Description
The thymosin alpha-1 5mg vial is a laboratory reference material and nothing else. The compound is a twenty-eight residue thymic peptide. Fill weights of 5 mg and 10 mg are offered here, chosen before you order. 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.
The same material is catalogued elsewhere as Ta1. The label on the thymosin alpha-1 5mg vial carries the compound, the fill weight and the lot number, and that is the extent of it.
The thymosin alpha-1 5mg vial, specified
What follows is the specification for the thymosin alpha-1 5mg vial, with the measured figures on the lot certificate.
| Compound. | Thymosin alpha-1 |
|---|---|
| Vial content. | 5 mg or 10 mg, chosen on this listing |
| Form. | Lyophilized, white to off-white, sealed under vacuum |
| Sequence length. | Twenty-eight residues |
| 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. | Per milligram figure shown against each strength |
| Supplied for. | Laboratory research use only, not for human or veterinary consumption |
Lyophilized powder, and the price per milligram of the thymosin alpha-1 5mg vial
Freeze drying is the standard way to supply a peptide, and what it does is simple enough. The frozen solution is held under vacuum until the ice has left as vapour, which strips out the solvent without cooking the molecule. The result is a dry, porous solid with a measured moisture content. Appearance is not a specification. Fill weight, purity and water content are the specifications. Nothing about the thymosin alpha-1 5mg vial is sold by volume.
The arithmetic
Milligram content is the unit the thymosin alpha-1 5mg vial is sold in, because it is the only figure that makes two listings comparable. With several fill weights on one page, there is no single per milligram figure to quote. There is a method. Divide each option price by the milligrams in that option, then compare the quotients rather than the prices, and read the assay percentage from the certificate alongside them. Compare the thymosin alpha-1 5mg 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 certificate of analysis for the thymosin alpha-1 5mg vial
What a certificate of analysis should contain is not mysterious. The compound as named. The lot. When it was tested. The purity figure and the chromatogram it came from. The observed mass against the calculated mass. The water content. Who did the testing. Where any of those are absent, the document is describing less than it appears to describe. The certificate issued with the thymosin alpha-1 5mg 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 thymosin alpha-1 5mg vial does not support the figures here. See how to read a certificate of analysis and check the lab before you check the numbers.
Behind the figures
Karl Fischer titration gives the water content, stated as a percentage. A lyophilized cake is never bone dry, and the point of measuring is to know by how much it misses. Moisture that stayed behind in the cake is moisture that can take the peptide apart slowly in storage, and it is also weight that is not peptide. The same methods are run on the thymosin alpha-1 5mg vial as on every other lot on this shelf, and formulae and expected masses for compounds of this class can be checked through the FDA drugs section.
Naming, abbreviations and storage
Expect the same compound under several names. Transliteration adds variant spellings on top of that, which is why sequence and measured mass, not the title of a listing, are the identifiers that hold. Where an abbreviation expands into a statement about what a compound does, the abbreviation is what appears here, in the title, the web address, the image description and the text alike. The catalogue name carried by this vial is the one the trade uses, and a trade name is not an identifier.
Handling notes are short. Sealed, dry, cold and dark, at 2 to 8 degrees Celsius for the short term and minus 20 degrees Celsius or below for anything longer. The stability window for the lot is printed on this listing. Keep the certificate with the vial, since the lot number is the only thing joining the two.
Research use only: this vial is a reagent
Research use only, not for human or veterinary consumption. That sentence is a description of what is being sold and not a disclaimer appended to something else. There is accordingly no dose, no cycle, no route of administration and no reconstitution guidance anywhere on this page, and the omission is the policy rather than a gap in the copy. No part of this page describes a use for this material in a person or an animal. Bacteriostatic water, sterile diluents and syringes are stocked separately rather than sold as a set with the vial.
The limits of that sentence need stating. A research use only line describes what is sold, it is not a shield, and the enforcement record shows whole product pages being read rather than disclaimers alone. See research use only is not a legal strategy.
Every figure quoted here comes from the document linked above, and older certificates are kept rather than retired. That is the whole of the claim being made. This item sits on the repair and recovery shelf, inside the research peptide catalogue, and every certificate we hold is on the lab results page.
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