How to Read a Peptide Price Table
A guide to reading a peptide price table: what per-vial and per-mg figures mean, how concentration changes the math, and what revision dates signal.
Reviewed by Benjamin Clark, MD, internal medicine physician ·
Benjamin Clark, MD is a board-certified internal medicine physician with clinical and academic training in evidence-based pharmacotherapy at Vanderbilt University Medical Center.
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A peptide price table lists the same catalogue of research compounds side by side, usually with a price per vial, a price per milligram, and a date the row was last checked. Knowing how to read a peptide price table means understanding what each column actually measures, because the two most common figures — per-vial and per-mg — answer different questions and are not directly comparable without doing a small conversion first.
What Each Column Actually Represents
A vial price is the amount charged for one sealed unit as sold, regardless of how much lyophilized peptide is inside. A 5 mg vial and a 10 mg vial from the same listing can carry very different vial prices even though both are “one vial.” That’s why a price table that only shows vial cost can be misleading when comparing two listings of the same compound at different vial sizes.
The per-mg figure normalizes for that. It’s calculated as:
per-mg price = vial price ÷ vial size in mg
This is the number that actually lets you compare a 5 mg vial against a 10 mg vial of the same peptide, or compare one compound against another on a cost basis. A well-built peptide price table will show both columns, because the vial price tells you the upfront cost and the per-mg price tells you the underlying rate.
Worked Example: Comparing Two Vial Sizes
Suppose a listing shows two options for the same compound:
| Vial size | Vial price | Per-mg price |
|---|---|---|
| 5 mg | $85 | $85 ÷ 5 = $17.00/mg |
| 10 mg | $150 | $150 ÷ 10 = $15.00/mg |
Reading only the vial price column, the 5 mg vial looks cheaper because $85 is less than $150. But the per-mg column shows the 10 mg vial carries a lower underlying rate per milligram. Neither number is “wrong” — they answer different questions. The vial price answers “what do I pay today,” and the per-mg price answers “what is the rate for the material itself.”
Why Concentration Is a Separate Number From Price
Once a vial is reconstituted with bacteriostatic water, the peptide amount doesn’t change, but the concentration in the resulting solution does, and that concentration is not something a price table reports — it’s a separate calculation a reader does afterward. Concentration is calculated as:
concentration (mg/mL) = vial mg ÷ mL of bacteriostatic water added
For example, a 5 mg vial reconstituted with 2 mL of bacteriostatic water yields a concentration of 5 ÷ 2 = 2.5 mg/mL. Add more diluent and the concentration drops; add less and it rises. This figure has nothing to do with the vial’s purchase price — it only depends on how much liquid is added — so it should never be confused with the per-mg cost figure sitting in the price table. Some readers cross-check this kind of conversion against an independent calculator, such as the one at peptcalc.com, before relying on it.
Reading the Revision Date Column
Research peptide pricing shifts frequently as suppliers adjust listings, run promotions, or change vial sizes. A price table that includes a “last checked” or “revised” date is telling you how current the figures are, not how accurate they were at the time. A row dated several months back may no longer reflect what a given listing currently shows, even if the compound name and vial size are unchanged. Treat the revision date as a freshness indicator, and treat any individual figure as a snapshot rather than a guarantee.
Cross-Compound Comparisons
When a price table spans multiple compounds rather than multiple vial sizes of one compound, the per-mg column becomes the more useful axis, since vial sizes and packaging conventions vary widely across a catalogue. A table that aggregates listings the way heezresearch.com/ does gives a single point of reference for comparing per-mg rates across an entire catalogue rather than checking each supplier’s page individually. Even then, per-mg price is only one variable — it doesn’t capture shipping cost, minimum order sizes, or how a given listing packages multiple vials together, all of which affect the total paid.
Common Misreadings to Avoid
A few patterns account for most misreadings of a peptide price table:
- Comparing vial prices across different vial sizes without converting to per-mg first.
- Treating concentration (mg/mL after reconstitution) as if it were listed in the price table, when it’s a separate calculation done afterward.
- Assuming an old revision date still reflects current pricing.
- Reading a low per-mg price as automatically the better deal without checking vial size, since a very small vial can carry a low per-mg rate but require buying several vials to reach a usable total quantity.
Cross-referencing a single listing against sibling catalogues, such as tables across peer research-peptide catalogs, can help confirm whether a given price and vial size combination is typical for that compound or an outlier.
Summary
A peptide price table works as a comparison tool once the columns are read for what they measure: vial price as the unit cost, per-mg price as the normalized rate, concentration as a separate post-reconstitution calculation, and the revision date as a freshness marker rather than a guarantee. Reading all four together, rather than any single column in isolation, is what makes a price table useful for comparing listings rather than misleading.