Description
The Cartalax 20mg vial is a laboratory reference material and nothing else. The compound is a short synthetic peptide from the Khavinson range, catalogued as Cartalax. The fill weight is 20 mg of net peptide content. Appearance is white to off-white, sealed under vacuum, with the lot number printed on the label. It is not a food, not a drug, and not for human or veterinary consumption.
It belongs to the short peptide range catalogued under the Khavinson names, where the name is a supplier convention rather than a description of anything. The label on the Cartalax 20mg vial carries the compound, the fill weight and the lot number, and that is the extent of it.
What is in the Cartalax 20mg vial
The table below is the standing description of the Cartalax 20mg vial. Measured values live on the lot certificate.
| Specification | As supplied |
|---|---|
| Compound | Cartalax |
| Vial content | 20 mg net peptide content |
| Form | Lyophilized, white to off-white, sealed under vacuum |
| Sequence length | On the lot certificate |
| Purity | HPLC, percent of total peak area |
| Identity | Mass spectrometry against expected mass |
| Water | Karl Fischer titration, percent by weight |
| Documentation | Independent certificate of analysis, tied to the lot number |
| Price basis | About $4.95 per milligram as priced |
| Supplied for | Laboratory research use only, not for human or veterinary consumption |
Why it is a powder, and what a milligram of the Cartalax 20mg vial costs
Lyophilization takes the water out without ever letting it be liquid. Freeze, pull a vacuum, and the ice leaves as vapour. Material is supplied in that state because water is the main thing that degrades a peptide, and because a dry solid survives a courier network that a solution would not. The cake takes up much more room than the peptide itself, which is why a small fill can look surprisingly bulky in the vial. Nothing about the Cartalax 20mg vial is sold by volume.
Doing the division
Milligram content is the unit the Cartalax 20mg vial is sold in, because it is the only figure that makes two listings comparable. At the listed price this comes to something like $4.95 per milligram. It is printed under the price rather than buried, because the alternative is a page where a large vial and a small one cannot be compared at all. Compare the Cartalax 20mg vial on that basis rather than on the price of the glass. The case is made at greater length in why price per milligram beats the price on the bottle.
The documentation that comes with the Cartalax 20mg vial
Read the certificate from the top and check the identifiers before the numbers. Lot number first, matched against the vial. Date of analysis next, because an old date on a new lot is a sign the document has been recycled. Then purity, then the mass spectrometry comparison, then water content, then the signature and the name of the laboratory. A sheet missing the lot number is not a certificate, it is a leaflet. The certificate issued with the Cartalax 20mg vial is specific to the lot and not to the product line.
The assay is performed by a contract laboratory unconnected to this business. Any lot that comes back below its stated milligram content is pulled from sale, and the certificate stays published on the results page with everything else instead of quietly disappearing. Stock is withdrawn from sale where the certificate for the Cartalax 20mg vial does not support the figures here. See how to read a certificate of analysis and why we publish the batch that failed.
Behind the figures
The peptide has to be told apart from everything else in the cake. Counter ions left over from purification, residual moisture and any added bulking agent all weigh something, so a gross weight overstates how much sequence is present. The useful figure is net peptide content, and that is the figure quoted for the fill. The same methods are run on the Cartalax 20mg vial as on every other lot on this shelf, and formulae and expected masses for compounds of this class can be checked through the NCBI chemistry and literature databases.
Why the name is inconsistent, and how to store the Cartalax 20mg vial
Abbreviations here are inherited rather than designed. They come from the groups that first made a compound, from ingredient registers, from development programmes and from vendors, so two listings can look different and be identical. Some names in this category spell out an intended effect once expanded. Those stay abbreviated, because writing them out would turn a catalogue entry into an assertion about biological activity. The catalogue name carried by this vial is the one the trade uses, and a trade name is not an identifier.
Storage is the usual practice for dry peptide material: sealed, refrigerated at 2 to 8 degrees Celsius over short intervals, frozen at minus 20 degrees Celsius or colder over long ones. Avoid moving it in and out of the cold repeatedly, because moisture condenses on cold glass. Keep the certificate with the vial, since the lot number is the only thing joining the two.
Research use only, and what this page will not tell you
This is a laboratory reference material. It is not for human or veterinary consumption, it is not a food and it is not a drug. There is no dose on this page, no timing, no route, no site and no reconstitution method, and asking for any of them will not produce them. Bacteriostatic water, diluents and syringes are stocked separately and are not sold as a set with this item. No part of this page describes a use for this material in a person or an animal.
A research use only statement is not a legal strategy and is not treated as one here. Warning letters in this area turned on what the rest of the page said, not on whether a disclaimer was present. See research use only is not a legal strategy.
Withdrawn lots stay published alongside the rest rather than quietly disappearing. The page is a specification, and the specification is all of it. This item sits on the longevity shelf, inside the research peptide catalogue, and every certificate we hold is on the lab results page.
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