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 Sep 25, 2026 data for four widely listed peptides, the median single vial cost about 5 to 8.5 times as much per mg as the median kit. 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 a store sells the product as a kit, or 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 milligrams per vial times vials in the pack, converted to US dollars at European Central Bank rates. 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 Sep 25, 2026 data
Medians for four of the most listed peptides. The last column is the median price of the whole pack, which is what you pay upfront. Likely listing errors are left out.
| Peptide | Kit, $/mg | Single vial, $/mg | Single vs kit | Median price, kit / single |
|---|---|---|---|---|
| Retatrutide | $0.96 | $7.83 | 8.2x | $235 / $160 |
| Tirzepatide | $0.56 | $4.75 | 8.5x | $155 / $128 |
| BPC-157 | $1.00 | $6.40 | 6.4x | $84 / $50 |
| TB-500 | $1.85 | $8.99 | 4.9x | $132.50 / $65 |
Kits outnumber single vials for these peptides. Retatrutide had 227 kit listings and 78 single-vial listings; BPC-157 had 72 and 59. Because each peptide's overall median mixes both tiers, it can sit far from either one: BPC-157's overall median was $3.60 per mg, between its kit median of $1.00 and its single-vial median of $6.40.
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, and their price covers local stock, domestic shipping, customer service and, at some stores, their own testing. The site shows both tiers and marks a listing as a likely error only when it sits far outside both.
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 "Finnrick-listed only" to keep stores on a domain Finnrick lists for the vendor, 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 was $84 against $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, 44 of the 59 single-vial listings came from stores that ship from the US. Kit listings were more mixed: 27 of 72 from US shippers, 16 from China, and 23 from stores whose shipping origin the site couldn't confirm. 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 verification. Vendor names in this market are often used on more than one domain. On Sep 25, 2026, 24 of the 185 domains the site checks were not Finnrick-listed, and only a Finnrick-listed domain gets the vendor's lab score. 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.
Figures are from the site's Sep 25, 2026 build: medians of listed prices, likely listing errors excluded. Last reviewed Sep 25, 2026.