Selank Where to Buy: $2.38/mg, and 0.20 EU/mL on One Lot

Every criterion here is checkable from a public document in about a minute, and none requires trusting a storefront's description of itself. Ordered by what they eliminate rather than by how often they are advertised.

Criteria 5 and 6 are the ones almost no research-chemical listing satisfies, and the ones FDA's concern points at directly. Criteria 1 to 4 establish that the milligrams you divide the price by are real, and criterion 7 decides whether any of it can be checked by anyone but the seller. Missing from the list: reviews, reputation and years in business, none of which produce a document.

Ascension Peptides publishes two third-party certificates against the Selank 10 mg listing, from two different laboratories, for two different lots. They do not test the same things, and that is the single most useful fact on this page.

Read the endotoxin row twice. Lot 29-01260229 is covered by a document that reports purity, identity and quantity and stops there. Lot 29-05260628 is covered by one that answers criteria 5 and 6 as well. Same product page, same price, different evidence.

So the practical version of where to buy Selank is narrower than it looks: buy from a seller that publishes lot-level certificates, then read the one matching the code on your vial rather than the one at the top of the page. A vendor that has published a full panel once has not published it for your batch.

Most compounds on this site carry a regulatory position that reads as a shrug. Selank carries a written one. On its page listing bulk drug substances that may present significant safety risks, current as of 22 April 2026, FDA says of this compound:

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. FDA lacks important information regarding any safety issues raised by selank acetate administered to humans.

Aggregation is peptide molecules clumping into higher-order assemblies, and peptide-related impurities are the truncated and modified sequences synthesis leaves behind. An immune system can recognise both as foreign and neither is visible in a vial. What makes them tractable is that both are measurable: chromatography sees them, and endotoxin and microbial testing cover the contamination that compounds the risk.

The regulatory position, stated correctly

Selank appears on FDA's 503A bulk drug substances list in no category at all. It was nominated, and the nomination was withdrawn, which is recorded on that same safety-risks page under nominated but withdrawn substances. Category 2, the list of substances FDA identified as raising significant safety risks, currently holds six entries: cesium chloride, domperidone, germanium sesquioxide, ibutamoren mesylate, kisspeptin-10, and quinacrine hydrochloride for intrauterine administration. Selank is not among them.

Pages calling Selank Category 2 or banned from compounding are wrong, and the correct version is not more permissive: nominated, withdrawn and unlisted leaves a compounder no defensible route and no approval to fall back on. FDA's compounding material names the substance Selank acetate (TP-7), so the search is easy to repeat.

One listing, one vial size, and four honest ways to state the rate. The first two divide by the label. The second two divide by what a laboratory weighed.

Both certificates report more material than the label promises, which is the opposite of the usual direction and worth crediting. It is also worth stating plainly: neither figure is a guarantee. An overfill is a property of a batch on a date, not a term of sale, and nothing on the listing commits to it. Compare on $2.38, treat $1.93 or $2.00 as what one lot turned out to hold, and notice that the two assayed lots differ from each other by 0.43 mg.

The full division, including what the quantity tiers do and what happens on a syringe barrel, is worked through on our Selank price breakdown. The short version for a purchasing decision: the tiers take 3%, 5% and 10% off the list price at three, five and ten vials, which lands at $4.61, $4.51 and $4.28 per milligram, all of them roughly double what the code does to a single vial.

The same seven criteria applied to the supplier this page links to, evidence named so you can disagree with it.

Five clear passes, two rows that depend on which box you receive. That is better than most of this market and still short of a pharmaceutical release specification, which is the accurate conclusion rather than a disappointing one. One more line of arithmetic on the February certificate: 0.68% of the measured 12.29 mg is about 84 micrograms per vial of UV-detected material that is not Selank.

The same exercise elsewhere reaches different verdicts. Our BPC-157 source ranking deals with a market where nobody publishes a measured quantity, and the NAD+ buying criteria cover a compound where FDA has documented adverse events traced to endotoxin in material that passed purity testing.

• A certificate covers a sampled aliquot on a date. Filling, capping, storage and transit all happen after the laboratory has finished. The document is evidence about a batch, not about the vial in your hand.
• A rapid sterility screen is not compendial sterility testing. The Kovera report says so itself: it describes the method as a preliminary assessment suitable for quality control and notes that full compendial sterility testing may be required for regulatory compliance.
• No certificate converts research material into a drug product. An endotoxin figure compares two suppliers. It clears nothing for use in a person, and FDA's statement that it lacks important information about safety issues in humans is not resolved by a laboratory report.
• Nasal spray listings answer a different question. People searching selank nasal spray where to buy are looking at a pre-mixed consumer format with a shelf life, a preservative question and rarely a lot-level certificate. Ascension sells the lyophilised vial, not a spray.

Once a vial is on the bench the numbers stop being about vendors. A 10 mg vial reconstituted at 2 mL is 5 mg/mL, so one unit on a U-100 barrel holds 0.05 mg and ten units hold 500 micrograms, purely as laboratory handling arithmetic. Choosing 1 mL doubles the concentration and halves the resolution without changing what a milligram cost. Our reconstitution guide, the syringe measurement guide and the Selank calculator handle that half.