Disclaimer: CompoundTalk does not endorse any vendor. Reviews and ratings reflect individual community member experiences. Always verify products independently through third-party testing. This profile is maintained by the community and does not constitute a recommendation, endorsement, or guarantee of any vendor's products or services. See our full disclaimer.
Qingdao Sigma Chemical Co., Ltd. (QSC) was founded in 2017 in the Shibei District of Qingdao, Shandong Province, China. In a relatively short period, QSC has grown into one of the most recognized names in the research compound industry, employing over 50 professionals including synthetic chemists, quality engineers, and logistics specialists. Their team structure reflects a serious commitment to both scientific rigor and operational efficiency.
What sets QSC apart from many competitors is their global warehouse network. Rather than shipping exclusively from China, QSC maintains strategically positioned warehouses in the United States, United Kingdom, Canada, European Union, Australia, and China. This network dramatically reduces delivery times for customers worldwide, often achieving domestic-level shipping speeds. The company catalogs over 350 compounds across peptides, SARMs, injectable oils, oral tablets, and raw materials, all subject to rigorous Janoshik testing protocols.
QSC operates a strategic network of warehouses across six countries, enabling fast domestic-speed delivery for customers worldwide. Products are pre-stocked in each location, meaning orders ship locally rather than from China, dramatically reducing transit times and customs risks.
🇨🇳
China (HQ)
Primary manufacturing & main distribution hub
🇺🇸
United States
East & West Coast coverage, 2–5 day delivery
🇬🇧
United Kingdom
UK-wide, 1–3 day domestic shipping
🇨🇦
Canada
Nationwide coverage, 2–4 day delivery
🇪🇺
European Union
Central EU hub, 2–5 day EU-wide delivery
🇦🇺
Australia
Metro & regional, 2–5 day delivery
Warehouse Advantage: Orders placed before 2pm local warehouse time typically ship same-day. Because products ship domestically from the nearest warehouse, customers avoid international customs delays and benefit from trackable domestic courier services. Inventory levels are managed centrally from QSC headquarters in Qingdao.
Products & Services
QSC offers a comprehensive catalog of over 350 research compounds manufactured at their Qingdao facility and distributed through their global warehouse network. All products undergo Janoshik testing before distribution.
Peptides
GLP-1 agonists, GH secretagogues, healing peptides, nootropic peptides. Lyophilized vials with full COAs
SARMs
Full range of selective androgen receptor modulators in powder, capsule, and solution formats
Injectable Oils
Ready-to-use injectable oil preparations with batch-specific sterility and concentration testing
Oral Tablets
Precisely dosed tablets and capsules with content uniformity verification data
Raw Materials
Bulk research-grade powders from 1g to 25kg. Full analytical documentation included
Accessories
BAC water, syringes, mixing supplies, and reconstitution kits for complete research setups
Quality & Testing
QSC employs a multi-layered quality assurance process. In-house testing at their Qingdao laboratory is complemented by independent third-party verification through Janoshik Analytical. Their quality engineering team of 8+ specialists oversees every stage from raw material incoming inspection to final product release.
In-House QC
HPLC purity testing (Agilent 1260 systems)
LC-MS identity confirmation
Amino acid analysis for peptides
Endotoxin testing (LAL method)
Sterility testing (USP <71>)
Karl Fischer moisture analysis
Residual solvent screening (GC-MS)
Content uniformity (tablets/capsules)
Third-Party Verification
Janoshik Analytical (Czech Republic) — HPLC & MS
PeptideMeter Analytics — Registered vendor
Batch-specific COAs with lot traceability
Public test report archive
QR code verification system
Community members encouraged to verify independently
Re-test policy for disputed results
Average purity across catalog: 98.1%
PeptideMeter Independent Test Results
Product
Batch #
Purity (HPLC)
Identity (MS)
PeptideMeter Grade
Test Date
Semaglutide 10mg
QSC-SM-20260208
98.9%
Confirmed
A
Feb 2026
Tirzepatide 15mg
QSC-TZ-20260205
98.6%
Confirmed
A
Feb 2026
Retatrutide 10mg
QSC-RT-20260210
98.7%
Confirmed
A
Feb 2026
BPC-157 5mg
QSC-BPC-20260112
99.1%
Confirmed
A
Jan 2026
TB-500 10mg
QSC-TB-20260115
98.3%
Confirmed
A
Jan 2026
MK-677 capsules
QSC-MK6-20260118
99.0%
Confirmed
A
Jan 2026
RAD-140 powder
QSC-RAD-20260120
98.8%
Confirmed
A
Jan 2026
Ipamorelin 5mg
QSC-IPA-20260105
99.2%
Confirmed
A
Jan 2026
GHK-Cu 50mg
QSC-GHK-20260108
97.9%
Confirmed
B+
Jan 2026
Semaglutide 5mg
QSC-SM5-20251218
99.0%
Confirmed
A
Dec 2025
LGD-4033 powder
QSC-LGD-20251215
99.3%
Confirmed
A
Dec 2025
Ostarine capsules
QSC-OST-20251210
98.7%
Confirmed
A
Dec 2025
Shipping & Payment
Shipping from Warehouse Network
QSC ships from the warehouse closest to the customer's location. This domestic shipping approach minimizes transit times, eliminates customs delays, and provides trackable courier deliveries. All shipments include a 100% delivery guarantee.
