Precision-Grade
Peptides.
Proven by Data.
Retatrutide, BPC-157, Semax, Selank, MOTS-C, GHK-Cu, and more — each compound independently tested by HPLC and LC-MS, with a lot-specific Certificate of Analysis included with every order.
≥99%
Min. Purity
Next Day
UK Delivery
13
Compounds
100%
CoA Rate
Popular Compounds
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Why Defined Labs
The Defined Labs standard
Third-Party Verified
Every batch independently tested by an accredited laboratory — not in-house. You get the actual raw data, not just a claim.
HPLC + LC-MS Confirmed
Dual analytical methods: HPLC confirms purity ≥99%, LC-MS confirms molecular identity. Both reports ship with your order.
Lot-Specific CoA
Your Certificate of Analysis is specific to your exact batch number — not a generic document shared across products.
Next Day UK Delivery
All in-stock compounds dispatched same business day. Temperature-controlled packaging as standard on every order.
Cold-Chain Packaging
Peptides are sensitive. Every order leaves us packed to maintain integrity from our facility to yours.
GMP-Sourced
All raw materials sourced from GMP-compliant manufacturers using Fmoc solid-phase synthesis. Quality starts at the source.
Our Process
How every compound
reaches your lab
GMP Synthesis
Compounds synthesised by GMP-compliant manufacturers using Fmoc solid-phase synthesis. Raw materials verified before acceptance.
HPLC Purity Test
Every batch sent to an independent laboratory. Nothing ships below ≥99% purity — no exceptions.
LC-MS Identity
Mass spectrometry confirms compound identity on every batch. You receive the actual spectra, not a summary.
Cold-Chain Dispatch
Lot-specific CoA issued and order dispatched next day in temperature-controlled packaging, tracked to your door.
Every Order
What you receive
with every order
We don't just ship a vial. Every Defined Labs order is dispatched with the documentation and packaging that serious research requires. No shortcuts.
Shop NowLot-Specific Certificate of Analysis
Your exact batch number. HPLC purity data and LC-MS identity confirmation — not a generic shared certificate.
HPLC & LC-MS Analytical Data
Full chromatography and mass spectrometry reports for every compound. Raw data you can verify independently.
Lyophilized Peptide in Sealed Vial
Freeze-dried for maximum stability and shelf life. Sealed, inert glass vial ready for reconstitution.
Cold-Chain Temperature Packaging
Every order packed with temperature-controlled materials to preserve peptide integrity from dispatch to your door.
13 verified compounds.
One trusted source.
Retatrutide, BPC-157, Tesamorelin, Semax, Selank, MOTS-C, GHK-Cu, IGF-1 LR3, and more — all in stock, all independently tested, all shipped with your Certificate of Analysis.
All products sold by Defined Labs are strictly for in vitro research and laboratory use only. Not for human or veterinary use. By purchasing you confirm you are a qualified researcher using these products solely for lawful scientific research purposes.