Peptide prices explained

Suppliers sell the same peptide in different vial sizes: 2 mg, 5 mg, 10 mg, sometimes 20 mg or more. Comparing the sticker price of one supplier’s 5 mg vial with another’s 10 mg vial tells you nothing. The fair comparison is price per mg: the vial price divided by the milligrams on the label.

For example, a 5 mg vial at £30 is £6 per mg, and a 10 mg vial at £50 is £5 per mg. The larger vial is cheaper per mg even though it costs more up front. That is the figure PepFinder uses on every price comparison page and on each supplier’s catalogue.

Use the same arithmetic for multi-vial kits and bundles: divide the total price by the total milligrams across all the vials, and compare that. Kits are often, but not always, cheaper per mg than single vials, and some bundles include accessories whose value is hard to judge.

Bigger vials are usually cheaper per mg, but not always better value: a larger vial takes longer to use, and once reconstituted it has a limited life in the fridge (see how to store peptides).

A supplier pricing in pounds and one pricing in US dollars are not directly comparable, even after converting at today’s exchange rate. Prices are set for different markets, with different shipping costs, taxes and competition, and exchange rates move every day. Converting everything into one currency produces an average that no buyer actually pays.

So PepFinder compares each price only with other prices in the same currency. When a profile says a supplier is “20% cheaper than average per mg”, the average is built from suppliers pricing the same peptide in the same currency. Pick where you are based with the region selector, or browse by country: UK, US, Canada, Australia and New Zealand.

• Shipping. Flat-rate shipping makes small orders expensive. Some suppliers ship free above a threshold. International shipping can cost more than the peptide.
• Payment surcharges and discounts. Some suppliers add a fee for card payments, or discount payment by crypto or bank transfer. A discount for an irreversible payment method is also a transfer of risk to you; our guide on spotting unreliable suppliers explains why.
• Import duties and taxes on international orders, depending on where you live.
• Accessories. Bacteriostatic water, sold separately by most suppliers. See bacteriostatic water.
• Failed orders. An order that never arrives costs 100% of its price. A supplier’s reliability is part of its value, which is why reliability carries the largest weight in the PepFinder rating.

Price per mg assumes the vial contains the amount on the label, and that it is the peptide named. Neither is guaranteed.

• Net peptide content. Freeze-dried peptide powder includes water and counter-ions. A “10 mg” vial may hold 10 mg of powder, of which perhaps 70–90% is peptide. Our guide on reading a COA explains how to tell.
• Under-filling. Independent tests sometimes find vials holding noticeably less than labelled. A vial with 20% less peptide is effectively 25% more expensive per mg than it looks.
• Purity and identity. A cheaper vial of a less pure or mislabelled product is not a saving.

This is where testing and price meet. A supplier with batch-matched, independent quantity tests gives you a price per mg you can believe. See the third-party tested suppliers.

Synthesis, purification, testing and shipping all cost money, and there is a floor below which honest suppliers cannot go. A price far below everyone else’s is more likely to signal a problem than a bargain. That is why PepFinder’s best value ranking caps the pricing score: being much cheaper than the market earns a good score, but never a perfect one, and value is judged with delivery, reliability and reviews in mind.

A useful rule: compare price per mg in your currency, then pick among the suppliers that are reasonably priced, not necessarily the very cheapest, using testing, delivery and reviews to decide. The best-rated ranking combines all of those, and the comparison tool puts two suppliers side by side.

Research peptide prices move more than most people expect. Suppliers run sales, change vial sizes, restock from new batches at new costs, and reprice when competitors do. A supplier whose prices drop sharply and repeatedly just before going quiet is a pattern worth knowing about (see spotting unreliable suppliers).

That is why every catalogue item on a PepFinder profile keeps its price history. A price that has been stable for months is easier to trust than one that appeared last week at half the market rate. When you compare suppliers on the price comparison pages, look at when each price was last checked as well as the figure itself.

We read the prices suppliers publish on their own websites, in the currency they are listed in, and record each change so every catalogue item has a price history. We do not take payment for prices or placement, and a supplier cannot change its own listed prices on PepFinder: they come from its public website. Prices can change after we last checked, so each listing shows when it was last read, and the supplier’s own site is always the final word.