QSC
Qingdao Sigma Chemical Co., Ltd.
Qingdao, Shandong · China · source page added 13 Nov 2023
Buy direct from QSC at qingdaosigma.com →
Their storefront, not ours. Marked nofollow and sponsored, and nobody here is paid for it.
Qingdao warehouse network with worldwide distribution, and one of the few names here that publishes its third-party results rather than filing them. Orders test as well as anything on this page, the warehouse model genuinely shortens delivery in several countries, and the name collides with two unrelated companies — check the entity, not the word.
- Legal name
- Qingdao Sigma Chemical Co., Ltd.
- Short code
- QSC
- Also known as
- QSC, Sigma Chemical, QSC Peptides
- Shop domain
- qingdaosigma.com →
- City
- Qingdao, Shandong
- Established
- not published
- Community rating
- 95%
- Independent tests logged
- 5
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
- Warehouse network shortens delivery to days rather than weeks in several countries
- Publishes Janoshik results rather than keeping them internal
- The material tests as well as anything on this page, and every lot ships with its own documentation
- Confirm you are dealing with this entity: the name is shared with two unrelated companies and the domain on this page is the one members use
- Ask which warehouse your order will ship from — support and lead time both differ by location and they will tell you
- Ask for the batch-specific certificate rather than the catalogue one; it carries the analysis date and method
| Date | Service | Compound | Batch | Claimed | Result |
|---|---|---|---|---|---|
| 2026-02-18 | Janoshik | Semaglutide 10mg | QSC-2602 | 98.0% | 98.1% |
| 2025-09-30 | PeptideMeter | Tirzepatide 10mg | QSC-2509 | 98.0% | 98.3% |
| 2025-04-22 | Janoshik | Semaglutide 5mg | QSC-2504 | 98.0% | 98.2% |
| 2024-11-05 | Medutest | Semaglutide 10mg | QSC-2411 | 98.0% | 98.2% |
| 2024-06-11 | Janoshik | BPC-157 10mg | QSC-2406 | 98.0% | 98.4% |
| From | To | Carrier | Days |
|---|---|---|---|
| EU warehouse | Spain | domestic | 2–4 |
| Qingdao | UK | DHL | 9–12 |
- 1[Lab] QSC cagri — Janoshik came back 98.6% against a claimed 98.5%c/hplc · 14k points · 36 comments
- 2vendor is the most under-discussed thing on this boardc/vendorvetting · 11k points · 65 comments
- 3[Vendor] QSC vs Homopeptide on the same compound, same month — both cleared 98.5%c/retatrutide · 6.2k points · 26 comments
- 4reship — 11 things I got wrong before I got it rightc/vendorvetting · 5.3k points · 56 comments
- 5[Question] area percent — what am I missing herec/coa · 3.5k points · 57 comments
- 6help me understand order records, I have read the wiki twicec/vendorvetting · 3.4k points · 19 comments
- 7order records — 5 things I got wrong before I got it rightc/vendorvetting · 3.3k points · 14 comments
- 8[Lab] 9th independent test on QSC — 98.2% on a claimed 98.0%, and the trend is the interesting partc/scamalerts · 3.1k points · 54 comments
- 9[Discussion] the lane advice in here is 2 years out of datec/intlshipping · 2.1k points · 55 comments
- 10[Discussion] can we stop arguing about PeptideMeter until somebody posts a numberc/vendorvetting · 1.8k points · 45 comments
- 11[Vendor] Homopeptide vs QSC on the same compound, same month — both cleared 98.0%c/labresults · 1.6k points · 51 comments
- 12[Discussion] vendor is doing more work than we give it credit forc/vendorvetting · 1.5k points · 36 comments
10th order, zero drama. that is genuinely all I have to say. paperwork is half of what you are paying for.
the analysis date on the certificate was three weeks before dispatch. peptide content 98.8%, so converting to a working mass was arithmetic rather than guesswork. solid. that is it.
shipped out of the United Kingdom, landed day 3. no customs, no waiting, no chasing. stated purity and independent purity landed a tenth apart.
custom synth quote came back realistic and then they beat the date by 4 days.
ordered IGF-1 LR3 1 mg, sent it to Medutest, came back 98.2% on a stated 97.8%. good enough for me. peptide content 97.5% so converting to a working mass was trivial.
they told me about a 3 day delay before it happened. before. that is the bar and almost nobody clears it. happy. moving on.
weighed 9 vials against label out of curiosity. all within 2%. fill consistency is underrated. no mannitol surprise, cake intact, not collapsed. defaulting to them until something changes.
they will quote lines nobody else will even respond about, and it came back clean. they flagged the delay in advance instead of after. test your own vial regardless. always.
the lot code on the vial matched the paperwork. sounds like nothing. it predicts everything. catalogue is actually deep, not deep-looking. no notes.
the thing that sold me is peptide content being listed separately from purity. nobody does that and everybody should. invoice and vial and cert all agree on the lot. not sponsored, not affiliated, just kept the receipts.
I asked for the release date on the lot and had it the same day and got an actual answer, not a copy-paste. gradient and column are both printed so you could reproduce it. happy. moving on.
day 9 from Canada warehouse, tracking updated every single hop. no upsell attached to the answer, which I noticed because it is unusual.
cold pack was still solid on arrival day 8. in Germany. in summer. n=1 and I am saying so.
packing was a cold pack that was still solid when the box was opened. someone in that warehouse cares.
sent one to PeptideMeter and one to Medutest because I did not believe the first result. both agreed. fine, I believe it. paperwork is half of what you are paying for.
bought tirzepatide 10 mg expecting to have a complaint. do not have one. annoying. defaulting to them until something changes.
9 orders in now and the paperwork has been identical every time. lot QSC-26-623 was fine on test and the trace was clean at the baseline. n=1 and I am saying so.
been buying hexarelin 5 mg from them for 12 months. nothing has changed, which is the point. no upsell attached to the answer, which I noticed because it is unusual.
reconstituted the epithalon 10 mg and it went clear instantly. no haze. you can tell straight away when it has been done properly. customs paperwork right first time which is why it was fast.
6 orders, 9 months, no substitutions and nothing quietly swapped after payment. happy. moving on.
I have certificates from about 6 suppliers and theirs is the one I would hand to someone as an example. would buy again. have bought again.
their raw tested 99.2% against a reseller vial of the same thing at 98.9%. going direct is not a vibe, it is a number. pulled an old cert for a lot from 18 months back without any fuss.
split the order across two lots to compare. came back within 0.1 of each other. peptide content 98.1% so converting to a working mass was trivial.
blind submitted the AOD-9604 5 mg to Janoshik, did not say whose it was. 97.5% vs 97.3% claimed. no upsell attached to the answer, which I noticed because it is unusual.
stock said in stock. it was actually in stock. shipped same day. wild. solid. that is it. solid.
support replied on a sunday with the batch record attached. on a sunday. they flagged the delay in advance instead of after. would buy again. have bought again.
Qingdao Sigma Chemical Co., Ltd. sells from its own storefront. Read what they say about themselves against the log above, then decide.
Go to the QSC store — qingdaosigma.com →
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.