Research peptides · Compounds · Analytical testing

Purity,
verified.

Kiyoshi (清) means pure. It's the name on every vial and the standard behind every lot: synthesized with care, tested independently, documented before it ships.

Browse the peptide menu Lab testing services

All products are sold strictly for laboratory research use only. They are not for human or veterinary use, diagnosis, or treatment.

Our Story

The name is the standard.

In research, an impurity is a variable you didn't choose. A few percent of truncated sequences, residual solvent, or a mislabeled vial can quietly undo weeks of work.

We named the company Kiyoshi, a Japanese word for purity and clarity, because that's the only thing that matters in a vial. No marketing language should stand in for data. Every lot we release is tested, documented, and traceable, so the result you record is the result of your experiment and nothing else.

  1. 01

    Synthesized with intent

    Sourced from vetted synthesis partners and lyophilized to keep material stable.

  2. 02

    Verified, lot by lot

    Purity and identity are confirmed analytically before any lot is released.

  3. 03

    Documented and traceable

    Every vial maps to a lot number and its Certificate of Analysis.

Lab Testing

Independent analytical testing

Already have material? Send it to us. We run the same analyses we use to release our own lots and return a clear, documented report.

HPLC purity analysis

Quantifies the target compound against related impurities and degradation products.

Mass spec identity

Confirms molecular weight so you know the compound in the vial is the one on the label.

Endotoxin screening

Screens for bacterial endotoxin contamination that can confound research results.

Certificate of Analysis

A clean, lot-specific report with methods, results, and chromatograms.

Pricing and turnaround depend on the analysis and sample count.

Request a testing quote

Quality Standard

From synthesis to your bench

  1. Synthesis

    Produced by qualified synthesis partners to defined specifications.

  2. Analysis

    Each lot is tested for purity and identity before release.

  3. Release

    Only lots that meet spec are labeled, sealed, and assigned a COA.

  4. Delivery

    Lyophilized vials are packed to protect stability in transit.

FAQ

Common questions

Can't find an answer? Send us a message.

How does ordering work?

Add products to your order and submit the request. We confirm availability, pricing, and lot details, then send an invoice with payment instructions. Your order ships once payment is received.

Who can purchase from Kiyoshi Labs?

Our products are sold only to qualified purchasers, age 21 or older, for legitimate laboratory research. By placing an order you confirm that materials will be handled by trained personnel and used only for in-vitro or laboratory research.

Are these products for human use?

No. All products are strictly for research use only. They are not drugs, food, or cosmetics, and are not intended for human or veterinary use, diagnosis, or treatment. We can't offer dosing or usage guidance.

Do you provide a Certificate of Analysis?

Yes. Every lot is documented with a Certificate of Analysis, available on request for any product, before or after you order.

How should lyophilized peptides be stored?

Lyophilized material is generally stored sealed, cold, dry, and away from light. Specific storage notes are included with each product's documentation.

Can you test material I bought elsewhere?

Yes. Our lab testing service accepts outside samples. Request a quote and we'll send submission instructions.

Contact

Talk to the lab

Questions about an order, a COA, custom sourcing, or testing? Send a note and a member of our team will follow up.

Your order

    Your order is empty.

    Pricing and shipping are confirmed on your invoice. No payment is taken online.