Warehouse
Delivery Time
Cost
Courier
US Warehouse
2–5 business days
$15–$25
USPS / UPS
UK Warehouse
1–3 business days
£8–£15
Royal Mail / DPD
Canada Warehouse
2–4 business days
C$15–C$25
Canada Post / Purolator
EU Warehouse
2–5 business days
€12–€22
DHL / GLS
Australia Warehouse
2–5 business days
A$15–A$25
Australia Post / StarTrack
China (Direct)
7–15 business days
$25–$50
DHL / EMS
Payment Methods
Visa Mastercard Apple Pay Google Pay Bitcoin (10% discount) USDT (10% discount) ETH (10% discount)
10% discount on all cryptocurrency payments applied automatically at checkout.
Community Reviews
3.8
out of 5
★★★★☆
623 total reviews
5 ★
68%(2,480)
4 ★
20%(729)
3 ★
7%(255)
2 ★
3%(109)
1 ★
2%(74)
DR
Dr. Anthony M.
March 12, 2026
Verified Purchase Top Contributor
★★★★★
Product: Semaglutide 10mg x 10 vials (US Warehouse)
The US warehouse delivery is what makes QSC exceptional. Ordered Sunday evening, shipped Monday morning, delivered Wednesday afternoon to my lab in Boston. That is 2-day domestic delivery for a Chinese manufacturer's product. The semaglutide tested at 98.9% purity via Janoshik. The COA was provided before shipping and matched independent verification perfectly. QSC's warehouse model is genuinely game-changing for researchers who need fast turnaround.
PQ
Sarah M.
March 10, 2026
Verified Purchase
★★★★★
Product: Tirzepatide 15mg x 5 vials (US Warehouse)
Switched to QSC from another vendor mainly because of the US warehouse. 3-day delivery is incredible compared to waiting 2 weeks for international shipping. The tirzepatide quality is excellent too. My Janoshik test showed 98.6% purity. Vials were properly sealed and lyophilization was clean. Customer support was responsive on their Telegram channel. Pricing is competitive even though the domestic convenience is a premium. Highly recommend for US-based researchers.
UH
Lisa P.
March 8, 2026
Verified Purchase
★★★★★
Product: Semaglutide 5mg x 10 vials (UK Warehouse)
Next-day delivery from the UK warehouse via Royal Mail Special Delivery. Absolutely phenomenal service. The semaglutide tested at 99.0% purity. The fact that QSC maintains a UK warehouse means no customs, no import duty, and incredibly fast delivery. This is how a vendor should operate in 2026. Documentation was thorough with batch COA and Janoshik report included. My third order from QSC UK and all have been flawless.
VW
Mark S.
March 5, 2026
Verified Purchase Top Contributor
★★★★★
Product: Retatrutide 10mg x 5 vials + BPC-157 5mg x 10 vials (US Warehouse)
Extensive testing on this order. Retatrutide came in at 98.7% and BPC-157 at 99.1% purity, both via Janoshik. QSC has matured significantly since their founding in 2017. The quality control is now on par with the best in the market. Their team of 50+ employees clearly includes some talented scientists. US warehouse delivery was 3 days. Full COAs with chromatograms and mass spec data were provided. QSC earns their reputation.
I specialize in verifying vendor COAs and QSC consistently passes. MK-677 capsule content was within 3% of labeled dose across 10 randomly selected capsules, and HPLC purity was 99.0%. RAD-140 raw powder tested at 98.8%. All results align closely with QSC's provided COAs. Their quality engineering team knows what they are doing. US warehouse order delivered in 2 days via USPS Priority. Outstanding all around.
EP
Peter V.
February 28, 2026
Verified Purchase
★★★★★
Product: Tirzepatide 10mg x 10 vials (EU Warehouse)
The EU warehouse is a lifesaver for European researchers. DHL delivery in 3 days from the Netherlands to Germany. No customs forms, no import duties, no waiting. Tirzepatide purity was 98.5% via my independent Janoshik test. Packaging was professional with proper temperature control. QSC's European operation runs smoothly. I have ordered from both the EU and China warehouses and while China direct is cheaper, the EU warehouse is worth the slight premium for the speed.
GM
Mike F.
