Description
Listed as a laboratory reference material, the TB-500 5mg vial is a synthetic fragment of thymosin beta-4, freeze dried and sealed under vacuum. Fill weights of 5 mg and 10 mg are offered here, chosen before you order. The cake is white to off-white. Not for human or veterinary consumption, and neither a food nor a drug.
The label on the TB-500 5mg vial carries the compound, the fill weight and the lot number, and that is the extent of it.
The TB-500 5mg vial, specified
Everything that can honestly be said about the TB-500 5mg vial before the certificate is opened is listed below.
| Specification | As supplied |
|---|---|
| Compound | TB-500 |
| Vial content | 5 mg or 10 mg, chosen on this listing |
| 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 | Per milligram figure shown against each strength |
| Supplied for | Laboratory research use only, not for human or veterinary consumption |
The format, the fill weight and the milligram arithmetic
Peptides are shipped dry for a simple reason: in solution they degrade, and nobody can control the temperature of a parcel in transit. Freeze drying removes the solvent under vacuum and leaves a solid with a low residual water figure, which the certificate states. The cake that results is physically fragile and can break loose and rattle. A broken cake is cosmetic. The number that matters is the fill weight. Nothing about the TB-500 5mg vial is sold by volume.
The arithmetic
Milligram content is the unit the TB-500 5mg vial is sold in, because it is the only figure that makes two listings comparable. This listing has more than one strength, so the arithmetic has to be done per option: take the price of the option and divide it by its milligram content. The result is printed under each price. It is the number that makes two vial sizes, and two vendors, comparable at all. Compare the TB-500 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 TB-500 5mg vial
The certificate is the product description that actually counts. It names the compound and the lot, gives the date the work was done, prints the purity percentage and the trace it was integrated from, records the measured mass beside the expected mass, states the water content, and identifies the laboratory. If you only ever read one thing on this page, read that document. The certificate issued with the TB-500 5mg vial is specific to the lot and not to the product line.
Assays are run by an outside contract laboratory rather than in house. Independence of that kind matters, and it has a limit: the figure still depends on the sample that was submitted, which is why lot by lot testing rather than periodic testing is the part that matters. Stock is withdrawn from sale where the certificate for the TB-500 5mg 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
A fill weight only means something once you know what has been weighed. Salt forms, residual water and bulking agents all contribute mass without contributing sequence. The convention followed here is net peptide content, so the milligram figure refers to the compound rather than to the total contents of the glass. The same methods are run on the TB-500 5mg vial as on every other lot on this shelf, and formulae and expected masses for compounds of this class can be checked through PubChem at the NCBI.
Why the name is inconsistent, and how to store the TB-500 5mg vial
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. 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.
Sealed, cold, dark and dry. Short term storage at refrigerator temperature and long term storage at minus 20 degrees Celsius or colder are the standard conditions for lyophilized peptide material of this kind. Keep the certificate with the vial, since the lot number is the only thing joining the two.
What this listing refuses to say
The material is a reagent. It is not a medicine, not a supplement, not for human or veterinary consumption, and it is sold for in vitro and laboratory work by purchasers qualified to handle it. You will not find a dose, a schedule, an injection site or a mixing instruction here. Those belong to a use that is not offered. 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.
Two things are true at once. This is sold as a laboratory reference material, and that sentence on its own settles nothing, because a page that describes effects, timing or quantities for a person is describing a use whatever the footer says. See research use only is not a legal strategy.
Read the certificate, check the lot number against the vial, and the listing has told you everything it can tell you. 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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