Frequently asked questions
Quick answers about testing, shipping, storage and ordering.
Are your products independently tested?
Yes — our compounds are independently tested by an accredited third-party laboratory for HPLC purity and mass-spectrometry identity, and we publish those certificates of analysis on our Lab Results page.
How fast do orders ship?
In-stock items ordered before 2pm Monday to Friday dispatch the same business day, in insulated, discreet packaging. Made-to-order items (pen refills and nasal sprays) are prepared individually for your order and dispatch within 48 hours. Pre-order items dispatch within 28 days, backed by our refund guarantee. UK orders typically arrive within 1–2 business days of dispatch. Full detail is in our Shipping policy.
How should compounds be stored?
Lyophilized peptides should be stored cool, dry and away from light. For long-term storage, keep sealed vials frozen at -20°C. Full guidance is in our Peptide Storage Guide.
Who can purchase from PepSource?
Our products are sold strictly as research reagents for laboratory and in-vitro use by qualified researchers and institutions. They are not for human or veterinary use.
Do you provide dosing advice?
No. PepSource does not provide dosing guidance or advice relating to physiological application under any circumstances. Our reconstitution calculator performs generic laboratory dilution math only.
What is your returns policy?
Standard stocked items can be returned within 14 days of delivery, provided they are unused, unopened and with all seals intact.
Made-to-order items (pen refills and nasal sprays) are prepared individually at the point of ordering, so they are exempt from the 14-day cancellation right under the Consumer Contracts Regulations 2013 and cannot be returned or refunded unless they arrive faulty, damaged or not as described. Please check these items carefully before ordering.
Faulty, damaged or incorrect items are covered for 30 days under the Consumer Rights Act 2015. All returns are arranged by email: contact support@pepsource.co.uk with your order number and we will confirm eligibility and provide the return address — please do not send anything back before contacting us. If a parcel is not collected and is returned to us, a replacement or refund is only processed once we receive the item back. Full detail is in our Refund policy.
Do you offer bulk or wholesale pricing?
Yes — for laboratories and institutions with recurring requirements we offer volume pricing. Get in touch via the contact page with the compounds and quantities you need.
How do I verify my batch's COA?
Every vial carries a batch code. Look it up on our Lab Results page to open its certificate of analysis and confirm identity, purity and mass balance.