Selank Coupon: Half of $47.50, Then Divide by 12.29

One vial, two prices, and the per milligram rate underneath each of them.

The saving is $23.75 on the cart line and $2.37 on every milligram. Read backwards, a dollar buys 211 mcg at list and 421 mcg with the code. Those are the same fact stated three ways, and quoting more than one of them in a single sentence is how a discount gets counted twice.

The listing also shows $47.50 as reduced from $60.00. Treat the $60.00 as display pricing rather than as a second discount to add on top: the number the code actually operates on is $47.50, and $23.75 is what the cart should read.

Buying three, five or ten vials takes 3%, 5% or 10% off the list price. The code takes 50% off one. Run both ladders and they never meet.

The best rung on the tier ladder is $4.28 per milligram, which is 80 percent more than the $2.38 a single vial costs with the code, and reaching it means committing $427.50 and taking delivery of a hundred milligrams. A 10 percent discount cannot catch a 50 percent one. The same shape holds across this storefront: our MOTS-c coupon breakdown and BPC-157 coupon breakdown reach the identical verdict on different vial sizes, which is a reasonable sign the tiers are a volume convenience rather than a pricing strategy.

Tier totals here are calculated from the unrounded per vial figure, so a cart may differ by a cent. $47.50 less 3 percent is $46.075, which we show as $46.08 but multiply as $46.075.

The coupon discounts a price. The certificate changes the denominator.

MZ Biolabs analysed lot 29-01260229 on 7 February 2026 and reported a measured quantity of 12.29 mg per vial, with purity of 99.32% by HPLC-UV and identity confirmed by mass spectrometry against an expected monoisotopic mass of 751.43 Da. The vial was overfilled by 22.9 percent, and the number was published rather than kept quiet.

Divide the coupon price by that mass and $23.75 buys milligrams at $1.93 each. The second published lot, 29-05260628, is certified at 11.86 mg, which puts the same $23.75 at $2.00 per milligram. All three numbers are correct and they answer different questions:

• $2.38/mg is what the listing entitles you to, and the only figure to quote when comparing storefronts.
• $1.93/mg is what lot 29-01260229 delivered, and $2.00/mg is what lot 29-05260628 delivered. Both are manufacturing tolerance rather than a commitment, and no listing anywhere promises either.
• The 43 cent gap between those two lots is the honest measure of how far a per milligram figure moves between fills.

Quote the first, know the second, and check your own lot number against whatever certificate the vendor publishes when the box arrives. The full working, including what the overfill does to the concentration you write on the vial, is on our Selank price breakdown.

Free carriage starts at $250, and halving the price of every vial pushes that line further away rather than closer, because the threshold is measured in dollars and the code removes dollars.

Ten vials at the code price is $237.50 and falls short. Eleven is $261.25 and clears. Nobody should buy 110 mg of a research peptide to avoid a carriage charge, which is the practical answer: on a one or two vial order, treat shipping as a cost that lands on top and add it to your per milligram figure yourself. A flat charge divides by ten milligrams on a single vial, so even a modest fee moves the rate noticeably.

Whether the threshold reads the subtotal before or after the discount is a cart rule, and the cart is the only thing that can settle it. Look at the shipping line on the payment screen rather than planning an order around an assumption.

The obvious question is whether the 10 percent tier and the 50 percent code apply together, which would put ten vials at $213.75 and $2.14 per milligram. We have found nothing that documents that behaviour, and we are not going to assert it.

Treat stacking as something to observe rather than something to plan. Put the order in the cart, apply the code, and read the totals. If both discounts land, the number on the screen will show it. If only one lands, the single vial code rate remains the cheapest milligram available and nothing about the decision changes.

Two smaller cautions belong with that. Percentage codes are usually applied to the list price rather than to an already tiered price, so the order of operations matters and only the checkout knows it. And a code that has expired simply fails, which costs you nothing but a retype. Nothing on this page is a reason to hold an order open waiting for a better combination to appear.

A coupon moves the price and leaves everything else exactly where it was.

It does not add a test to the certificate, and the certificates differ. Two are published for this listing. Lot 29-01260229, analysed by MZ Biolabs, covers purity, quantity and identity and carries no bacterial endotoxins test and no sterility screen at all. Lot 29-05260628, certified by Kovera Labs, 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 under limit. The code takes the same $23.75 off either one, so the discount is fixed and the evidence is not. The lot code on your vial decides which you are holding, and that is checkable in about a minute.

It does not change what FDA has said. 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", and that it "lacks important information regarding any safety issues raised by selank acetate administered to humans". Aggregation and peptide-related impurities are testable properties, which is precisely why the missing endotoxin line matters more than the missing 50 percent would.

It does not change the regulatory position. Selank acetate (TP-7) sits on FDA's list of bulk drug substances nominated but withdrawn, absent from all three current 503A categories, and holds no FDA approval for any indication. Our page on the legal position takes that apart in full.

And it does not make a cheap vial the right vial. At $2.38 per milligram Selank is already the least expensive peptide vial this site prices, a whisker under BPC-157 at $2.45. When two listings sit seven cents a milligram apart, the deciding factor is what the certificates cover, not what the codes take off.