Semax Price: The Testing That Sits Behind $30 a Vial

The Semax price at the supplier linked below is $59.99 for a 10 mg vial and $30.00 once the checkout code is applied, which is $6.00 and $3.00 per labelled milligram. There is a single presentation, so no vial-size comparison exists to run.

That is the whole of the arithmetic, and it takes one line. The more interesting question is what was measured on the material before any figure was attached to it, because analyses cost money to run and the cheapest way to lower a price is to run fewer of them. The batch behind this listing carries six results across four instruments, and that is a rarer thing in this market than a low headline number.

The listing the figures below are taken from:

What the Semax price is at each quantity

The published quantity tiers apply to the list price, not to the discounted one: 3 percent off at three vials, 5 percent at five, 10 percent at ten. The table exists mainly so the final row has something to be compared against.

The last row is a different kind of saving from the four above it. Ten vials at the 10 percent tier remove $60.00 from a $600 basket; the code removes $29.99 from a single $59.99 order. Whether the code applies to more than one vial in a basket, and whether it combines with a tier, is not stated in the published terms, so this page does not claim that it does. Build the basket, enter the code, read the order summary before paying. Carriage is free above $250, which five vials at the tier price clears and three do not.

Six results, four instruments, one batch

The supplier publishes a four-page certificate for batch 30-05260628, certified 15 June 2026 by Kovera Labs under report number KVR-2026-E848E0. Read as a bill of work rather than a marketing document, it contains six results produced on four different instruments, and each one closes a different question.

• Purity 99.886 percent against a stated specification above 98 percent, by reversed-phase chromatography on a C18 column with diode-array detection at 214 nm. That wavelength sees the peptide bond itself, so what the figure grades is the proportion of ultraviolet-absorbing material eluting under the main peak. It is the measurement that speaks to peptide-related impurities: truncated, deleted and modified sequences from synthesis, which elute at their own retention times and show up as separate peaks.
• Identity confirmed by liquid chromatography with mass spectrometry. Purity and identity are not the same claim, and this is the one that matters more. A vial of the wrong compound, cleanly made, passes a purity test without difficulty.
• Net content 11.23 mg against a specification written as approximately 10 mg. Most sellers in this market never weigh what is in the vial at all.
• Bacterial endotoxin below 0.20 EU/mL against an acceptance limit of 0.5 EU/mL, by kinetic chromogenic LAL assay to USP Chapter 85, run against an E. coli O111:B4 standard over a 0.01 to 1.0 EU/mL detection range across a 2.0 mL dilution volume, which is below 0.40 EU in total for the vial, so the concentration reached depends on how much fluid it is reconstituted in. Endotoxin is a heat stable fragment of gram-negative bacterial cell wall. It is not killed by sterilisation and it is not visible in a chromatogram, which is why FDA treats pyrogen testing as its own discipline with its own questions and answers.
• Rapid sterility screen: no growth. Reconstituted material incubated in growth media for two days at 30 to 35 degrees Celsius, with no bacterial growth and no fungi or yeast detected. The report is candid about its own scope, noting that full compendial sterility testing under USP Chapter 71 may be required for regulatory purposes, which is a qualification most vendor documents would quietly leave out.
• Elemental impurities by inductively coupled plasma mass spectrometry. Lead, arsenic, cadmium and mercury each below their stated acceptance limits, with spike recoveries between 91 and 102 percent reported alongside the results. The recoveries are the part worth noticing: they are the check that the method worked in this sample matrix rather than only in a standard.

Four of those six are the tests a certificate in this market usually has. The last three on the list are the ones it usually does not, and they are separate jobs with separate costs. The comparison is available without leaving the same seller, and it runs by date rather than by product: this vendor’s February certificates run to two pages with no endotoxin assay, no sterility screen and no metals panel, while its June batches carry all three on both compounds, the Selank batch 29-05260628 included. We set the arithmetic out line by line in our reading of what a Selank milligram costs. Same storefront, same price bracket, and the extra laboratory time is bought by the batch, not by the higher-priced product.

The division the label supports, and the one the report supports

Every per-milligram figure in the table divides by the number printed on the label. The certificate reports a different number. At the discounted $30.00, the price per labelled milligram is $3.00 and the price per measured milligram on that batch is $2.67. At list, $6.00 becomes $5.34.

The second figure is the more honest one and the less transferable one. A fill weight is an outcome of one filling run, not a promise, and the specification the laboratory graded it against is approximate by design. Ask for the certificate bearing the batch number printed on the vial you were actually sent, and read the net content line on that document rather than this one. The same reasoning, applied where the mass is weighed instead of assayed, is worked through in our analysis of a weighed rather than assayed milligram.

What the money does not settle

A price is chosen after the fact. Identity, purity, quantity, endotoxin load and metals are measurements made on material before any figure was attached to it, and a measurement is only as good as the procedure behind it, which is the principle ICH Q2(R2) sets out for regulated analytical work. Research-supply certificates carry no such obligation, so a named laboratory, a report number, a batch number, a stated method and a visible chromatographic trace are worth more than a large percentage in a large font.

What no amount of testing buys is a settled case for the compound. This is a synthetic seven-residue peptide, PubChem CID 9811102, formula C37H51N9O10S, molecular weight 813.9: the ACTH(4-7) fragment Met-Glu-His-Phe carrying a Pro-Gly-Pro tail that slows enzymatic breakdown. The published mechanistic literature is largely preclinical work in rodents. It holds a Russian registration, which is a fact about another regulatory system rather than evidence by Western standards, and it has no FDA marketing authorisation for any indication. FDA's own concern is immunogenicity arising from aggregation and peptide-related impurities, and the agency states it lacks sufficient information to know whether the drug would cause harm in humans. Its nomination for the compounding bulks list was withdrawn, and it appears in none of the three categories of the list updated on 14 May 2026.

Nothing here describes or implies human use, and there are no quantities on this page because quantity is not a price question. For how this site grades material sold under research-use terms generally, see what research-use supply actually means.