Comparing research peptide prices by looking at the number on the product page is close to useless, because the number describes a vial and vials are not the same size. A $59 vial and a $79 vial can contain 10 mg and 50 mg respectively, which makes the more expensive one roughly four times cheaper per milligram. Normalising to cost per milligram takes a few seconds and changes the ranking more often than not. It also has limits worth understanding, because the metric is easy to misuse across compounds where it means nothing at all.
Quick answer
How do you compare research peptide prices? Divide the vial price by the milligrams in the vial to get cost per milligram, and only compare that figure between vials of the same compound. A 50 mg vial at $79 is $1.58/mg, while a 10 mg vial at $59 is $5.90/mg. Then adjust for three things the headline price hides: net peptide content, which determines how much of the powder is actually peptide; whether the lot has independent documentation; and shipping. Cost per milligram across different compounds is not a meaningful comparison.
The calculation
Cost per milligram is the vial price divided by the milligrams it contains. For a multi-component blend, divide by the total peptide mass across components, since that is what the vial supplies.
| Example | Price | Mass | Cost per mg |
|---|---|---|---|
| Single vial | $59 | 10 mg | $5.90/mg |
| Larger vial | $89 | 100 mg | $0.89/mg |
| Two-component blend | $69 | 5 mg + 5 mg = 10 mg | $6.90/mg |
The arithmetic is trivial. The reason it is worth doing is that vial sizes in this market are not standardised, so the price column on a category page ranks vials rather than value.
Worked from a real catalog
Rather than illustrate with invented figures, here is the Revoryn Labs catalog normalised. Single-vial prices, and the ten-vial packs where they exist.
| Compound | Vial | Single price | Cost per mg | 10-vial pack | Pack cost per mg |
|---|---|---|---|---|---|
| Epitalon | 100 mg | $89 | $0.89 | n/a | n/a |
| GHK-Cu | 50 mg | $79 | $1.58 | $632 | $1.26 |
| KLOW Blend | 80 mg | $219 | $2.74 | $1,752 | $2.19 |
| BPC-157 | 10 mg | $59 | $5.90 | $472 | $4.72 |
| BPC-157 / TB-500 | 5 + 5 mg | $69 | $6.90 | $552 | $5.52 |
| MT-2 | 10 mg | $69 | $6.90 | n/a | n/a |
| PT-141 | 10 mg | $79 | $7.90 | n/a | n/a |
| TZ | 20 mg | $189 | $9.45 | n/a | n/a |
| SM | 10 mg | $129 | $12.90 | n/a | n/a |
| MOTS-c | 10 mg | $139 | $13.90 | n/a | n/a |
| RT | 10 mg | $149 | $14.90 | $1,192 | $11.92 |
Prices are current at publication and may change; the product pages are authoritative. The full range is in the complete catalog, and the multi-vial options are in the wholesale collection.
The mistake this table invites
Read down the cost-per-mg column and Epitalon looks seventeen times better value than RT. That comparison is meaningless. These are different molecules with different molecular weights, different synthesis difficulty, different quantities used in an experiment, and entirely different research questions. Cost per milligram compares like with like, which in practice means the same compound at the same vial size between suppliers, or the same compound across vial sizes from one supplier.
The molecular weight point is worth making concrete: a milligram is not a fixed number of molecules, and a small peptide delivers far more of them per milligram than a large one. That conversion is worked through in peptide molarity.
The correct question is never which peptide is cheapest per mg. It is: given the compound this experiment requires, what does a milligram of it cost, and from whom. Choosing the compound comes first, and it comes from the research question; see a research buyer guide to the catalog.
Three corrections the headline price hides
1. Net peptide content
A vial labelled 10 mg contains 10 mg of lyophilized material, of which a portion is counter-ion, residual water and residual solvent. Net peptide content is typically in the 70 to 90 percent range for a trifluoroacetate salt. Two vendors selling a 10 mg vial at the same price are not selling the same amount of peptide if one reports 88 percent net peptide content and the other reports 74 percent, or does not report it at all.
The correction is direct: divide the vial price by the label mass multiplied by net peptide content. At $59 for 10 mg, a lot at 88 percent works out to $6.70 per mg of actual peptide, and one at 74 percent to $7.97. That is a 19 percent difference invisible on the product page. See net peptide content vs purity.
