The price of a vial depends above all on two things: how many milligrams of substance are inside, and how hard that particular peptide is to make. On top of that come the brand, any modification of the molecule such as pegylation or a DAC complex, and the form, meaning a single peptide or a ready-made mix. A low price can also be a signal of lower purity or a smaller quantity. What is worth comparing is the cost of one milligram, not the cost of the whole vial. This article deliberately gives relationships rather than amounts, because a price copied into an article goes out of date the first time it changes; the current figure is always on the product page in the shop, quoted in Polish zloty.
How much substance is in the vial?
This is the biggest factor. A larger vial is sometimes slightly cheaper per milligram: for BPC-157, moving from a 5 mg vial to a 20 mg one lowers the cost per milligram by roughly a seventh. For other peptides the cost per milligram is flat, and sermorelin at 5 mg and at 10 mg works out the same either way. A larger vial saves money, but it means keeping the dissolved peptide longer, which works against its stability. Shelf life of a made-up solution is covered in the article on storing peptides.
Which peptide is it?
The second large factor is the peptide itself. Short, simple chains are cheap to synthesise; large proteins and molecules carrying modifications are far more expensive. It shows up clearly once you compare cost per milligram, with BPC-157 taken as the reference point.
| Peptide | Vial | Cost per mg relative to BPC-157 |
|---|---|---|
| Mod GRF 1-29 | 10 mg | about 0.9 times |
| BPC-157 | 5 mg | 1 (reference) |
| Ipamorelin | 10 mg | about 1.1 times |
| MOTS-c | 10 mg | about 1.1 times |
| Retatrutide | 20 mg | about 2.7 times |
| Follistatin 344 | 1 mg | about 11 times |
| IGF-1 LR3 | 1 mg | about 17 times |
BPC-157 has 15 amino acids and Mod GRF 1-29 has 29, and both land in the same bracket. Follistatin 344 runs to 344 amino acids and IGF-1 LR3 is an 83 amino acid protein analogue, so their synthesis is far harder and a milligram costs an order of magnitude more.
Modification of the molecule
Attaching an extra chemical group to a peptide raises the cost of making it. CJC-1295 with a DAC complex costs about a fifth more than plain CJC-1295 in the same vial size, and pegylated PEG-MGF about a quarter more than plain MGF. A modification that extends the peptide’s action adds roughly 20 to 25 per cent for the same content.
Brand
The same peptide in the same quantity costs differently across brands. For TB-500 at 10 mg the spread between the cheapest and the dearest brand is about a third; a similar pattern holds for Mod GRF 1-29 and ipamorelin. That difference is not evidence of a difference in purity. What separates the three brands apart from price is explained in the article on Bio-Peptide, Genheal and Nouveaux Ltd, and how to judge quality independently of price in the article on recognising fake peptides.
Form: single peptide or mix
A ready-made mix tends to cost less than buying the components separately. A vial of BPC-157 with TB-500 in a single 10 mg mix comes out clearly below the combined price of a BPC-157 vial and a TB-500 vial bought on their own. The mix is cheaper, but it does not let you dose the two peptides independently of each other. Why the two are combined at all is explained in a separate article on the BPC-157 and TB-500 combination.
What price does not guarantee
Price says nothing certain about purity. It tells you about vial size and about how hard the molecule is to synthesise, not about what is actually inside. In independent analyses of grey-market products, contamination or mislabelling affects about 30 per cent of samples. A peptide priced clearly below the rest of the market is a warning sign, not a bargain. Purity is shown by a certificate of analysis from an independent laboratory.
Frequently asked questions
What determines the price of a peptide most?
The amount of substance in the vial in milligrams, and how hard the peptide is to synthesise. Short peptides sit at the bottom of the range, while large proteins such as follistatin 344 or IGF-1 LR3 cost an order of magnitude more per milligram.
Is a larger vial worth it?
Usually the cost per milligram is lower or the same. The drawback is keeping the dissolved peptide longer, which works against its stability.
Why does the same peptide cost differently across brands?
Brands price themselves differently, typically within a third of one another for the same quantity. The price difference is not evidence of a difference in purity.
Is the cheapest offer a good choice?
Not always. A price clearly below the rest of the market can signal lower purity or a smaller quantity. Quality is shown by a certificate of analysis, not by price.
Where this information comes from
All the price relationships in this article were calculated from the shop’s own catalogue prices read on 8 September 2026. They are given as ratios rather than amounts on purpose, so that the article does not go out of date with the next price change; the current amount is always on the product page. The amino acid counts for BPC-157, Mod GRF 1-29, follistatin 344 and IGF-1 LR3 come from the published sequences of those molecules. The figure of about 30 per cent of grey-market samples with contamination or mislabelling comes from published independent analyses.