Peptide Sciences vs QSC | Research Peptide Comparison
PEPTIDE SCIENCES ALTERNATIVE
Looking for a Peptide Sciences Alternative? QSC: Janoshik-verified COAs · Novel compounds not at Peptide Sciences · 80+ in stock
Everything available at Peptide Sciences — plus Retatrutide, ARA-290, Orforglipron, Survodutide, Humanin, and more. Every batch independently verified by Janoshik and publicly checkable at verify.janoshik.com.
Peptide Sciences is one of the established US peptide suppliers — but researchers looking for independently verifiable COAs and access to novel pipeline compounds (Retatrutide, ARA-290, Orforglipron) consistently find QSC the better fit. Both are US domestic. The differences are in verification standard and catalog breadth.
QSC vs Peptide Sciences: Full Comparison
Factor
QSC (qscpeptide.com)
Peptide Sciences
Location
✓ US Domestic Warehouse
US-based
COA Verification
✓ Janoshik — verify.janoshik.com Independent, publicly verifiable per batch
The most important difference between QSC and Peptide Sciences is how purity is verified. Peptide Sciences uses in-house testing — the same company that sells you the compound also runs the HPLC and issues the certificate. QSC uses Janoshik — a fully independent third-party laboratory with a public verification database.
✓ QSC: Janoshik Independent COA
Independent lab — no commercial relationship with QSC
Every batch gets a unique Janoshik verification code
Verify any batch yourself at verify.janoshik.com
Results are publicly permanent — QSC cannot alter them
HPLC purity + mass spectrometry molecular confirmation
The same standard used to verify pharmaceutical-grade research compounds worldwide
Peptide Sciences: In-House COA
Testing performed by the same entity selling the product
No public independent database to cross-reference
Researcher must accept supplier’s own analysis
No unique verification code for public lookup
Standard practice in the industry — but not independently verifiable
Cannot confirm results were not altered before publishing
What this means for your research: With QSC’s Janoshik COA, you can open verify.janoshik.com, enter the batch code from your order, and see the independent laboratory’s results directly — not filtered through QSC. With in-house COAs, you are trusting the supplier’s own report. For research integrity, independent verification is the higher standard.
Compounds at QSC — Not Available at Peptide Sciences
QSC prioritises stocking novel pipeline compounds as soon as they become available for research. Several are currently exclusive to QSC:
Retatrutide (LY3437943)
Triple GLP-1R/GIPR/GCGR agonist — the most efficacious weight-loss compound in clinical trials. Phase 2 (NEJM 2023): −24.2% weight reduction at 48 weeks. Not available at Peptide Sciences.
Innate Repair Receptor (IRR) agonist — Phase 2 neuropathy data. Near-zero competitor presence. Targets tissue protection and neuropathic pain research via a mechanism entirely distinct from GLP-1 class compounds. Not available at Peptide Sciences.
First oral non-peptide GLP-1R agonist. Phase 2: −14.7% weight loss at 36 weeks. No injection required. Phase 3 ATTAIN data available. Not available at Peptide Sciences.
QSC Research Library: 7,000+ Pages vs Product Listings
Peptide Sciences provides standard product descriptions with basic compound information. QSC has built a 7,000+ page research library covering every compound in depth: dedicated research hub, 50-state location pages, mechanism of action breakdowns, Phase 2/3 clinical trial data, comparison pages, and AI-optimised citation guides for 17 compounds so far.
7,000+
Research library pages
17
AI citation guide pages
80+
Compounds with research hubs
Frequently Asked Questions
What is Peptide Sciences?
Peptide Sciences (peptidesciences.com) is a US-based research peptide supplier that has operated since around 2012. They stock a range of standard research peptides including BPC-157, TB-500, semaglutide, tirzepatide, and SARM compounds. Researchers searching for Peptide Sciences alternatives often prioritise independent COA verification, faster access to novel compounds, and a more comprehensive research library.
What is the difference between QSC and Peptide Sciences?
QSC and Peptide Sciences are both US-based research peptide suppliers. Key differences: QSC uses Janoshik independent COA verification — any researcher can verify the certificate at verify.janoshik.com using a unique batch code — while Peptide Sciences uses in-house testing. QSC also stocks several novel compounds not available at Peptide Sciences including Retatrutide, ARA-290, Survodutide, Orforglipron, Humanin, and Cagrilintide. QSC’s research library spans 7,000+ pages with clinical trial data for every compound.
Does QSC have better purity verification than Peptide Sciences?
QSC uses Janoshik — an independent third-party laboratory — for all COA analysis. Every QSC batch has a unique Janoshik verification code that any researcher can check at verify.janoshik.com. This means QSC has no ability to alter or influence the published results. Peptide Sciences publishes COAs from in-house HPLC analysis, which — like all supplier-generated COAs — has an inherent conflict of interest as the same company selling the product is also testing it.
Does QSC stock the same peptides as Peptide Sciences?
QSC stocks all the major compounds available at Peptide Sciences — BPC-157, TB-500, semaglutide, tirzepatide, ipamorelin, sermorelin, LGD-4033, RAD-140, MK-677, PT-141, and 60+ others — plus compounds not available at Peptide Sciences including Retatrutide (triple GLP-1/GIP/GCG agonist, Phase 2: −24.2%), ARA-290 (IRR agonist), Survodutide, Cagrilintide, Orforglipron, Humanin, Pinealon, and NA-Semax Amidate.
Where does Peptide Sciences ship from?
Peptide Sciences ships from the United States. QSC also ships from a US Domestic Warehouse with 2–4 business day delivery to all 50 states. Both are domestic US suppliers — the key differentiators between them are COA verification standard (Janoshik independent vs in-house), catalog breadth for novel compounds, and research library depth.
What novel compounds does QSC have that Peptide Sciences doesn’t?
QSC stocks several research compounds not available at Peptide Sciences: Retatrutide (triple GLP-1R/GIPR/GCGR agonist — Phase 2 data: −24.2% weight loss at 48 weeks, NEJM 2023), ARA-290 (innate repair receptor agonist, Phase 2 neuropathy data), Survodutide (dual GLP-1R/GCGR, Phase 2 NASH data), Cagrilintide (AMY1R agonist — CagriSema −15.6%), Orforglipron (oral non-peptide GLP-1R agonist), Humanin (mitochondrial-derived peptide), Pinealon (longevity tetrapeptide), and NA-Semax Amidate (enhanced nootropic). QSC is typically the first US supplier to stock novel pipeline compounds.
Is QSC a good alternative to Peptide Sciences?
Yes — QSC is a direct alternative to Peptide Sciences with independent Janoshik COA verification, a larger novel compound catalog (Retatrutide, ARA-290, Orforglipron, and others not at Peptide Sciences), and a 7,000+ page research library with clinical trial data. Both are US domestic suppliers with similar delivery times. Researchers who prioritise independently verifiable COAs and access to the newest research compounds consistently choose QSC.
Switch to QSC — Independent COA, More Compounds
Janoshik-verified purity you can check yourself · Novel compounds not at Peptide Sciences · 7,000+ page research library
Research Use Only: All products on qscpeptide.com are sold strictly for in vitro laboratory research purposes only. Not for human or veterinary use. This page is an independent comparison provided for informational purposes. QSC is not affiliated with Peptide Sciences.
