Selank Price: $2.38/mg Labelled, $1.93 to $2.00 Assayed

There is a single Selank listing, so every row below buys the same material under different terms. Read the last column, because cost per milligram is the only figure that survives a comparison against another storefront.

The division is trivial and that is the point. A 10 mg vial holds ten milligrams, so every price in the second column moves the decimal one place to give the rate in the fifth. $47.50 becomes $4.75, and $23.75 becomes $2.375, which rounds to $2.38 and is the figure quoted everywhere on this page. Tier totals are calculated on the unrounded per vial price, so a cart may show a cent either way.

Inverted, a dollar buys 211 mcg at list and 421 mcg with the code. Quoting both directions in one sentence is how price pages accidentally claim a discount twice.

Every figure above counts ten milligrams because that is the number on the label. Both published certificates count something else.

MZ Biolabs analysed lot 29-01260229 on 7 February 2026 and reported a measured quantity of 12.29 mg per vial, purity of 99.32%, and identity by mass spectrometry: expected monoisotopic mass 751.43 Da against a measured 751.47 Da, about 53 parts per million apart. Kovera Labs certified lot 29-05260628 on 2 June 2026 with a net content of 11.86 mg, purity of 99.371% and identity by LC-MS. Both vials are overfilled, by 22.9 and 18.6 percent, and both numbers were published rather than quietly banked.

Two cautions before anyone quotes $1.93 as the Selank price. Each measurement belongs to one lot, and overfill is a manufacturing tolerance rather than a promise any listing commits to. The 43 cent spread between the two certified lots is the size of that tolerance in practice. The purity row exists because purity and quantity are different questions: 99.32% of 12.29 mg is 12.21 mg of Selank and about 0.08 mg of something else, shown on the chromatogram as one small peak at 6.36 minutes.

The headline is $2.38 per milligram, because that is what the label entitles you to. The footnote is that the two certified lots delivered milligrams between $1.93 and $2.00. Both belong on the page, and only the first is a number to quote at anyone.

The vial arrives as dry powder and has no concentration until you give it one. The volume of bacteriostatic water you choose sets the mg/mL and the smallest quantity a barrel can resolve, and it does not touch the price by a cent.

At 2 mL the arithmetic is as clean as this compound gets. One unit on a U-100 barrel is 0.01 mL, which at 5 mg/mL holds 50 mcg, so 10 units draws 500 mcg and the whole vial is two full barrels of volume. Our Selank reference page works the same vial at 3 mL, which is 3.33 mg/mL and 15 units for that same 500 mcg, so read its concentration as its own figure.

Notice what the last column does, which is nothing. It reads $1.19 in every row because 500 mcg is half a milligram and half a milligram costs half of $2.375 whatever volume it is dissolved in. Cost per unit is the opposite: $0.238 at 1 mL, $0.119 at 2 mL, $0.048 at 5 mL, all for the same purchase. That is why cost per unit only compares across vials when the concentrations match, and why this site prices per milligram.

Handling volumes are covered in our reconstitution guide, and the Selank reconstitution calculator will run any volume you enter. These are laboratory handling numbers for research material, not instructions for anything else.

Overfill is good news for cost per milligram and awkward news for concentration, and almost nobody runs the second calculation. Put 2 mL into a vial you believe holds 10 mg and you write 5 mg/mL on the label, treating each unit as 50 mcg. If the vial in fact holds 12.29 mg, the solution is 6.145 mg/mL and each unit holds 61.45 mcg, so every volume drawn contains 22.9 percent more material than your arithmetic says.

The fix is arithmetic, not chemistry. Divide the measured quantity on your own lot certificate by the diluent volume and use that as the concentration, rather than dividing the label figure. If no measured quantity is published for your lot, the label figure is all you have.

This is why the per milligram price is worth calculating twice. Whoever bought lot 29-01260229 paid $1.93 for each milligram actually present and received 2,290 mcg more than the listing promised. Whoever buys the next lot may get exactly 10 mg. Neither was misled, because the number was published either way.

Cost per milligram is only useful next to another cost per milligram. Here is the same code applied across the listings this site already breaks down.

Selank is the cheapest peptide vial per milligram here, marginally ahead of BPC-157 at $2.45 and less than half the retatrutide rate. The NAD+ row is in a different unit world and is only present to show why: a coenzyme sold by the gram and a heptapeptide sold in fractions of a milligram do not belong in one column, which is why our NAD+ price breakdown quotes per 100 mg.

The nearer comparison is the BPC-157 price page: same vial size, same discount, seven cents a milligram apart, which is 70 cents on a vial. Anyone choosing between them on price alone is choosing on noise, and should be reading what the certificates cover instead.

One caveat travels with every row. Per milligram pricing compares mass, never potency. Selank has a formula weight of 751.9 and retatrutide is roughly six times heavier per molecule, so identical milligrams are not identical numbers of molecules, and nothing on this page suggests otherwise.

A rate per milligram measures one thing. Four things it does not measure move the real cost of a Selank purchase further than any discount on this page.

• Endotoxin and sterility testing, which depends on your lot. Two certificates are published for this listing and they cover different ground. Lot 29-01260229 stops at purity, quantity and identity, with no bacterial endotoxins test and no sterility screen anywhere in it. Lot 29-05260628 adds an endotoxin result below 0.20 EU/mL against a 0.5 EU/mL limit by kinetic chromogenic LAL to USP Chapter 85, a rapid sterility screen returning no growth, and heavy metals all under limit. Same price, same listing, materially different evidence, so the lot code on the vial decides which one you have.
• The immunogenicity question FDA has raised. FDA writes that 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". Aggregation and impurities are measurable, so a certificate that stops at 99.32% purity has answered half that sentence.
• Regulatory standing. Selank acetate (TP-7) appears on FDA's "bulk drug substances nominated but withdrawn" list: nominated, placed in category 2 under the interim policies, then withdrawn by the nominator. It appears in none of the three categories on the lists updated 14 May 2026, and is not FDA approved for any indication. Our page on the legal position works through what that means.
• Landed cost. A flat carriage charge divides by ten milligrams rather than scaling with them, so it lands hard on a single vial. Free shipping starts at $250, which the code pushes further away because it halves the number the threshold measures. Our domestic supply page runs that arithmetic.

One smaller effect belongs here because it is large on a vial this size. Solution left in the vial shoulder and needle hub cannot be recovered. Take 0.05 mL as lost on a 2 mL made up vial and that is 2.5 percent, moving the effective rate from $2.38 to $2.44 per milligram. No coupon touches it.