Mixing SolutionBeyond the Standard
In stock — ships same dayPremium Research Peptides. Independently Tested.
Independently third-party tested for HPLC purity and mass-spectrometry identity, with certificates of analysis published on site. Cold-chain handled from synthesis to same-day dispatch.
99%+
Verified purity
Third-party
Lab tested
Cold chain
Protected shipping
Batch-matched certificates of analysis, published and independently verifiable.
Third-party tested
Published certificates of analysis
Cold-chain handling
Temperature controlled
Fast dispatch
In-stock same-day before 2pm
Secure checkout
Discreet packaging
Rewards & referrals
Every order earns. Every referral pays.
Collect PepPoints on everything you buy, and get credit each time a fellow researcher orders on your link.
Most popular
Best sellers
Mixing Solution
Research Peptide
Research Peptide
Research Peptide
Made to order
Made to order
Research Peptide
Research PeptideMade fresh to order
Nasal sprays & pen refills, made fresh for you
We never hold sprays or refills sitting reconstituted on a shelf. Each one is prepared individually the moment you order — so what arrives was made for you, not stored. Because they're custom-made, please allow up to 48 hours to dispatch.
- Prepared individually when you order
- Never stored reconstituted — always fresh
- Dispatched within 48 hours
Our commitment
Standards without compromise
Every compound in our catalogue passes the same uncompromising pipeline before it reaches your lab.
Independent verification
Our compounds are independently tested by an accredited third-party laboratory for HPLC purity and mass-spectrometry identity.
Cold-chain integrity
Lyophilized compounds are stored and shipped under temperature-controlled conditions to preserve stability.
Full traceability
Every vial carries a batch number; where a batch has been tested, its certificate of analysis is published and independently verifiable.
Latest analysis pass
Proof, not promises
We publish third-party certificates of analysis for our tested batches — check identity, purity and mass balance, and verify any result directly with the laboratory.
- HPLC purity — chromatographic purity verified at 99%+
- Mass spectrometry — molecular identity confirmed against reference
- Batch traceability — vial-level batch codes linked to published reports
Quick answers
Frequently asked questions
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 orders placed before 2pm dispatch the same business day. Made-to-order sprays and refills dispatch within 48 hours. Pre-order items dispatch within the stated pre-order window. Everything ships in insulated, discreet packaging.
How should compounds be stored?
Lyophilized peptides should be stored cool, dry and away from light. For long-term storage, keep sealed vials frozen.
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.
What is your returns policy?
Standard stocked items can be returned within 14 days of delivery, unused, unopened and with all seals intact. Made-to-order items (pen refills and nasal sprays) are prepared individually at the point of ordering and cannot be returned or refunded unless they arrive faulty, damaged or not as described. Returns are arranged by email — contact support@pepsource.co.uk with your order number before sending anything back. Full detail is in our Refund policy.