A practical checklist for researchers: testing, certificates, where stock is held, delivery, payment and the red flags worth walking away from.
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A supplier testing its own stock is a start. An independent third-party laboratory is better. Look for more than a purity figure:
A generic certificate on a product page tells you about one batch at one time. Ask whether you can get the certificate of analysis for the batch you actually receive, and check the batch details against your vial.
UK-held stock means no customs delays and a clear UK delivery promise. Check the supplier lists a real UK address, not just a contact form.
Look for a tracked service with a stated delivery time and a clear price. Untracked post leaves you with nothing to follow up.
A card option with a recognised payment provider gives you more protection than bank transfer alone. Check that card details are handled by the provider, not stored by the shop.
| What to compare | Pep Labs UK | Ask your current supplier |
|---|---|---|
| Independent testing | Third-party lab: HPLC purity, endotoxin, TAMC/TYMC and heavy metals | Who tests it, and for what beyond purity? |
| Batch certificate | COA for your batch on request, quoting your order number | Can I see the COA for the batch I receive? |
| Stock location | Held and packed in Liverpool, UK | Does it ship from the UK or from abroad? |
| Delivery | Royal Mail Tracked 24 (1–2 working days). £4.99, free over £100 | Is it tracked, and how long does it really take? |
| Payment | Card or crypto. Card details handled by our payment providers | Can I pay by card, or crypto only? |
| Support | UK team at [email protected], replies on working days | Is there a real UK contact and address? |
| First order | 10% off with WELCOME10 | What do I get for trying you? |
We don’t name or describe other suppliers. The right-hand column is a question to put to them, not a claim about them.
Research peptides and blends are in the full catalogue.
Bacteriostatic water for the laboratory reconstitution of lyophilised research compounds.
Yes. Our products are third-party tested, and a COA confirming purity can be requested for your batch. See our COA page or contact support with your order number.
Orders go out from Liverpool on working days by Royal Mail Tracked 24, usually 1–2 working days. £4.99, or free on orders over £100.
Card and crypto. Card details are processed by our payment providers and never stored by us.
Our peptides and blends are supplied lyophilised (freeze-dried powder) in sealed vials.
Buyers aged 21 or over, purchasing for laboratory research use only.
Use WELCOME10 at checkout for 10% off your first order.