--- title: "Where to Buy P21 in the UK — 3 Trusted Suppliers - PeptideSupermarket®" description: "Where to buy P21 in the UK: compare 3 trusted suppliers from £27.00. Lab-tested options, live pricing and a 30-day price history." url: "https://peptidesupermarket.co.uk/where-to-buy-p21" site: "PeptideSupermarket®" country: "United Kingdom" --- [Home](https://peptidesupermarket.co.uk) › [Peptides](https://peptidesupermarket.co.uk/compare-peptide-prices-uk) › [P21](https://peptidesupermarket.co.uk/peptide/p21) › Where to Buy P21 in the UK UK Buyer's Guide · October 2026 # Where to Buy P21 in the UK Looking for where to buy **P21** in the UK? This guide compares 3 trusted suppliers, with live prices from **£27.00** and a 30-day price history so you can buy with confidence. Cheapest Price £27.00 at Alpha Peptides® Average Price £43.32 10mg dosage Highest Price £75.95 at Cobalt Peptides UK Suppliers 3 compared ### 30-Day P21 Price Trend Based on the 10mg dosage — cheapest, average & highest listed price. Cheapest Average Highest £76 £51 £27 28 Sep 12 Oct 27 Oct 30-Day Low £27.00 Average £29.18 30-Day High £75.95 ## The best places to buy P21 in the UK There are 3 UK suppliers stocking P21 in our index, with prices for the 10mg dosage ranging from **£27.00** up to **£75.95** (average **£43.32**). [Alpha Peptides®](https://peptidesupermarket.co.uk/suppliers/alpha-peptides) is the cheapest option at the time of writing, working out at roughly £2.70/mg. The supplier cards above highlight a few vendors we'd shortlist, and you can open any supplier's profile to read their full delivery, payment and lab-testing details before you buy. ## What to look for in a P21 supplier Buying research peptides is only worthwhile if you can trust what arrives. We'd prioritise suppliers that offer: - **Third-party lab testing** — an independent certificate of analysis confirming purity and concentration. - **UK-based dispatch** — faster delivery, no customs delays, and easier returns. - **Transparent pricing** — clear per-vial and per-mg costs, with no surprises at checkout. - **Verified reviews** — a track record from real customers you can actually check. - **Secure payment and clear policies** — reputable vendors are upfront about shipping times and refunds. ## How much does P21 cost? Expect to pay around **£43.32** for the 10mg dosage, though shopping around can bring that down to **£27.00**. At the top end, Cobalt Peptides charges up to **£75.95** — a spread of about **64%** across the market. The price table and 30-day trend above show exactly where P21 is cheapest today and whether prices are moving. ## How to store P21 after delivery Most research peptides ship lyophilised (freeze-dried) and should be kept cool and dark. Once reconstituted, storage in a fridge and use within the supplier's recommended window helps preserve integrity. Always follow the handling guidance provided by your chosen vendor. ## Frequently asked questions **Is it legal to buy P21 in the UK?** Research peptides are sold for in-vitro laboratory use only. It's your responsibility to ensure any purchase complies with the law in your jurisdiction. **How quickly will P21 arrive?** Most UK suppliers dispatch within one to three working days — check each supplier's profile for their exact delivery estimate. > For in-vitro laboratory research use only. We compare suppliers — we don't sell, supply or ship P21 or any other peptide. ## Compare all P21 suppliers Choose a dosage to see live prices, cheapest first. | # | Supplier | Price | Per mg | Stock | Lab Tested | | | --- | --- | --- | --- | --- | --- | --- | | 1 | 95 Confidence [Alpha Peptides®](https://peptidesupermarket.co.uk/suppliers/alpha-peptides) Cheapest ★ 5.0 | £27.00 | £2.70 | In Stock | — | [View Deal](https://peptidesupermarket.co.uk/go/01a08d33-9db5-7138-a458-9a38859ec8df?loc=keyword_price_table) | | 2 | 90 Confidence [Cobalt Peptides](https://peptidesupermarket.co.uk/suppliers/cobalt-peptides) ★ 5.0 | £75.95 | £7.60 | Out of Stock | — | [View Deal](https://peptidesupermarket.co.uk/go/01a0cfed-c6ab-7042-ac53-b1a4a09c40f4?loc=keyword_price_table) | | 3 | 50 Confidence [Genopept](https://peptidesupermarket.co.uk/suppliers/genopept) | £27.00 | £2.70 | In Stock | — | [View Deal](https://peptidesupermarket.co.uk/go/01a0f557-d58d-7202-80d4-7103d829a28e?loc=keyword_price_table) | ## Recommended P21 suppliers Verified UK vendors we'd shortlist for P21, based on price, reviews and lab testing. [Alpha Peptides®](https://peptidesupermarket.co.uk/suppliers/alpha-peptides) Best Price 95/100 £27.00 10mg - ★ 5.0 (4 reviews) [View profile](https://peptidesupermarket.co.uk/suppliers/alpha-peptides) [View deal](https://peptidesupermarket.co.uk/go/01a08d33-9db5-7138-a458-9a38859ec8df?loc=keyword_spotlight) [Cobalt Peptides](https://peptidesupermarket.co.uk/suppliers/cobalt-peptides) Runner-up 90/100 £75.95 10mg - ★ 5.0 (19 reviews) - Trading since 2026 - 1–3 day UK delivery - Lab tested by Janoshik [View profile](https://peptidesupermarket.co.uk/suppliers/cobalt-peptides) [View deal](https://peptidesupermarket.co.uk/go/01a0cfed-c6ab-7042-ac53-b1a4a09c40f4?loc=keyword_spotlight) [Genopept](https://peptidesupermarket.co.uk/suppliers/genopept) Also worth a look 50/100 £27.00 10mg - Trading since 2026 - 1–2 day UK delivery - Lab tested by Puralytix [View profile](https://peptidesupermarket.co.uk/suppliers/genopept) [View deal](https://peptidesupermarket.co.uk/go/01a0f557-d58d-7202-80d4-7103d829a28e?loc=keyword_spotlight) ### More ways to buy P21 - [P21 full price comparison](https://peptidesupermarket.co.uk/peptide/p21) - [Best P21 Prices](https://peptidesupermarket.co.uk/best-p21-prices) - [Cheapest P21 Prices](https://peptidesupermarket.co.uk/cheapest-p21-prices) - [Buy P21 Online UK Cheap](https://peptidesupermarket.co.uk/buy-p21-online-uk-cheap) - [P21 Price Comparison](https://peptidesupermarket.co.uk/p21-price-comparison) - [P21 UK Supplier](https://peptidesupermarket.co.uk/p21-uk-supplier) - [P21 For Sale](https://peptidesupermarket.co.uk/p21-for-sale) ### Compare prices for other peptides - [Retatrutide](https://peptidesupermarket.co.uk/where-to-buy-retatrutide) - [GHK-Cu](https://peptidesupermarket.co.uk/where-to-buy-ghk-cu) - [BPC-157](https://peptidesupermarket.co.uk/where-to-buy-bpc-157) - [NAD+](https://peptidesupermarket.co.uk/where-to-buy-nad) - [Mots-C](https://peptidesupermarket.co.uk/where-to-buy-mots-c) - [Tirzepatide](https://peptidesupermarket.co.uk/where-to-buy-tirzepatide) ## Compare every P21 deal in one place Live prices from verified UK suppliers, updated continuously. 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