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Research peptides · independently tested

Buy premium research peptides, COA on every batch.

Every vial is third-party tested by Janoshik, with the purity of each batch published before you buy. Shipped worldwide within 24 hours, delivered in 2-3 days.

Shop all peptides → How we test
★★★★★ 4.7 · 210 reviews 200% purity guarantee Shipped in 24h
PeptSelect research peptide vials - for research use only
Third-party tested
Janoshik, every batch
200% money-back
If purity misses the label
Shipped in 24h
Discreet & unbranded
Real human support
Replies in hours, not days
Most verified this month

Bestsellers

Shop all 20 compounds →
3rd-party testedRetatrutide Pen, research use only
Metabolic · 30 mg
Retatrutide Pen
★★★★★ 4.8 (24)
● 99.61% · JanoshikView COA
€299Save up to 15%
Add to cart
3rd-party testedCJC-1295 + Ipamorelin, research use only
Growth Hormone Peptides · 10 mg
CJC-1295 + Ipamorelin
★★★★★ 4.8 (10)
● 99.6% · JanoshikView COA
€79Save up to 15%
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3rd-party testedKlow Pen, research use only
Cosmetic / Skin · 80 mg
Klow Pen
★★★★★ 4.8 (13)
● JanoshikView COA
€219Save up to 15%
Add to cart
3rd-party testedMOTS-c, research use only
Longevity & Mitochondrial · 10 mg
MOTS-c
★★★★★ 4.7 (7)
● 98.66% · JanoshikView COA
€59Save up to 15%
Add to cart
3rd-party testedTesamorelin, research use only
Growth Hormone Peptides · 10 mg
Tesamorelin
★★★★★ 4.8 (12)
● 97.27% · JanoshikView COA
€69Save up to 15%
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By research area

Shop by category

Shop all 20 compounds →
Retatrutide 30mg pre-filled research pen - for research use only
Metabolic
4 compounds
BPC-157 research peptide vial - for research use only
Repair & Recovery
3 compounds
CJC-1295 + Ipamorelin research peptide vial - for research use only
Growth Hormone Peptides
3 compounds
Semax research peptide vial - for research use only
Cognitive
2 compounds
MOTS-c research peptide vial - for research use only
Longevity & Mitochondrial
3 compounds
GHK-Cu research peptide vial - for research use only
Cosmetic / Skin
4 compounds
KPV research peptide vial - for research use only
Immune & Gut
1 compound

Test it. If purity doesn't match the label, we refund 200%.

No questions asked. Send any vial for independent testing - if it misses its stated purity, you get double your money back. That's how sure we are.

Analytical laboratory testing peptide vials
How we test

Three checks on every batch - and you can see them.

Roughly two in five research peptides fail their own purity claims. Ours don't go on the shelf until the proof is published.

Batch purity, published per lot by Janoshik, an independent third-party lab.
Net peptide content on every certificate.
Public COA Vault where every batch ID resolves to its published certificate.
See our process →
Every lot, proven

Recently published certificates

Open the COA Vault →
PSL-26-0576● 99.91%
Melanotan 2
Janoshik · 2026-09-16
PSL-26-0584● 99.96%
PT-141
Janoshik · 2026-09-16
PSL-26-0574● 99.83%
SS-31
Janoshik · 2026-09-16
PSL-26-0578● 95.09%
Glutathione
Janoshik · 2026-09-16
PSL-26-0572● 97.27%
Tesamorelin
Janoshik · 2026-09-15
99.4%
Avg purity
21
Batches published
24h
Worldwide dispatch
4.7★
210 verified reviews
Verified buyers

Rated on what we can prove.

★★★★★
4.7 / 5
210 verified reviews
★★★★★

Pen arrived well cushioned and cold, dispatched the same day.

JV
Joren V.
Verified · Klow Pen
★★★★★

Reordered because the process was painless the first time. Paperwork was there again.

NB
Nadia B.
Verified · Klow Pen
★★★★★

Well protected in transit and refrigerated on arrival exactly as described.

JV
Joren V.
Verified · PT-141
Research desk

From the research desk

All articles →
What Is an Amino Acid? Structure, Side Chains and Sequence Codes Explained
Glossary
What Is an Amino Acid? Structure, Side Chains and Sequence Codes Explained
August 17, 2026
What Is a Peptide Bond? The Amide Link Between Amino Acids Explained
Glossary
What Is a Peptide Bond? The Amide Link Between Amino Acids Explained
August 13, 2026
Tirzepatide: What It Is and What the Published Trials Show
Molecule Overviews
Tirzepatide: What It Is and What the Published Trials Show
August 13, 2026
Good to know

Questions, answered

Are your peptides third-party tested?
Yes. Every batch is tested by Janoshik, an independent laboratory, and its certificate is published in our COA Vault before you buy.
What does "research use only" mean?
Our products are supplied strictly for in-vitro laboratory research. They are not for human or veterinary use, consumption or diagnostics, and we make no medical claims.
How fast do you ship, and do I get tracking?
Orders are dispatched within 24 hours and typically arrive in 2-3 days worldwide, in plain, unbranded packaging with nothing on the outside to identify the contents. We email a tracking link when your order ships.
What is the 200% purity guarantee?
Send any vial for independent testing. If it misses its stated purity, we refund double your money - no questions asked.
How do I verify a batch?
Enter the batch ID from your order in the COA Vault to pull up its certificate and confirm the result on the laboratory's own server.

Get 10% off your first order.

Join the PeptSelect list for a one-time discount code, plus a heads-up when a new batch is tested. For research use only.

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PeptSelect is where researchers buy premium, third-party-tested research peptides online: BPC-157, Retatrutide, Tirzepatide, GHK-Cu, MOTS-c, Semax, Selank and more. Every batch is tested by Janoshik with a published certificate of analysis you can check before you buy. Shipped worldwide within 24 hours, delivered in 2-3 days. For laboratory research use only.