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We're a small group of researchers and chemists based in the US. After spending enough years buying research peptides from suppliers whose vials never matched the label, we started Koi in 2022.
We were tired of guessing and ruining our experiments, so we ran a test. We ordered the same peptide, BPC-157, from five different vendors and sent each one to an independent lab. Three of the five failed.
All five product pages had mentioned 100% purity, and at least two were using the same uploaded COA PDF they had been using for months.
That was the moment Koi went from idea to plan. The name comes from the koi fish. There's a saying among Japanese koi keepers — "you don't keep koi, you keep water." The fish are only as good as what surrounds them. We believe a peptide is similar. The molecule on the bench is only ever as good as the lab that made it, the conditions it was lyophilized in, the cold chain it shipped through, and the testing that confirmed it before the vial went out.
Peptides are one of the most active areas of laboratory research, with thousands of sequences now studied in vitro.
The reasons are practical: peptides bind their target receptors with high selectivity, which makes them precise tools for receptor and pathway research, and solid-phase synthesis for sequences up to roughly 40 amino acids is now mature enough to manufacture reproducibly at high purity.
That work, from cell-based assays and receptor-binding studies to in vitro pathway research and animal models, depends on research-grade peptide material that is clean, correctly identified, and consistent batch-to-batch. Without that, the data going into the next stage isn't usable.
Every Koi peptide is synthesized and lyophilized in the United States. The vial that reaches a buyer is the vial that was filled at our partner facility, no overseas drop-shipping or third-party warehouses in the chain.
Independent ISO/IEC 17025-accredited lab. The panel covers HPLC purity, LC-MS identity, mass and weight verification, sterility, endotoxin (LPS), and residual TFA.
The COA published on the product page is the COA for the batch in the vial. Nothing recycled across batches.
Weighted toward tissue, metabolic, neuropeptide and cellular aging research. Browse the full catalog of 100+ peptides and research blends.
Orders placed before 2 PM CT (Mon-Fri) ship the same business day. Insulated packaging with cold packs is available at checkout.
Set close to the cost of synthesis and testing, with volume discounts above five vials.
Email or contact form, answered by someone on the team, usually same business day.
A few things we deliberately don't do.
We don't make claims about effects in people. Every product is for laboratory research only.
We don't publish customer testimonials describing personal effects.
We don't add a peptide to the catalog the same week it goes viral.
New compounds run through the same QC process as the rest of the catalog, which takes the time it takes.
Yes. Every batch ships with a third-party COA (HPLC + Mass Spectrometry), and the same document is published on each product page with the batch number and test date.
Each Koi peptides COA carries a unique identifier issued by the testing lab. You can cross-reference the document directly with the lab's verification system to confirm it's authentic. If anything on a COA looks inconsistent, email us, and we'll put you in touch with the lab contact.
No. Koi peptides are for laboratory and research use only and are not for human consumption. They are sold exclusively to qualified researchers and licensed laboratories. These products are not drugs, foods or cosmetics, have not been evaluated by the FDA, and are not intended to diagnose, treat, cure, or prevent any disease.
Every batch goes to an independent ISO/IEC 17025-accredited laboratory for HPLC purity, LC-MS identity confirmation, mass and weight verification, sterility, endotoxin (LPS) level, and TFA content. A batch is not released for sale until the full panel is on file.
Lyophilized vials should be stored at -20 °C, sealed and protected from light and moisture. Once dissolved in a sterile diluent, store at 2-8 °C and use promptly. Avoid repeated freeze-thaw cycles, and follow standard aseptic technique throughout handling.
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• ≥99% purity target • Third-party tested • COA per batch • Fast US shipping
For research use only — not for human or veterinary use. Products are laboratory research chemicals, not drugs, supplements, or food.
