[REVIEW] QSC — consistency and pricing, 10+ orders deep — Vendor Reviews

Senior Member

2,123

8,901

Jan 2024

Pennsylvania

Jun 8, 2026 at 1:14 PM#1

Figured it's time to do a proper write-up since I've been ordering from QSC (Qingdao Sigma Chemical) consistently since last July. Five orders total, mix of tirzepatide and semaglutide. Here's the full breakdown: Order 1 (July 2025): 4x tirz 30mg vials — shipped from China. Took 18 days door-to-door to East Coast US. Paid via BTC. Total $108 shipped. Order 2 (Sept 2025): 6x tirz 30mg + 2x sema 5mg — China direct again. 21 days this time. $174. Order 3 (Nov 2025): Switched to US warehouse. 5x tirz 30mg — arrived in 4 business days. Slightly higher price at $38/vial vs $27 from China. Order 4 (Jan 2026): 8x tirz 30mg from US warehouse — 3 days to arrive. $296. Used Zelle this time. Order 5 (Feb 2026): 4x tirz + 4x sema from US warehouse — 5 days. $248. All vials arrived intact, vacuum sealed, cold pack on the US warehouse orders. Never had a customs issue with China direct but the wait was rough. US warehouse is a game-changer honestly. Purity-wise I sent Order 3 to Janoshik and got 98.2% for tirz. Very happy with that. Overall rating: 8.5/10 — only dings are the China shipping times and the fact that their website goes down periodically. Product quality has been rock solid. 💉

31 1matt_MKE, Dr.ReproEndo, lucas_SP_BR and 28 others

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LibrarianMeg

Senior Member

1,678

7,890

Mar 2024

Baltimore, MD

Jun 8, 2026 at 2:21 PM#2

Great write-up. Your experience mirrors mine pretty closely. I've done 3 orders all from US warehouse and never waited more than 5 days. The pricing from China is tempting but I just can't deal with 3-week waits. One question — did you notice any difference in the powder appearance between your China-direct vials and the US warehouse ones? My last US warehouse batch had a slightly more "fluffy" lyophilized cake compared to earlier orders.

30 0PharmD_Rodriguez, julia.endo, JessicaM_2024 and 27 others

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ZaraB_AL

Member

456

1,678

Jan 2025

Alabama

Jun 8, 2026 at 3:28 PM#3

Good question. Yes actually — the China direct vials had a more compact puck at the bottom, almost like a dense tablet. The US warehouse ones were fluffier/more fragile looking, crumbled easier during reconstitution. Both dissolved perfectly clear though. I think it might just be batch variation in the lyo process. Purity tested the same so I wouldn't read too much into it.

29 24TirzTom, TrialTracker_MD, JennaRN and 26 others

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Janoshik Analytical — Independent Testing

Trusted third-party HPLC & mass spectrometry analysis. Verify peptide purity with the lab the community relies on. Independent. Accurate. Transparent.

Verify Your Peptides

GL Biochem (Shanghai) Ltd. — Direct Manufacturer

Est. 1998. The synthesis house behind the vials you send for testing. ISO 9001 and cGMP certified, 1,500+ staff, batch-specific COA with every order.

Browse GL Biochem

SleepDoc_PDX

Member

289

1,234

Sep 2024

Portland, OR

Jun 8, 2026 at 4:34 PM#4

Appreciate the detail here. I'm about to pull the trigger on my first QSC order. Few questions: 1. How's their communication? I've heard mixed things about response times. 2. Did you ever have a vial that looked "off" — discolored solution after reconstitution, floaters, etc.? 3. The Zelle option — did they send you a direct contact or is it through an intermediary? Thanks 🙏

28 23sophie_paris, mel_PDX, Dr.AddMedPHL and 25 others

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ZaraB_AL

Member

456

1,678

Jan 2025

Alabama

Jun 8, 2026 at 11:08 PM#5

1. Communication is... functional. Tracy (their main CS rep) responds within 24 hours usually but sometimes it's clearly copy-paste answers. If you have a real issue you need to be persistent. I'd rate comms 6/10. 2. Never had a discolored vial. All reconstituted crystal clear. One vial from Order 2 had lost vacuum (cap depressed when I pushed the needle in without resistance) but the powder looked fine and I used it anyway with no issues. 3. Zelle goes to what appears to be a personal account name. Won't share details publicly but it's straightforward. They also take BTC, ETH, and cashapp now I believe.

Last edited: Jun 9, 2026 at 12:08 AM

27 22JennaRN, LabKate, kate.chem and 24 others

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