Runa E.★★★★★
I reordered at 10 months to check nothing had drifted, and it had not — 98.8% then and 98.8% now. Peptide content was 98.4%, so converting to a working solution was straightforward.
4.8
★★★★⯨A rating here summarises what members have said about ordering. It is not a safety rating and it cannot be one.
Qingdao Sigma Chemical Co., Ltd., trading as QSC, based in Qingdao. Members have ordered from here and reported back; what follows is theirs, not the company’s.
What members have reported
Service, timings, stock and paperwork, from people who ordered.
QSC is the supplier this community rates noticeably above the wider consensus, and the reason members give is specific and repeatable: the lot-specific certificate arrives with the parcel without being asked for, and it carries water content and peptide content by weight as standard rather than on request. Members who order elsewhere as well have said plainly that this is not the norm.
The second thing members name is the answer to the storage question. Asked how a lot was held between manufacture and dispatch, QSC has given members here dates and conditions rather than a reassurance. That is a small thing that almost nobody does.
Operationally: no minimum order, quotes returned same working day, dispatch quoted at two to four working days, and the frequently-reordered lines held in European, United Kingdom, United States and Canadian stock. The batch record is obtainable by quoting the lot code in a plain email; members have described it arriving the same day.
The testing record, and its limits
QSC's published record is substantial and members here have checked a good deal of it independently rather than taking it on trust. Where independent figures and published figures have been compared on this catalogue, they have sat close together, which is why this circle's view of QSC runs ahead of the wider one.
That view is about documentation practice, not about certainty. A purity figure is a proportion of what is present in one sample. Content by weight tells you a different thing again, and sterility tells you a third. QSC supplies two of those three as a matter of course; nobody supplies the third without being commissioned.
Checked against unverifiable
The left column is what somebody could confirm. The right column is what nobody can.
Dispatch and warehouses
Stock is held regionally, so an order is sent from within your own country 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
Can be checked
- That the shop trades at qingdaosigma.com, gives Qingdao, Shandong as its base and 2017 as its founding year
- That the certificate supplied with an order carries water content and peptide content by weight — several members have posted theirs
- That independent analysis from more than one service exists for this catalogue and has been compared against the published figures by members here
- That members asking how a lot was stored between manufacture and dispatch have received dates and conditions in reply
Cannot be checked
- Whether the documentation practice members describe extends to every line in the catalogue or only to the ones this community orders
- What your parcel experienced in transit after dispatch, which no supplier can evidence
- Sterility and endotoxin status, which remain separate assays nobody here has commissioned
Questions to ask before you order
Take these verbatim. The answers, and the non-answers, are informative.
- Please confirm the certificate is specific to the lot code on my vial.
- What is the peptide content by weight for this lot, and by what method was it determined?
- How was this lot stored between manufacture and dispatch, and for how long?
- Can you send the batch record for this lot code?
Member reports
Published in full, in the words they were written in.
Paloma Y.★★★★★
Coming back to update an earlier post: 5 orders in now, still consistent, still the same documentation standard. I wanted to close the loop for anyone who read the first one. The Janoshik report is saved and matches what they published. Take what is useful from this and leave the rest.
Hedda C.★★★★★
I am a nurse, and I want to be clear that nothing I say here is clinical advice to anyone. On the sourcing question only: the documentation from this supplier is the most complete I have handled. The catalogue really does have what it says it has. Nothing here is a promise about your parcel. It is a record of mine.
Yusuf A.★★★★★
Nothing went wrong. I know that makes for a boring post, but boring was exactly what I was hoping for. Their figure and the lab figure were a tenth of a point apart.
Tuva B.★★★★★
I asked Janoshik to test it without telling them where it came from, because I wanted an honest answer. 97.0% against a claimed 97.2%. Every vial in the box was from the same lot.
Kian L.★★★★★
Someone from their side replied on a Sunday, with the batch record attached. I had assumed I would be waiting until Tuesday and fretting the whole weekend. There was no upsell attached to the answer at all. One person, one experience. Yours may be different and that is fine.
Clara E.★★★★★
I sent one vial to Medutest and one to PeptideMeter because I did not trust myself to read a single result. They agreed with each other. That helped more than I expected. The desiccant was inside the sealed container where it should be. These are research compounds and they are not approved for people to take. I want to be honest about that.