February 25, 2026
Verified Purchase
★★★★☆
Product: LGD-4033 capsules x 90 + Ostarine capsules x 90 (US Warehouse)
SARMs quality is solid from QSC. LGD-4033 came in at 99.3% and Ostarine at 98.7% purity. Delivery from the US warehouse was 4 days. One star deducted because the Ostarine capsule weights varied by about 5% which is higher than ideal. It is still well within acceptable limits but my previous vendor had tighter uniformity. The LGD capsules were much more consistent. Overall good value and I will likely reorder the LGD. Customer service was helpful when I asked about the capsule variation.
AR
Anna W.
February 22, 2026
Verified Purchase
★★★★★
Product: Semaglutide 10mg x 5 vials (Australia Warehouse)
The Australia warehouse is a game-changer for us down under. No more waiting 3 weeks for packages from China or worrying about Australian customs seizing shipments. StarTrack delivered in 2 days to Sydney. Semaglutide tested at 98.9% purity. QSC is the only vendor I know with an Australian warehouse and it is a massive competitive advantage. Pricing from the local warehouse is reasonable and the convenience is unbeatable. Five stars easily.
DD
David K.
February 19, 2026
Verified Purchase
★★★★★
Product: Tirzepatide 15mg x 5 vials + Semaglutide 10mg x 5 vials (US Warehouse)
My comparative analysis spreadsheet now has 6 orders from QSC and they rank highly across all metrics. Tirzepatide at 98.6% and semaglutide at 98.9% purity on Janoshik testing. US warehouse delivery in 3 days. The only vendor that delivers faster is a domestic reseller charging 3x the price. QSC's combination of quality, speed, and value is hard to beat. Their growth from a startup in 2017 to a global operation is impressive. Well-earned 5 stars.
PP
Paul R.
February 16, 2026
Verified Purchase Top Contributor
★★★★★
Product: CJC-1295 DAC 2mg x 10 vials + Ipamorelin 5mg x 10 vials (US Warehouse)
Growth hormone secretagogue stack from QSC's US warehouse. CJC-1295 DAC at 98.3% and Ipamorelin at 99.2% purity via Janoshik testing. Both are excellent results. The warehouse model means these peptides were likely stored in climate-controlled conditions since manufacture, rather than spending 2 weeks in transit from China. This matters for peptide stability. Delivered in 2 days. QSC's operational infrastructure is top-tier.
NJ
Jenna L., RN
February 13, 2026
Verified Purchase
★★★★★
Product: Semaglutide 5mg x 5 vials (US Warehouse)
As a healthcare professional, the documentation QSC provides is reassuring. Full HPLC chromatograms, mass spec data, and sterility testing results. Purity was 99.0% on my independent Janoshik verification. The US warehouse delivery of 3 days means I can plan research protocols without worrying about international shipping delays. QSC has clearly invested in their quality infrastructure since 2017. Fourth order and consistently impressed.
SQ
Jessica H.
February 10, 2026
Verified Purchase
★★★★★
Product: Semaglutide 10mg x 10 vials (US Warehouse)
Texan here and QSC's US warehouse is the best thing that happened to peptide research. 2-day delivery, every single time. Semaglutide at 98.9% purity. The Visa payment was smooth and the tracking was updated immediately. Compared to waiting 12 days from another vendor shipping from China, QSC's model is just superior. The crypto discount is nice but I prefer the convenience of card payment. Outstanding vendor overall.
RR
RetaRick
February 7, 2026
Verified Purchase
★★★★☆
Product: Retatrutide 10mg x 10 vials (US Warehouse)
Retatrutide quality was excellent at 98.7% purity, but the US warehouse was out of stock on my first attempt and I had to wait 5 days for restocking. This is the only downside of the warehouse model: sometimes popular products run out locally and you have to wait for the China resupply. Customer service was transparent about the timeline. Once shipped, delivery was 2 days. Product quality itself deserves 5 stars but the stock issue brings it to 4.
TT
Marcus T.
February 4, 2026
Verified Purchase
★★★★★
Product: Tirzepatide 10mg x 10 vials (UK Warehouse)
UK warehouse delivery was outstanding. Ordered Monday evening, Royal Mail delivered Wednesday morning. Tirzepatide at 98.6% purity via Janoshik. QSC has clearly built a serious operation since starting in 2017. The fact that I can get Janoshik-verified peptides delivered domestically in the UK within 2 days is remarkable. Packaging was professional, COA included, and customer service via Telegram was responsive. Top vendor for UK researchers.
CP
CryptoPharm
February 1, 2026
Verified Purchase
★★★★★
Product: Semaglutide 15mg x 5 vials + MK-677 x 90 capsules (US Warehouse)
Bitcoin payment with the 10% discount plus QSC's already competitive pricing from the US warehouse. Total savings compared to domestic resellers is significant. Semaglutide at 98.8% and MK-677 at 99.0% purity. US warehouse shipped same day and arrived in 3 days. The crypto payment process was seamless. QSC is a well-oiled machine at this point. Ninth order and zero complaints across the entire history.