2. Documentation
An undocumented lot is not a cheaper version of a documented one. It is a different thing: material whose purity and identity are unverified, bought on the assumption that it matches its label. If the assumption fails, the cost is not the price of the vial but the cost of the work done with it, which is usually the larger number. Lot-level certificates are the control that makes the comparison legitimate; see why batch-specific testing matters and how to evaluate a research peptide supplier.
3. Shipping and order thresholds
Shipping can dominate the comparison on a small order and vanish on a large one. A $10 difference in vial price disappears against a $25 shipping charge, and free-shipping thresholds change the arithmetic again. Revoryn Labs ships US orders over $100 free with tracking, which means the comparison worth running is landed cost per milligram on the order you actually intend to place, not list price per vial.
When buying in bulk genuinely saves money
Multi-vial packs in this market typically discount 15 to 30 percent; the Revoryn ten-vial packs are priced 20 percent below single-vial rates, which moves BPC-157 from $5.90 to $4.72 per milligram. That is a real saving, and it is only a saving under two conditions.
| Bulk makes sense when | Bulk costs money when |
|---|---|
| The study is defined and the quantity is known | The quantity is a guess and the surplus is never used |
| Material will be consumed within its documented stability window | Vials sit past their retest date and have to be re-evaluated or discarded |
| Lot consistency across the whole study is an advantage | The protocol may change and a different compound will be needed |
| Storage at the required temperature is available | Storage capacity is the constraint |
The lot-consistency point is underrated. Ten vials from one lot remove batch-to-batch variation as a variable across an entire study, which is worth something independent of the discount. How long that material stays usable is covered in how long lyophilized peptides last and peptide storage temperature.
A comparison worth running once
- Fix the compound and the vial size you need.
- Divide each vendor price by the milligrams to get cost per milligram.
- Find each vendor net peptide content for a real lot and correct the figure. If it is not published, note that as a finding.
- Confirm each has a lot-specific certificate from a named independent laboratory.
- Add shipping for the order size you will actually place.
- Compare the corrected landed figures, and only then look at multi-vial pricing.
Vendors that fail step four do not belong in the comparison at all, regardless of where they land on price. How to evaluate a research peptide supplier covers that screen in detail, and available Revoryn lot documentation is published in the public COA ledger.
Key takeaways
- Divide price by milligrams. Vial sizes are not standardised, so headline price ranks vials, not value.
- Only compare cost per milligram within the same compound. Across compounds the metric is meaningless.
- Net peptide content can shift the real cost per milligram by 15 to 20 percent and is invisible on a product page.
- An undocumented lot is not a cheaper lot; the risk moves to the cost of the work, not the vial.
- Compare landed cost, including shipping, for the order you intend to place.
- Bulk pricing of 15 to 30 percent only saves money if the material is consumed within its stability window.
Frequently asked questions
How do you calculate cost per milligram for a peptide?
Divide the vial price by the milligrams in the vial. A $79 vial containing 50 mg is $1.58 per milligram. For a blend, divide by the total peptide mass across all components.
Why are some research peptides so much more expensive per milligram?
Synthesis difficulty scales with sequence length and complexity, and purification yield varies widely between molecules. A short tetrapeptide and a long multi-agonist peptide are not comparable manufacturing problems, which is why their prices per milligram differ by an order of magnitude.
Is buying peptides in bulk cheaper?
Per milligram, usually yes; multi-vial packs in this market commonly discount 15 to 30 percent. It is only a saving if the material is used within its documented stability window and stored correctly.
Does a lower price mean lower quality?
Not necessarily, and the inference does not run in either direction. Price reflects synthesis cost, scale and margin. Quality is established by lot-specific analytical documentation, which is the thing to check rather than the price tag.
Should I compare cost per milligram between different peptides?
No. Different compounds have different molecular weights, synthesis routes and experimental uses. The metric is only informative within one compound, across suppliers or vial sizes.
Sources
- D Hondt M, Bracke N, Taevernier L, et al. Related impurities in peptide medicines. J Pharm Biomed Anal. 2014;101:2-30. doi:10.1016/j.jpba.2014.06.012
- Bachem. Quality Control of Amino Acids & Peptides: A Guide. bachem.com
- Revoryn Labs product pricing, current at publication. Full catalog and wholesale collection.
For laboratory and in-vitro research use only. Not for human or veterinary use.
For laboratory and in-vitro research use only. Not for human or veterinary use. See our research-use disclaimer.
