All blends are pre-weighed at the listed ratios, lyophilized, and ship with the same third-party COA standard as our individual peptides. Compositions are independently verified by LC-MS before release.
Bacterial endotoxin tested per pharmacopeial standard on each lot. Pass/Pass on duplicate replicates before release.
02 / Identity
LC-MS confirmed
Each lot is independently identity-confirmed by liquid chromatography mass spectrometry at an external diagnostics lab.
03 / COA
Published per lot
Every lot’s Certificate of Analysis is published in our public, on-site COA library and matched to the lot ID printed on the vial. Look up any lot before or after you order.
04 / Sourcing
USA-synthesized
Compounds are synthesized and lyophilized in the USA. Same-day fulfillment from our US warehouses on orders placed before 2 PM Central.
Research peptides with traceable chemistry, batch by batch.
Koi Peptides was started in 2022 by a small group of researchers and chemists tired of vials that did not match their labels. After four years of supplying clients offline, the catalog opened online in 2026.
Every peptide is synthesized and lyophilized in the United States, batch-tested by an independent accredited laboratory, and traceable to a dated certificate. Researchers in the United States, Canada, and other markets can now order directly.
≥99% purity target — the exact value for your lot is stated on that lot’s COA. HPLC-verified, LC-MS confirmed, lyophilized in the US under controlled conditions.
02
Third-Party Verified
Independent labs run the tests. The COA is dated to your batch and published on the product page before the order ships.
03
Free & Fast Shipping
Free shipping over $200. Same-day dispatch on orders placed before 2 PM CT, Monday through Friday.
Frequently asked
Common questions, answered.
What are research peptides?
Research peptides are short amino-acid chains supplied for laboratory and in-vitro study only not for human or animal use. Koi synthesizes research-grade peptides in the US and verifies every lot for purity and identity. Browse all research peptides for sale in our catalog.
Who can buy peptides for sale from Koi Peptides?
Our peptides for sale are available to researchers, laboratories, and qualified institutions for research use only (RUO) — not as drugs, supplements, or for human consumption. See our FAQ page for ordering details.
What purity are your research peptides, and how is it verified?
Every Koi peptide is released against a ≥99% HPLC purity criterion. Each lot is tested in-house and re-run by an independent ISO/IEC 17025 lab, with each lot’s COA published on its product page. Learn how purity and identity testing differ in our guide to HPLC vs. mass spectrometry.
Do your peptides come with a Certificate of Analysis (COA)?
Yes — every order includes a lot-specific COA, and you can look up the record for any batch in our public COA library. New to COAs? Read how to read a peptide COA.
What endotoxin levels do your research peptides meet?
Our release spec is <0.5 EU/mg, verified per lot — critical for reproducible cell-culture and in-vitro work. Here's why endotoxin levels matter.
How should I store lyophilized peptides?
Lyophilized (freeze-dried) peptides are stable at room temperature for short-term handling; for long-term storage keep them at −20 °C, away from light, and avoid repeated freeze–thaw cycles. Reconstituted peptide should be refrigerated and used within the window noted on its COA.
How fast do you ship, and where from?
We offer same-day fulfillment from our US warehouses on orders placed before 2 PM Central, with free shipping over $200. Tracking is included on every order.
Are these peptides safe for human use?
No. All Koi peptides are sold strictly for laboratory research use only not for human or animal consumption, diagnostic, or therapeutic use. See our quality & compliance standards.
Is it legal to buy research peptides?
Yes — research peptides can be purchased in the US for laboratory research use only. They are sold as research reagents, not as drugs or supplements, and are not approved for human or veterinary use. Review our research-use terms and quality standards before ordering.
Why buy research peptides from Koi Peptides?
Koi synthesizes and lyophilizes peptides in the US, tests every lot in-house, re-runs it at an independent ISO/IEC 17025 lab, and publishes a COA you can match by lot ID. More on our process on the About page.
What's the difference between HPLC purity and mass-spec identity?
HPLC measures purity (how much of the sample is the target peptide); mass spectrometry confirms identity (that it's the correct molecule by mass). Trustworthy research peptides report both.
Do you sell peptide blends?
Yes — alongside single peptides, we offer research blends like KLOW and BPC-157/TB-500 (Wolverine). Browse all peptide blends in the catalog.
Registered US office
Sheridan, Wyoming.
All correspondence, legal notices, returns, and lot-release fulfillment originate from a single US-registered address.
Registered office · WY
Mailing & legal address
Koi Research Labs LLC 30 N Gould St, Ste R Sheridan, WY 82801 United States
All correspondence, legal notices, and returns paperwork.