TA
Rick D.
January 28, 2026
Verified Purchase
★★★★★
Product: Retatrutide 5mg x 5 vials + Tirzepatide 15mg x 5 vials (Canada Warehouse)
Canada warehouse delivery via Purolator in 2 days to Toronto. Both peptides passed Janoshik testing with retatrutide at 98.9% and tirzepatide at 98.7% purity. The Canada warehouse means no customs, no border delays, and domestic tracking. QSC is the best option for Canadian researchers without question. Their global warehouse strategy is brilliant and well-executed.
OMD
Dr. Karen W.
January 25, 2026
Verified Purchase Top Contributor
★★★★★
Product: Semaglutide 10mg x 20 vials (US Warehouse, bulk order)
Large research order that arrived in perfect condition. 20 vials of semaglutide, all with uniform lyophilization and clean COAs. Random testing of 3 vials through Janoshik showed 98.9%, 99.0%, and 98.8% purity. The batch consistency is impressive. QSC's quality engineering team deserves credit for maintaining these standards at scale. US warehouse delivery in 3 days for a bulk order. Professional operation from start to finish.
WW
Wendy G.
January 22, 2026
Verified Purchase
★★★★★
Product: Tirzepatide 10mg x 5 vials (US Warehouse)
My second QSC order after being a long-time customer of another vendor. The switch was entirely because of the US warehouse. Why wait 2 weeks when you can get the same quality in 3 days? Tirzepatide at 98.7% purity. Packaging was clean and discreet. Apple Pay payment worked smoothly. QSC has earned another loyal customer. The warehouse model is the future of this industry.
BB
Beth H.
January 18, 2026
Verified Purchase
★★★★★
Product: TB-500 10mg x 5 vials + BPC-157 5mg x 10 vials (US Warehouse)
Healing peptide combination from QSC. TB-500 at 98.3% and BPC-157 at 99.1% purity on Janoshik testing. Both excellent results. US warehouse shipping was 3 days. The COAs were thorough with full HPLC chromatograms. I track all my peptide research orders in a spreadsheet and QSC's purity averages are consistently high. Reliable vendor with an unbeatable delivery model for US customers.
NN
Nick V.
January 14, 2026
Verified Purchase
★★★★★
Product: Semaglutide 5mg x 3 vials (US Warehouse, starter order)
First time ordering peptides and QSC made the experience very smooth. The US warehouse meant domestic shipping with real USPS tracking. Arrived in 3 days. Semaglutide tested at 99.0% via Janoshik. The included COA was easy to read and everything checked out. For someone new to this, QSC's streamlined ordering process and fast domestic delivery made the whole experience less intimidating. Great first experience, will reorder.
Write a Review
Have you purchased from Qingdao Sigma Chemical? Share your experience to help the community. You must have a registered account with 30+ days age and 10+ posts to submit a review.
Frequently Asked Questions
How does QSC's warehouse network work?
QSC manufactures products at their headquarters in Qingdao, China, then pre-stocks popular items in warehouses located in the US, UK, Canada, EU, and Australia. When you place an order, it ships from the warehouse closest to your location, providing domestic-speed delivery without international customs delays. Inventory is managed centrally and restocked regularly.
What happens if a product is out of stock at my local warehouse?
If a product is temporarily unavailable at your local warehouse, QSC will notify you and offer two options: wait for restocking (typically 5-10 days) or ship directly from China. Customer service is transparent about stock levels and expected restock dates.
Are QSC products Janoshik tested?
Yes. QSC submits products to Janoshik Analytical for independent HPLC purity analysis and mass spectrometry identity confirmation. They are also a registered vendor with PeptideMeter Analytics. Batch-specific COAs are provided with every order and community members are encouraged to verify independently.
When was QSC founded and how large is the team?
QSC was founded in 2017 in the Shibei District of Qingdao, Shandong Province, China. The company now employs over 50 people including synthetic chemists, quality engineers, logistics specialists, customer support staff, and R&D personnel. This team structure supports their global manufacturing and distribution operations.
Does the 10% crypto discount apply to warehouse orders?
Yes. The 10% cryptocurrency discount applies to all orders regardless of which warehouse ships the product. The discount is applied automatically at checkout when you select Bitcoin, USDT, or Ethereum as your payment method.
Is the delivery guarantee valid for warehouse shipments?
Yes. QSC's 100% delivery guarantee covers all shipments whether from a local warehouse or direct from China. If a package is lost in transit, they will reship at no additional cost. Warehouse shipments use domestic couriers with full tracking, so loss rates are extremely low.