Buy Selank Nasal Spray: 10 mg Dry vs a Prefilled mg/mL

The formats differ in more than convenience, and the differences are what the price per milligram has to be read against.

The reason the consumer market runs on sprays is that intranasal is the route Selank was studied and registered for in Russia, so the format arrived with the compound. The reason the research market runs on vials is that a dry powder ships and stores better and lets a laboratory choose its own concentration. Neither format is more legitimate than the other. They are simply priced in incompatible units until someone does the conversion.

A percentage on a solution label is grams per 100 mL. That single sentence does all the work, because it means a 1 percent solution is 10 mg/mL and everything else scales linearly.

Once you have total milligrams, the comparison is the same one this site runs on every listing: divide the bottle price by the total milligrams and you have a figure that sits next to $2.38 per milligram without further translation. A 5 mL bottle at 0.1 percent holds 5 mg, so a $60 bottle is $12.00 per milligram. A 10 mL bottle at 0.3 percent holds 30 mg, so the same $60 is $2.00 per milligram. Same money, six times apart, and the label difference is two characters.

The second conversion is micrograms per actuation, which only works if the label states the metered volume. A pump delivers a fixed volume each time it is pressed, and that volume multiplied by the concentration is the mass delivered.

If a spray listing states neither a percentage nor a mg/mL nor a mass per actuation, there is no arithmetic to do and no way to price it. That is the disqualifying omission for this format, in the same way that a missing lot number is the disqualifying omission for a vial.

The vial side of the comparison is short. Ascension lists Selank 10 mg at $47.50, which is $23.75 with the code, so the labelled rate is $4.75 and $2.38 per milligram respectively.

The certificate then complicates it in the reader's favour. MZ Biolabs analysed lot 29-01260229 on 7 February 2026 and measured 12.29 mg in the vial rather than 10 mg, alongside purity of 99.32% by HPLC-UV and an identity confirmation by mass spectrometry against the expected monoisotopic mass of 751.43 Da. On that lot the real figure was $1.93 per milligram, about 19 percent better than the label implies. It is a lot specific measurement rather than a guarantee, and the next fill is a separate number, but it is published and checkable, which is more than most listings in either format manage. The full working is on our Selank price breakdown.

What the vial price does not include is the water, the container the solution ends up in, and the volume decision. A 10 mg vial made up to 2 mL is 5 mg/mL, which is 0.5 percent in the notation a spray label would use, and considerably more concentrated than the strengths in the table above. Made up to 10 mL it is 1 mg/mL, or 0.1 percent. Our Selank reference page works the same vial at 3 mL, which is 3.33 mg/mL. None of those volumes are recommendations, and this page does not tell you what to do with them.

This is where the two formats stop being a pricing question. FDA's stated concern about this compound is route dependent, and the phrase it uses is worth reading closely: compounded drugs containing selank acetate "may pose risk for immunogenicity for certain routes of administration due to the potential for aggregation and peptide-related impurities". Certain routes. Aggregation and impurities. Both are testable properties, and neither is answered by a percentage on a bottle.

A dry powder and a ready made solution invite different tests:

• A dry powder is normally documented for purity, identity and quantity, which is exactly what the Selank certificate covers. Aggregation and degradation are slowest in the dry state, which is why lyophilisation is used at all.
• A solution has been in water since it was filled, so it carries questions a powder does not: microbial content, preservative system, pH, and stability of the peptide over the bottle's stated life. A percentage tells you none of that.
• Anything injected raises the bar again, to bacterial endotoxins and sterility.

Two certificates are published for the Selank vial and they answer that question differently. Lot 29-01260229 contains no bacterial endotoxins test and no sterility screen at all. Lot 29-05260628 carries an endotoxin result below 0.20 EU/mL against a 0.5 EU/mL limit by kinetic chromogenic LAL to USP Chapter 85, plus a rapid sterility screen returning no growth. One caveat belongs with the good news: that document describes its own sterility method as a preliminary screen suitable for quality control, and says full compendial testing may be required for regulatory purposes. So the lot code decides your evidence, and even the better lot is a screen rather than a compendial release test. Our Selank sourcing guide works through that comparison lot by lot.

Selank acetate (TP-7) sits on FDA's list of bulk drug substances nominated but withdrawn, is absent from all three current 503A categories, and holds no FDA approval for any indication. Neither format changes that, and no spray sold anywhere in the United States carries an approval behind it.

A price per milligram assumes you use the material. Anything that expires unused raises the effective rate, and the two formats run different clocks.

A lyophilised vial is stable in the dry state under cold storage and the clock only starts when solvent goes in. A prefilled spray has been in solution since the day it was filled, so its stated shelf life is running when it reaches you and the remaining portion of it is what you are actually buying. A bottle that arrives with a third of its life gone is a third more expensive per milligram than the sticker suggests, and that arithmetic is worth doing before the purchase rather than after.

Residue in the vial shoulder and the needle hub is the vial's version of the same waste, and on a 2 mL made up vial 0.05 mL is 2.5 percent of the volume. General handling and cold chain expectations for research material are covered in our peptide storage guide. It is a storage reference, not a preparation guide, and this page is not one either.