--- title: "Cheapest P21 UK — From £27.00 (October 2026) - PeptideSupermarket®" description: "The cheapest P21 in the UK right now is £27.00 at Alpha Peptides® . Compare 3 suppliers side by side and save up to 64%." url: "https://peptidesupermarket.co.uk/cheapest-p21-prices" 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) › Cheapest P21 in the UK # Cheapest P21 in the UK The cheapest **P21** today is **£27.00** at Alpha Peptides® . Compare every UK supplier below and save up to **64%** versus the most expensive listing. From £27.00 3 UK suppliers compared | # | 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) | Prices updated continuously across all dosages. We may earn a commission from links. 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 ## Where to buy P21 cheapest The verified UK suppliers offering the best P21 value today. [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) ## Where to find the cheapest P21 [Alpha Peptides®](https://peptidesupermarket.co.uk/suppliers/alpha-peptides) currently has the cheapest P21 at **£27.00** for the 10mg dosage — that's about £2.70/mg. With 3 UK suppliers in our index and an average price of **£43.32**, the gap between the best and worst deal is roughly **64%**, so it genuinely pays to shop around rather than buy from the first vendor you find. ## How much cheaper is the best deal? The cheapest P21 listing (£27.00) sits well below the average of £43.32, and the most expensive vendor, Cobalt Peptides, charges up to £75.95. Buying from the cheapest verified supplier rather than the dearest could save you the better part of **64%** on every vial — money better spent on more product or proper storage. ## Is the cheapest P21 always the best buy? Not necessarily. The lowest sticker price doesn't always mean the lowest cost per milligram, and an unverified supplier may skip third-party lab testing to keep prices down. Before you check out, weigh the headline price against: - **Cost per mg** for the 10mg dosage, not just the price of the vial. - **Lab testing** — a certificate of analysis confirming purity and concentration. - **Stock and delivery** — in-stock items with fast, affordable UK shipping. - **Discount codes** — an extra percentage off at checkout can make a mid-priced vendor the cheapest overall. ## Track P21 prices over time Our 30-day trend chart shows the cheapest, average and highest P21 prices day by day, so you can spot whether prices are rising or falling before you commit. If the cheapest line is trending down, it can pay to wait; if it's climbing, locking in today's £27.00 may be the smarter move. ## Frequently asked questions **Who sells the cheapest P21 in the UK?** Right now it's Alpha Peptides® at £27.00, though our table updates continuously as suppliers change their pricing. **Why are some P21 prices so much higher?** Larger dosages, branded packaging, faster shipping and independent lab testing all push prices up. Always compare the per-mg cost to see past the headline figure. > For in-vitro laboratory research use only. We compare suppliers — we don't sell P21 or any other peptide. ### 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) - [Where to Buy P21](https://peptidesupermarket.co.uk/where-to-buy-p21) - [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/cheapest-retatrutide-prices) - [GHK-Cu](https://peptidesupermarket.co.uk/cheapest-ghk-cu-prices) - [BPC-157](https://peptidesupermarket.co.uk/cheapest-bpc-157-prices) - [NAD+](https://peptidesupermarket.co.uk/cheapest-nad-prices) - [Mots-C](https://peptidesupermarket.co.uk/cheapest-mots-c-prices) - [Tirzepatide](https://peptidesupermarket.co.uk/cheapest-tirzepatide-prices) ## Compare every P21 deal in one place Live prices from verified UK suppliers, updated continuously. 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