Research peptides are short chains of amino acids — typically 2 to 50 residues — synthesized for in-vitro laboratory research. Scientists use them to study biological processes, receptor binding, cell signaling, and related mechanisms. Our peptides are sold strictly for in-vitro research and are not intended for human consumption or in-vivo use.

No. All Czech Peptide products are sold strictly for research and laboratory use. They are not intended for human consumption, veterinary use, or any clinical application. By purchasing, you confirm that you are a qualified researcher or institution.

Every product ships to its supplier’s published batch specification for identity and purity. Selected lots are independently tested by Janoshik Analytical, Liquilabs.cz, or Finnrick.com — where a lot has a published report, its measured purity is shown. Across our published Janoshik reports, average HPLC purity is 99.4%.

We accept bank transfer to our IBAN (see our Company & Payment Details section), and cash on delivery for an additional fee. Card payments aren’t currently offered.

We deliver within the Czech Republic and Slovakia only, typically 3–5 working days, to a parcel pickup point or directly to your address. You’ll receive a tracking number by email once your order ships.

⚠ Confirm your same-day dispatch cutoff time before publishing — not yet established.

Contact us within 48 hours of delivery with photos of the outer box, inner packing, and any affected vials with labels legible. Confirmed transit damage is replaced at no additional cost.

Orders can be cancelled or modified within 2 hours of placement, provided they haven’t been dispatched yet. Message us on WhatsApp or email immediately if you need to make a change.

Lyophilized (freeze-dried) peptides should be stored at -20°C for long-term storage, or 2–8°C for short-term use. Once reconstituted, keep peptides at 2–8°C and use within 2–4 weeks. Keep them away from light, heat, and moisture at all times.

Use bacteriostatic water or sterile water for injection. Add the solvent slowly along the inside wall of the vial — don’t shake or vortex it. Let the peptide dissolve on its own, usually within 1–2 minutes. Once reconstituted, use the dosing calculator elsewhere on this site to work out exactly how much to draw for your target dose.

A COA is the independent third-party test report for a specific lot — for us, that’s the Janoshik Analytical, Liquilabs.cz, or Finnrick.com report for lots we’ve had independently tested. It documents identity, HPLC purity, and the test date. Not every lot has a published report; contact us with your batch code and we’ll send you the relevant one on file.

We work with verified suppliers and independent labs rather than running testing in-house. Selected lots are tested by Janoshik Analytical, Liquilabs.cz, and Finnrick.com for HPLC purity and identity. Every other product ships to its supplier’s tested batch specification.

Email info@czechpeptide.com within 14 days of delivery with your order number and the reason for your return. We’ll confirm eligibility and send return instructions.

⚠ Confirm your actual response-time target for return requests before publishing.

Contact us immediately. We’ll arrange for the correct product to be sent at no additional cost, along with instructions for returning the incorrect item.

Because of the nature of research chemicals, we can’t accept returns of opened or used products. Unopened products in their original sealed packaging may be returned within 14 days of delivery, under your right of withdrawal in EU consumer law. We refund your original payment method within 14 days of receiving your withdrawal notice, and may hold the refund until we receive the goods or you send proof of dispatch — whichever comes first. Return shipping is paid by you, unless the return is due to our error.