Research resource
An 8-point checklist for procurement officers, research-group leads, and individual researchers selecting a UK research-peptide supplier. Practical, vendor-neutral, with reference to standard procurement criteria. We score ourselves transparently against the same checklist at the end.
Research-grade peptides are reference reagents. The quality of the reagent determines the validity of every downstream experiment. Differences between suppliers in HPLC purity, batch consistency, contamination handling, and documentation propagate directly into research data quality. A 95% purity reagent and a 99%+ purity reagent will produce noticeably different in-vitro outcomes in published assays.
Beyond quality, factors like UK-domestic supply (no import customs), batch traceability via independent lab reports, return policy in case of degradation, and supplier reputation all affect total procurement risk. The 8 criteria below are the practical tests we recommend any UK research lab apply when comparing suppliers.
The single most important quality signal is whether each batch is independently tested by a third-party laboratory, not the supplier itself. Self-testing is meaningless - the supplier has incentive to pass their own batches. Independent labs (Janoshik Analytical is the standard for UK research-peptide testing) issue lab reports with unique verification codes that buyers can match against the published purity record.
What to ask: "Which independent lab tests your batches? Can I see a sample report? Is the report shipped with each order?"
The batch-specific COA should ship physically in the box, not just be available on request. The COA matches the batch number printed on the vial label and shows the HPLC purity percentage, mass-spec verification (where applicable), and tested impurity levels. A supplier that does not ship the COA in the box has no proof of quality at the point of receipt.
What to ask: "Does the lab report ship with the order? Can I verify the report's batch number against the vial label?"
UK-domestic supply is the simplest procurement route. UK-registered suppliers carry Companies House identifiers, can issue VAT invoices, and operate under UK consumer protection law. International suppliers add customs, tax, and labelling complexity, plus longer dispatch times.
What to ask: "What is your Companies House registration number? Where is your registered office?"
Dispatch speed and tracking are operational quality signals. Same-day dispatch on weekdays (orders by ~2pm) with Royal Mail Tracked 24 (or Special Delivery) is the UK research-supplier standard. Dispatch speed correlates with operational maturity - suppliers running an organised stock and pick system can ship same-day; less mature operations cannot.
What to ask: "What's your dispatch cut-off time? What courier do you use? Is shipping tracked?"
For research procurement, you need a live support channel for stock checks, batch enquiries, and order modifications. WhatsApp is the standard for fast UK research-supplier support - faster than email, less overhead than phone. Email support is also fine, provided responses arrive within 24 hours.
What to ask: "How quickly do you respond to support enquiries? What channels do you offer?"
Lyophilised peptides ship in sealed glass vials inside foam-padded outer packaging. Discreet plain outer packaging (no compound names visible) is the UK research-supplier standard. Light-sensitive compounds (GHK-Cu, melatonin) should ship in amber vials. Cold-chain compounds may include ice packs.
What to ask: "What does your packaging look like? Are light-sensitive compounds in amber vials?"
Returns for research-grade peptides are different from consumer returns. Most suppliers do not accept returns of opened vials (chain-of-custody integrity), but should accept replacement claims for compounds that fail their own COA on receipt or arrive damaged. The policy should be published clearly and not require special enquiry.
What to ask: Read the supplier's published Returns and Refund pages. (Ours: Returns Policy & Refund Policy.)
Trustpilot reviews from real customers are the standard external signal. A supplier with 0 reviews is unproven; one with hundreds of stale reviews from years ago may have changed quality since. Look for active, recent (last 12 months) reviews on an independent platform. Forum reputation (research-peptide subreddits, Discord) supplements this but is harder to verify.
What to ask: Search the supplier's name on Trustpilot, Reddit, and Google reviews. (Ours: Black & White Peptides on Trustpilot.)
| Criterion | Our answer |
|---|---|
| 1. Independent HPLC verification | Janoshik Analytical, every batch. View sample reports → |
| 2. COA in the box | Janoshik reports supplied with the order where one has been issued for the current batch. |
| 3. UK Company registration | Companies House 16876162, registered England & Wales. Office: 71–75 Shelton Street, London WC2H 9JQ. |
| 4. Same-day dispatch | Order by 2pm UK weekdays - same-day Royal Mail Tracked 24 dispatch. |
| 5. Customer support | WhatsApp +44 7886 853464 · email info@blackandwhitepeptides.co.uk. |
| 6. Packaging | Foam-padded discreet outer; amber vials for light-sensitive compounds (GHK-Cu, melatonin). |
| 7. Returns / refund policy | Published - Returns, Refunds. |
| 8. Independent reviews | Trustpilot - 19 reviews, Excellent rating. |
If you're comparing us against another supplier, run them through the same 8-point checklist and compare answers side by side.