SIG — member reviews
95% from 691 member reports. 24 are published in full below; the rating aggregates all of them. Reviews without an order date or a testable claim are not counted.
This community's number, not a fleet-wide one. Independent groups scoring the same vendor land within a few tenths of each other, and where they diverge it is usually because one group weights logistics and another weights purity consistency.
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.
What a useful review looks like
Order date, what was ordered, what arrived, how long it took, and whether anything was independently tested. That is it. "Great vendor, fast shipping, A+++" is worth nothing and gets removed; a review naming a lot, a document and a turnaround is worth more than ten enthusiastic ones.
Why these twenty and not two hundred
A source page is opened when enough members have ordered and paid for independent testing that the log says something specific. Nearly two hundred other names get a row in the table at the foot of the directory with a band, a report count and a written note — no page, no score, no link. The contrast is the point: the twenty are where the evidence is, not where the enthusiasm is.
Where SIG sells
Sigma-Aldrich (Shanghai) Trading Co., Ltd. sells from its own storefront. The link below is marked nofollow and sponsored and is here so you can read what they say about themselves against what this page says about them. GLP Research Hub is paid nothing for it, and a link is not a recommendation.
Visit SIG at sigmaaldrich.org →
A good record predicts your batch. It does not guarantee it, and no storefront can. Check the lot on the vial against the lot on the certificate.