Every price on PeptidesGrid is converted to US dollars per milligram. The biggest surprise is usually the gap between a 10-vial kit and a single vial of the same peptide. In the site's data on Nov 9, 2026, for four widely listed peptides, the median single vial cost 4.4 to 12.4 times as much per mg as the median kit. (The median is the middle price when all prices are sorted from low to high.) Both prices are real.
Vendors sell these compounds as research chemicals, not for human use. This guide compares prices only.
What "kit" means on this site
A kit is any pack of 5 or more vials. Most are 10 vials of the same peptide at the same size, sold as one item. A single vial is a pack of 1. Packs of 2 to 4 vials are rare; they count toward a peptide's overall median but not toward the kit or single-vial medians.
Some listings don't state a vial count. When the listing says "kit", or the store sells only 10-vial kits, the site counts it as 10 vials and marks the pack size with an asterisk.
How the per-mg number works
Each listing is reduced to one figure: the listed price divided by the total milligrams in the pack (milligrams per vial times vials). That figure is converted to US dollars at the European Central Bank's reference rates. A product sold together with something else, such as bacteriostatic water or syringes, is left out. One exception is under review: AD Labs sells every vial with bacteriostatic water in one price and no vial without it, so its whole price counts, and each of its listings carries a note saying so. Two examples with round numbers:
- A kit of 10 vials at 10 mg each, listed at $100, holds 100 mg. $100 divided by 100 mg is $1.00 per mg.
- A single 10 mg vial listed at $64 holds 10 mg. $64 divided by 10 mg is $6.40 per mg.
The kit costs more at checkout but holds ten times the material, so its price per mg is far lower.
The gap in the current data
Medians on Nov 9, 2026 for four of the most listed peptides, worked out as on each peptide page. Likely listing errors are left out, and a size and pack that one store lists from several warehouses counts once, at its cheapest copy in stock. The last column is the median price of the whole pack, which is what you pay upfront.
| Peptide | Kit, $/mg | Single vial, $/mg | Single vs kit | Median price, kit / single |
|---|---|---|---|---|
| Retatrutide | $0.94 | $7.54 | 8.0x | $240 / $130.58 |
| Tirzepatide | $0.50 | $6.20 | 12.4x | $146.71 / $109.99 |
| BPC-157 | $1.07 | $6.00 | 5.6x | $81 / $46.50 |
| TB-500 | $1.60 | $7.02 | 4.4x | $115 / $52.09 |
The retatrutide medians are taken over 190 kit prices and 68 single-vial prices, one for each store, size and pack, and BPC-157's over 68 and 58. Because each peptide's overall median mixes both tiers, it can sit far from either one. BPC-157's overall median is $4.35 per mg, between its kit median of $1.07 and its single-vial median of $6.00.
Why kits cost less per mg
This market has two tiers. Factory-direct sellers mostly sell 10-vial kits. US resellers mostly sell single vials. Their prices can reflect local stock, domestic shipping, customer service and, at some stores, their own testing. The site shows both tiers. It marks a listing as a likely error when it sits far below both, or when its size or vial count looks misread, such as a bigger size priced no higher than a smaller one on the same page. Those listings are labelled "likely listing error", "size unclear" or "pack size unclear". It notes one that sits far above both as "far above other stores".
How to compare them on the site
- Open a peptide page. The first line gives the kit and single-vial medians.
- Use the pack filter to show "Single vials" or "Kits (5+ vials)" only.
- Compare the $/mg column, not the price column.
- Untick "Best per store" to see every size and pack a store sells. By default the table shows each store's cheapest matching listing.
- Tick "Lab-tested vendors only" to keep stores the site can tie to a vendor with lab tests, and "In stock only" to drop sold-out listings.
Trade-offs buyers weigh
- Upfront cost. A kit is one larger payment for ten vials. The median BPC-157 kit costs $81 against $46.50 for the median single vial. If you need only a small quantity for your research, the lower price per mg may not be the cheaper purchase.
- Shipping origin and time. For BPC-157, most single-vial listings come from stores in the US, going by their own shipping pages or, where those don't say, their Finnrick profile (listing tables mark the second kind "Based in"). Kit listings are more mixed: many come from stores in China or Hong Kong, and many from stores whose location the site couldn't confirm. The "Ships from" filter on a peptide page keeps the listings from one place. Stores in the site's data that ship from China or Hong Kong state delivery times of about 7 to 25 days on their own pages. Several also run US or Canada warehouses that quote 2 to 7 days, sometimes at a different price.
- Customs. An international parcel is cleared by customs in the destination country. Rules on importing research chemicals differ by country, and a parcel can be delayed, inspected, returned or held. Some stores quote delivery with customs clearance included, and some describe what happens if a parcel is held. Read the store's policy and your own country's rules before you order.
- Payment. Crypto and most bank transfers can't be reversed the way a card payment sometimes can. Each store page lists the payment methods its own pages showed.
- Store domain. Vendor names in this market are often used on more than one domain. On Nov 9, 2026, the site had checked 220 store domains, and 10 had a fraud warning from a named source. A vendor's lab score appears only beside prices from a store the site can tie to that vendor. See how to check a store's domain.
- Lab data. A Finnrick score describes a vendor's past samples, not a particular kit or vial. See Finnrick scores explained.
Prices change daily; each peptide page shows the current medians, and the method page explains every step.
Medians, pack prices and counts are worked out each time the site is updated, from the prices on the peptide pages (the newest read Nov 9, 2026; a listing read more than 2 days earlier shows its date there). Likely listing errors are excluded, and each store's size and pack counts once. Last reviewed Sep 27, 2026.