--- title: "Best P21 Prices UK 2026 | Compare 3 Suppliers - PeptideSupermarket®" description: "Find the best P21 prices in the UK. Compare 3 verified suppliers from £27.00. Alpha Peptides® is cheapest today — average £43.32." url: "https://peptidesupermarket.co.uk/best-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) › Best P21 Prices in the UK # Best P21 Prices in the UK Hunting for the best deal on **P21**? We track live prices across 3 verified UK suppliers so you can buy from **£27.00** without trawling a dozen websites. Cheapest right now: **Alpha Peptides®** at £27.00 Cheapest Price £27.00 at Alpha Peptides® Average Price £43.32 10mg dosage Highest Price £75.95 at Cobalt Peptides UK Suppliers 3 compared ## P21 Price Comparison Pick a dosage to compare live prices across UK suppliers. | # | 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) | ### 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 ## Top P21 suppliers Our pick of the best-value verified UK vendors stocking P21 right now. [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) ## What's the best price for P21? Right now the best P21 price is **£27.00** from [Alpha Peptides®](https://peptidesupermarket.co.uk/suppliers/alpha-peptides), based on the 10mg dosage. Across all 3 suppliers we track, the average sits at **£43.32**, while the most expensive listing comes from Cobalt Peptides. That's a spread of roughly **64%** between the cheapest and dearest — so choosing the right vendor can make a real difference to what you pay. Because we normalise every listing to the same 10mg dosage, the prices above are directly comparable. The cheapest option currently works out at around £2.70/mg, which is the figure worth anchoring on when you weigh up vials of different sizes. ## How we track P21 prices We continuously monitor P21 listings from 3 verified UK suppliers, recording every price change as it happens. Each price is converted to a per-milligram figure for the 10mg dosage so you're always comparing like for like, never headline numbers that hide a smaller vial. The comparison table updates automatically, and the 30-day chart above shows whether P21 is trending cheaper or more expensive — handy for deciding whether to buy now or wait. ## Is the cheapest P21 always the best buy? Not always. The lowest sticker price doesn't guarantee the lowest cost per milligram, and a vendor without third-party lab testing may not be the bargain it appears. When we rank value we look beyond price alone at: - **Purity and lab testing** — independent certificates of analysis confirming concentration and identity. - **Stock status** — an unbeatable price is no use if the product is out of stock. - **Delivery speed and cost** — free-shipping thresholds can flip which supplier is genuinely cheapest once postage is added. - **Reputation** — established vendors with verified reviews carry less risk. ## Tips for getting the best P21 price - **Compare the per-mg cost**, not just the headline price — larger 10mg vials are often better value than several small ones. - **Use discount codes** — some suppliers offer an extra percentage off at checkout, which can beat a lower sticker price elsewhere. - **Buy when the trend dips** — the 30-day chart shows the cheapest, average and highest price each day so you can time your order. - **Check the total cost** — factor in shipping and any free-delivery threshold before deciding. ## How much should you pay for P21? As a rule of thumb, expect to pay around **£43.32** for the 10mg dosage, with the keenest UK pricing starting at **£27.00**. Anything close to **£75.95** is at the top of the current range — worth it only if it buys you faster delivery, a stronger guarantee, or verified testing you can't get cheaper elsewhere. > All peptides listed are for in-vitro laboratory research only. Peptide Supermarket is a price-comparison service and does not sell, supply, or ship any products. ### More ways to buy P21 - [P21 full price comparison](https://peptidesupermarket.co.uk/peptide/p21) - [Cheapest P21 Prices](https://peptidesupermarket.co.uk/cheapest-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/best-retatrutide-prices) - [GHK-Cu](https://peptidesupermarket.co.uk/best-ghk-cu-prices) - [BPC-157](https://peptidesupermarket.co.uk/best-bpc-157-prices) - [NAD+](https://peptidesupermarket.co.uk/best-nad-prices) - [Mots-C](https://peptidesupermarket.co.uk/best-mots-c-prices) - [Tirzepatide](https://peptidesupermarket.co.uk/best-tirzepatide-prices) ## Compare every P21 deal in one place Live prices from verified UK suppliers, updated continuously. 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