Runa E.★★★★★
Custom synthesis quote came back with a realistic timeline and they beat it. Purity on delivery matched the signed spec.
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
Including the reports that do not flatter anybody.
Members describe ordering as straightforward. Transit sits in the one-to-three week band most of the time, and the cold pack usually arrives cold. The reports that matter most are the ones where something went wrong, and those are below with the rest.
Communication is described as quick and a little formulaic. Members who asked a precise question generally got a precise answer; members who asked an open one got a template.
The testing record, and its limits
QSC publishes third-party reports against catalogue items, and several members have commissioned their own testing rather than relying on those. Independent results have broadly matched the published figures.
What a purity figure proves is narrow. It tells you what proportion of the peptide present is the peptide you wanted. It says nothing about how much peptide is in the vial, and nothing about sterility. Those are separate measurements and they are not always supplied.
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 and gives Qingdao as its base
- That third-party reports exist for named catalogue items, and that members have independently reproduced some of them
- That members here have ordered, received, and reported back over a period of months
Cannot be checked
- Any relationship, or absence of one, between this shop and any similarly named company
- Chain of custody between manufacture and dispatch, including how long stock sat and at what temperature
- Sterility and endotoxin status of anything in a vial, which no purity panel addresses
Questions to ask before you order
Take these verbatim. The answers, and the non-answers, are informative.
- Can you send the certificate for the lot number printed on my vial, not a representative one?
- Does the certificate include peptide content by weight as well as purity?
- How was this stored between manufacture and dispatch, and for how long?
Member reports
Published in full, including the unimpressed ones.
Paloma Y.★★★★★
Peptide content reported at 98.8% alongside the purity figure, so I could convert straight to a working mass.
Hedda C.★★★★★
Queried the related-substances total on lot QSC-24-999; they came back with method, column and detection limit. That depth is rare.
Yusuf A.★★★★☆
Domestic dispatch from their stock in the United Kingdom. Straightforward, day 4, exactly as quoted.
Tuva B.★★★★★
Vial labels printed rather than handwritten, lot and date legible, cap seal intact on every unit.
Kian L.★★★★☆
Sensible packing, sensible timelines, and a certificate that says what it should. No notes.
Clara E.★★★★★
6 orders in eighteen months, no substitutions, no reformulations, everything in stock when the site said it was. Boring is the highest compliment I have.
Rania V.★★★★☆
Ordered BPC-157 10 mg twice. Both vials reconstituted cleanly and both matched their certificates.
Camila P.★★★★★
Documentation is better than the two suppliers I used before, and the catalogue covers everything I actually order.
Annika S.★★★★★
Their warehouse in the United Kingdom had the semaglutide 5 mg in stock and it shipped the same afternoon. Tracking never left the country.
Milan A.★★★★☆
Shipped from their warehouse in the United States, arrived day 4, documentation complete.
Freya L.★★★★★
Reconstituted the hexarelin 5 mg and it went clear on contact — no haze, no floaters, no long swirl. Tells you the lyophilisation was done properly.
Adnan O.★★★★★
Submitted the selank 10 mg to PeptideMeter blind, without telling them the source. 98.0% against a stated 97.6%. The number holds up when nobody knows whose vial it is.
Aksel B.★★★★★
Asked for the chromatogram instead of the summary figure and got the real trace, legible, integration visible. They send it without hesitating.
Omar B.★★★★★
Every certificate I have from them is lot-specific. Not one batch-level document in 4 orders.
Bianca C.★★★★★
Stock said available, stock was available, and it shipped the same day. That sequence is not as common as it should be.
Line M.★★★★★
Ordered on a Monday from their warehouse in Germany and it was here by day 4. That is the whole case for regional stock.
Cesar S.★★★★★
Their warehouse in the United States carries the lines I reorder, so there is no wait on a factory run. Day 4 every time.
Ewan B.★★★★☆
Consistent rather than flashy. Everything lands in the high nineties, and it lands there every time.
Astrid Ok.★★★★★
Costed them per mg against three other suppliers on the same mazdutide 5 mg spec. Competitive on price and clearly ahead on documentation.
Fabio F.★★★★★
Asked them to hold an order until I confirmed a lot number and they did, without fuss and without a restocking charge.
Yusuf As.★★★★★
Their raw material tested 98.9% against a reseller vial of nominally the same compound at 98.9%. Going direct is the whole argument.
Nora★★★★★
First order, deliberately small, tirzepatide 10 mg only. Documentation, transit and a Janoshik result at 98.6% all checked out, so the next one will not be small.
Joran S.★★★★★
Third order from them, all retatrutide 5 mg. Sent one vial from each to PeptideMeter and the whole set landed inside half a point of each other. That flatness is exactly what I pay for.
Bastian V.★★★★★
Dispatched from their warehouse in Germany rather than from the factory, so the selank 10 mg was with me on day 5.
Nayeli H.★★★★★
Asked a genuinely technical question about pre-dispatch storage and got a reply with numbers in it, inside 4 hours.
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.