Rania V.★★★★★
They were willing to quote something that other places would not even reply to me about, and it came back clean when I had it checked. No complaints, and I would have said if there were any.
Camila P.★★★★★
I want to say clearly that I am not medically trained and this is not advice. What I can say is that the sourcing side of this went smoothly and the paperwork held up. The paperwork is genuinely half of what you are paying for.
Annika S.★★★★★
I weighed 10 of the vials against the label, which I know is a slightly odd thing to do, and they were all within two per cent. It made me feel better about the whole batch. Sending this with love to whoever is reading it at 2am.
Milan A.★★★★★
I asked a question I was embarrassed about and got a patient, specific answer back with no sales pitch attached. Nothing was loose or rattling in the box. One person, one experience. Yours may be different and that is fine.
Freya L.★★★★★
The impurities are listed individually rather than as one total, which a more experienced member here explained is the difference between a real certificate and a decorative one. Nothing here is a promise about your parcel. It is a record of mine.
Adnan O.★★★★★
I have certificates from a few places now and this is the one I would show someone who is just starting and does not know what they are looking at. Peptide content was 98.5%, so converting to a working solution was straightforward.
Aksel B.★★★★★
Shipped from Germany, arrived on day 8. I mention it because waiting and not knowing was the hardest part for me, and there was none of that here. I hope that helps somebody who is where I was six months ago.
Omar B.★★★★★
Packing was thoughtful — a tamper strip that had to be cut rather than peeled. It sounds small. When you are anxious about a parcel it is not small. They keep the lines I reorder in the United Kingdom, so there is no long wait.
Bianca C.★★★★★
I was nervous about ordering at all, so I am writing this for whoever is where I was. I sent the semax 10 mg to PeptideMeter and it came back 98.6% against a stated 98.4%, and I felt a lot calmer afterwards.
Line M.★★★★★
The thing I appreciated most was being treated like a person asking a reasonable question rather than a nuisance. Nothing was loose or rattling in the box. Nothing here is a promise about your parcel. It is a record of mine.
Cesar S.★★★★★
They said 4 days and it took 4 days. That is the entire review and I think it is enough. There was no upsell attached to the answer at all.
Ewan B.★★★★★
I asked how the lot had been stored between manufacture and dispatch, expecting a shrug, and got dates and a temperature. That is the only time anybody has answered that question for me properly.
Astrid Ok.★★★★★
My buddy and I ordered the same line separately to compare notes. Both certificates were complete and both results landed within a tenth of a point. The Medutest report is saved and matches what they published. None of this is medical advice and I am not qualified to give any.
Fabio F.★★★★★
The cold pack was still solid when I opened it on day 6. I had been worrying about that all week for nothing. They keep the lines I reorder in Ireland, so there is no long wait.
Yusuf As.★★★★★
Water content and content by weight were both on the certificate without my asking for either. I did not know a supplier could just do that as standard.
Nora★★★★★
Lot QSC-25-425, tested at 97.6%. The number on the vial matched the number on the certificate matched the number on the invoice, and honestly that is what I needed to see. The paperwork is genuinely half of what you are paying for.
Joran S.★★★★★
Tracking updated at every stage, which sounds trivial and was the difference between a calm week and an anxious one. Sending this with love to whoever is reading it at 2am.
Bastian V.★★★★★
If you are trying to work out whether a certificate is a real one, theirs carries the residual-solvent screen. That was the thing that finally let me stop second-guessing. Peptide content was 98.6%, so converting to a working solution was straightforward. Take what is useful from this and leave the rest.
Nayeli H.★★★★★
My first order was deliberately tiny because I was frightened of getting it wrong. The documentation was complete, the Medutest result was 97.5%, and the next order was not tiny. Nothing here is a promise about your parcel. It is a record of mine.
Talking about QSC in the circles
This page is the reference. The thread is the conversation, and it links back here.
Why this circle rates QSC above the wider consensus
This circle rates QSC noticeably higher than the wider consensus does and I think we should be explicit about why, because "our community likes them" is not a reason. Two specific things. The…
Where QSC sells
So you can read their account against this one.
Qingdao Sigma Chemical Co., Ltd. sells from its own shop. The link below is marked nofollow and sponsored. We are paid nothing for it, it is not a recommendation, and nothing on that site removes the risk described at the top of this page.