Research peptides: frequently asked questions

Research peptides are synthetic peptides (short chains of amino acids joined by peptide bonds) supplied for in-vitro and preclinical laboratory research. They are not licensed medicines, and suppliers label them for research use only.

See: What are peptides? · Glossary

Research use only means a product is intended solely for laboratory research. It is not for diagnostic or therapeutic use and must not be administered to people or animals. Every Peptaro product is supplied on that basis, and checkout requires three research-use confirmations.

High-performance liquid chromatography (HPLC) separates the components of a sample. Purity is reported as the target peptide’s peak area as a percentage of all UV-absorbing peaks detected. Every Peptaro batch is tested by an independent laboratory, Janoshik or Marfleet.

See: How we test

HPLC purity is the share of the target peptide among the peptide-like components detected. Net peptide content is the share of the powder’s mass that is peptide, as opposed to counter-ions (such as acetate or TFA) and residual water. A batch can be 99% pure with a lower net peptide content.

A certificate of analysis is a laboratory report for one specific batch. It states the identity and purity results, the methods used, the testing laboratory and the test date. Peptaro matches each vial’s printed batch number to the documentation that ships with your order.

Lyophilised means freeze-dried. The peptide solution is frozen and the water is removed by sublimation under vacuum, leaving a dry powder or "cake" that is more stable in storage than a solution. A small cake can make a vial look almost empty.

Divide the peptide mass by the diluent volume: 5 mg in 2 mL gives 2.5 mg/mL, which is 2.5 µg/µL. The concentration calculator works this out in laboratory units and gives aliquot volumes and counts.

See: Concentration calculator · Reconstitution guide

Many research peptides can be bought in the UK for laboratory research, but the position depends on the compound and on how it is marketed and used. Peptaro supplies research compounds only, does not supply licensed medicines, and gives no usage advice.

See: Are peptides legal in the UK?

Orders placed and paid before 3pm, Monday to Friday, are dispatched the same day. Orders placed after 3pm, at the weekend or on a bank holiday go out on the next working day. Bank transfer orders are dispatched as soon as the payment reaches us.

Delivery is free on every order: Royal Mail Tracked 24, dispatched the same working day for orders placed before 3pm UK time.

Most orders arrive the next working day after dispatch. Every order goes by Royal Mail Tracked 24, which aims for next-day delivery. That is Royal Mail's target rather than a guarantee, so allow a little longer at busy times.

Your tracking number is in the dispatch email we send when your parcel is handed to Royal Mail. If you ordered with an account, you can also see the order status in your account .

Orders ship sealed and securely packed for transit. Every vial is labelled with the compound, amount and batch number.

No. We deliver to UK addresses only.

Three ways to pay: Debit or credit card: Visa, Mastercard, Amex, Apple Pay and Google Pay Open Banking through Fena, approved in your own banking app Bank transfer, with no fee

Yes. Card details are entered into our payment provider's encrypted form and protected by 3D Secure, and Open Banking payments are approved inside your own banking app. We never see or store your card number or bank login.

Yes. We supply research quantities from £299 per order, and you can mix any products to reach it. Every order ships free by tracked delivery, cold-packed with its batch certificates. Each research kit meets the minimum on its own.

No. You can check out as a guest. An account lets you see your order status and reorder in a couple of clicks.

Choose Bank Transfer at checkout and we show our account details with your order reference. Pay from your banking app quoting that reference. Transfers usually arrive within one working day, and we dispatch as soon as the money lands.

Please don't pay again. Check your spam folder first. If it isn't there, email help@ukpeptidelab.co.uk with your name and roughly when you paid, and we will match the payment to your order.

Yes, free of charge, up until it is dispatched. Email us with your order number as soon as you can. Once the parcel is with Royal Mail it can no longer be changed.

Check the tracking link in your dispatch email first. If the parcel hasn't moved or is late, email us with your order number within 48 hours of the expected delivery date. If Royal Mail confirms it lost, we send a free replacement.

We can't accept returns of research peptides. Once a vial has left us we can't verify how it has been stored, so it can't be resold. Anything that arrives damaged, wrong or lost is covered by our free replacement guarantee. Full details are in our returns policy .

Where we can't send a replacement, yes, for example when a product is permanently out of stock. Refunds are at our discretion and go back to your original payment method within 5 to 10 working days of approval.

Within one working day, Monday to Friday, and usually sooner. Email help@ukpeptidelab.co.uk or use our contact form .

Independent laboratories, never us. Batches tested from September 2026 have been tested by Janoshik Analytical. Certificates published for earlier batches were issued by Marfleet Analytical Services, and those reports remain published for the batches they cover. Where a batch has no independent report, the certificate is labelled supplier-reported and independent verification is pending. No figure on this site is produced by us.

On the product page, alongside the batch number. The QR code on the vial label opens the certificate for that exact batch, so you can match it to the vial in your hand. We don't post paper copies. The published certificate is the record.

Yes. Every report on this site names the laboratory that issued it and carries its report or test number, so you can check it against the laboratory rather than taking our word for it. Janoshik reports carry a test number that can be looked up on janoshik.com. Reports from other laboratories are published as PDFs and have no public verification page, so ask us for the reference if you want to check one directly.

The exact figure is on each batch's certificate. Purity is measured by HPLC for every tested batch, and we publish the measured number rather than a rounded headline, so check the certificate for the batch you are buying. See how we test for more detail.

That is normal. A freeze-dried peptide is only a few milligrams of powder, so it can look like a thin film or a small pellet at the bottom of the glass. If a vial is cracked or the seal is broken, email us within 48 hours of delivery and we will replace it.

As lyophilised (freeze-dried) powder in sealed glass vials. Each vial is labelled with the compound name, amount, batch number and storage guidance. The exceptions are Bacteriostatic Water and L-Carnitine, which are supplied as ready-to-use liquids in 10ml vials and need no reconstitution.

Unless the product page says otherwise, keep sealed vials at -20°C, dry and away from light. Once reconstituted, keep them at 2-8°C and follow the timeframe in the product documentation.

No, it is sold separately. You can add bacteriostatic water 10ml to your basket from the shop.

Yes. Our reconstitution guide covers the laboratory steps, and the free reconstitution calculator works out concentrations for you.

No. Our products are sold for laboratory research only, and we don't give dosing, usage or medical advice. Our support team can help with orders, delivery and batch documentation.

Yes. UK Peptide Lab is a UK registered business, based at 71-75 Shelton Street, London, WC2H 9JQ. Full company details are on our About page . Orders are dispatched from within the UK. Our registered office is 71-75 Shelton Street, London WC2H 9JQ. It handles official post only, so please don't send parcels there.

In-vitro research and laboratory use only. They are not for human consumption, veterinary use or therapeutic use of any kind.

Anyone aged 18 or over buying for laboratory research. You confirm both when you enter the site.

Yes. Discounts apply automatically in your basket, with no code needed: 5% off every vial once your basket holds 3 or more vials, any mix of products 8% off every vial once your basket holds 5 or more vials, any mix of products 12% off every vial once your basket holds 10 or more vials, any mix of products Bacteriostatic water is not included in bulk discounts.