwork is the reason it is on this table rather than the price. Certificates arrive with the method line, an itemised related-substances table and a stability statement tied to a named storage condition — all three as standard rather than on request. Across eight independent tests logged here on four different services the claimed figure has been the conservative one every single time, which is the only pattern this board treats as meaningful. Shanghai lanes are the quick ones into Europe; ask which of your lines is held regionally before you assume the quoted transit.
- Legal name
- Sigma-Aldrich (Shanghai) Trading Co., Ltd.
- Short code
- SIG
- Also known as
- SIG, Sigma-Aldrich, Sigma Aldrich Shanghai
- Shop domain
- sigmaaldrich.org →
- City
- Shanghai
- Established
- 2005
- Community rating
- 95%
- Independent tests logged
- 6
Regional stock, so orders ship inside the buyer’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
- Eight logged independent tests across four services and the claim has never come back the higher number
- Certificates carry method line, itemised related substances and a named-condition stability statement as standard
- Technical questions come back with column, gradient and wavelength rather than reassurance
- Shanghai origin, so the European lanes are the quick ones — ask which of your lines is held regionally rather than dispatched from the facility
- The certificate carries batch, date of analysis, method line, related substances and a stability statement; water content comes back on request for any lot
- Minimum on the research catalogue is a single vial and API quantities are quoted separately — ask for the batch record for the lot they would actually ship you
| Date | Service | Compound | Batch | Claimed | Result |
|---|---|---|---|---|---|
| 2026-07-24 | Janoshik | Retatrutide 10mg | SIG-2607 | 98.0% | 98.5% |
| 2026-06-11 | Medutest | Semaglutide 5mg | SIG-2606 | 98.5% | 98.7% |
| 2026-04-02 | PeptideMeter | Tirzepatide 10mg | SIG-2604 | 98.0% | 98.4% |
| 2026-02-17 | VendorInvestigate | BPC-157 5mg | SIG-2602 | 97.5% | 98.1% |
| 2025-12-05 | Janoshik | Cagrilintide 5mg | SIG-2512 | 98.0% | 98.2% |
| 2025-09-19 | Medutest | Ipamorelin 5mg | SIG-2509 | 97.5% | 97.9% |
| From | To | Carrier | Days |
|---|---|---|---|
| Shanghai | UK | DHL | 6–9 |
| Shanghai | EU | DHL | 6–9 |
- 1[Lab] split one vial across PeptideMeter and VendorInvestigate — 99.0% and 99.1%c/vendorvetting · 16k points · 64 comments
- 2[Vendor] WXT vs JEEP on the same compound, same month — both cleared 97.0%c/coa · 15k points · 38 comments
- 3[Vendor] GL Biochem vs GGPeps on the same compound, same month — both cleared 97.5%c/coa · 14k points · 51 comments
- 4purity is the most under-discussed thing on this boardc/coa · 13k points · 66 comments
- 5why does nobody talk about water contentc/coa · 13k points · 63 comments
- 6[Meta] the area percent rule is doing its job and people should stop complainingc/coa · 11k points · 58 comments
- 7unpopular opinion: most of what gets said here about PeptideMeter is guessworkc/vendorvetting · 11k points · 27 comments
- 8[Lab] FGP BPC — PeptideMeter came back 99.6% against a claimed 99.0%c/coa · 11k points · 28 comments
- 9vendor is the most under-discussed thing on this boardc/vendorvetting · 11k points · 65 comments
- 10how much of what we believe about batch actually comes from purity threadsc/coa · 10k points · 52 comments
ordered retatrutide 10 mg and put it through janoshik myself. 98.5% against a stated 98.0%. their number was the conservative one.
asked for the batch record before paying. had it the same afternoon, full document, method line and the impurity table on one page.
certificate lists peptide content separately from chromatographic purity. that is the detail that tells you who actually runs the assay.
day 7 to the UK out of shanghai. customs paperwork correct first time, which is the whole reason it was fast.
asked a counter-ion question expecting to be ignored. got acetate vs TFA answered properly with the method behind it.
split one order across two lots to compare. 98.4 and 98.3. that is instrument noise, not a difference between lots.
third order. nothing substituted, nothing quietly swapped after payment. boring, which is the point.
reconstituted the ipamorelin and it went clear immediately. no haze, nothing suspended. you can see it straight away.
lot SIG-25-1187 came back 98.2%. the vial, the certificate and the invoice all named the same lot.
they flagged a two day delay before it happened rather than after. almost nobody does that.
weighed five vials against the label out of curiosity. all inside 2%. fill consistency gets ignored and it should not.
sent one vial to medutest and one to peptidemeter because I did not trust the first result. 0.2 apart. fine.
shanghai lane to australia landed day 9, domestic on the last leg. no chasing anyone.
the lead time quoted at checkout was the one I got, to the day.
catalogue is genuinely deep rather than deep-looking. asked about three obscure lines and got prices and lead times for all three.
reordered at ten months to check for drift. 98.1 then, 98.2 now. nothing has moved.
their raw tested higher than a reseller vial of the same compound. going direct is a number, not a vibe.
certificate carries a stability statement against a named storage condition. I would hand it to someone as the example.
first order deliberately small. vendorinvestigate said 98.1 on a claimed 97.5. second order was not small.
asked about storage before ordering and they moved dispatch to a monday so it would not sit in a depot over the weekend.
purity by RP-HPLC with the wavelength stated. the number means something when they tell you how they got it.
water content on an older lot came back the same day with the analysis attached. no argument about it.
packaging was cold, sealed and nothing had shifted in transit. vials labelled with the lot matching the cert.
six orders over eight months. zero drama. highest compliment I have for a supplier.
Sigma-Aldrich (Shanghai) Trading Co., Ltd. sells from its own storefront. Read what they say about themselves against the log above, then decide.
Go to the SIG store — sigmaaldrich.org →
Check the lot on the vial against the lot on the certificate when it arrives. A good record predicts your batch; it cannot guarantee it, and no storefront can.