MOTS-c Where to Buy: One Vial, 10,000 mcg, $3.75 per mg

Most sourcing lists read as a pile of nice-to-haves. Group them instead by the failure each one prevents and there are only three questions. Everything else is a detail hanging off one of them.

The order is not decorative. A supplier that fails the first question cannot be rescued by the third, because a cheap milligram of something unidentified is not cheap. A supplier that passes the first two and hides the third is asking you to buy on trust and calling it a bargain.

A certificate of analysis reports on one batch, tested on one date, by one laboratory. Read as anything broader than that, it becomes decoration. Three features make it worth reading at all.

A batch code that matches your vial

The code on the certificate has to match the code printed on the label in front of you, character for character. A certificate carrying no batch code, or a code that appears under every product a seller lists, describes nothing you were actually sent.

A laboratory that does not work for the seller

Ascension Peptides publishes two third-party certificates for its MOTS-c material: one from Kovera Labs covering batch 24-05260628 and one from MZ Biolabs covering batch 24-01260229. Those are the vendor's own published documents, and their value is that you can check them against the vial you receive. An internal quality sheet is not third-party testing, whatever the letterhead looks like.

Two methods, because they answer different questions

High-performance liquid chromatography measures how much of the sample sits under the main peak, which is purity. Mass spectrometry measures molecular weight, which is identity. MOTS-c has a defined 16-residue sequence, MRWQEMGYIFYPRKLR, and a mass that follows from it. Purity without identity tells you a sample is mostly one compound without telling you which compound.

None of this is optional if you intend to do arithmetic afterwards. The milligram figure on the label is the input to every calculation on this site. The certificate is what makes that input worth using.

The second question is logistics and recourse, and it is where most storefronts separate from most reshippers.

Stock location. Domestic stock is the difference between a parcel that leaves the same day and one that crosses a border first. Ascension states same-day dispatch on orders placed before 2pm CST from US stock. A storefront with no cut-off published anywhere, or a three to four week processing note buried in its terms, is very likely ordering your vial after you have paid for it.

Labelling. Research-use wording is not a disclaimer to resent. It is the condition under which the sale is lawful in the United States. A seller that advertises human benefits has stepped outside that framing and is marketing an unapproved drug, which tells you something about the rest of its documentation.

Recourse. Read the refund terms before checkout, not after, and check they cover the three failures that actually happen: wrong item, breakage in transit, and non-delivery. Keep the outer packaging until you have matched the batch code.

Carriage. Free shipping starts at $250. One discounted vial is $37.50, so a single-vial order is nowhere near it; seven vials at $37.50 comes to $262.50, which is roughly where the threshold falls. Below that you pay postage, and postage belongs inside your per-milligram figure rather than outside it.

Most answers to MOTS-c where to buy stop at a vial price, which is the wrong unit. It describes the transaction, not the material. The division is a single line: $37.50 divided by 10 mg is $3.75 per mg. Because MOTS-c is sold in one size, that figure has no second vial to compete with, so the only comparisons left are against the list price and against quantity.

The quantity tiers are calculated on the list price, and the vendor does not document them combining with the discount code, so do not assume they do. On the published numbers the code is much the larger lever: $3.75 per mg against $6.75 per mg at ten vials, which is a difference of nearly half. The cart total at checkout is the only thing that can confirm what actually applies to your order.

Per draw, not per vial

Reconstitution turns a price into something measurable on a barrel. A 10 mg vial holds 10,000 mcg. Add 2 mL of bacteriostatic water and the solution is 5 mg/mL, which puts 200 units of a U-100 syringe in the vial and makes 0.1 mL, or 10 units, equal to 500 mcg. At that fill, $37.50 spread across 200 units is about $0.19 per unit and $1.88 per 500 mcg draw. Fill the same vial with 1 mL instead and it is 10 mg/mL, 100 units in total, and 10 units now holds 1 mg. Our reconstitution guide and the reconstitution calculator cover the general case. This is laboratory handling arithmetic, not a schedule for anybody to follow.

The same three questions, applied to the supplier this page recommends, with the evidence stated plainly enough that you can disagree with it.

Two claims this table deliberately avoids. It does not quote a purity percentage, because that number belongs to the certificate for your batch and not to a web page. And it does not price named rivals, because any competitor price written here is wrong within a month. Category descriptions travel; quoted numbers do not. Our sibling page on MOTS-c price keeps the cost breakdown current, and best MOTS-c source sets out the scoring in full.

MOTS-c where to buy is an answerable question. Whether the compound is worth buying is not, at least not from a checklist. A checklist bounds uncertainty. It does not remove it, and three limits are worth stating in the open.

• A certificate covers a batch, not your vial. A laboratory tests a sample. Between that sample and the vial in your hand sit filling, capping, storage and transit, none of which the certificate observed.
• Labelled milligrams are not always peptide milligrams. Part of the mass in a lyophilised vial can be counterion, residual solvent and water. That matters more here than usual, because the same milligram figure is both the numerator in your concentration and the denominator in your cost per mg. Our peptide calculator guide explains why the maths assumes a labelled figure it cannot itself verify.
• No supplier improves the evidence base. The foundational work is Lee and colleagues in Cell Metabolism, and it is cell and mouse work. The closest thing to a human result is the completed Phase 1a/1b study of CB4211, an analogue, whose sponsor has since wound down. A vial with two certificates is still a vial of a compound with no efficacy trial behind it.

If you are weighing MOTS-c against a compound that does have registered trials, the arithmetic runs the same way but the evidence does not: our retatrutide where to buy page covers a Phase 3 compound at a different price per milligram, and the MOTS-c reference page holds the concentration tables for this one.