Amino Axiom Vendor Status Tracker FAQ for Growth-Factor Research

What is the Amino Axiom vendor status tracker?

The vendor status tracker is a page within Amino Axiom, a free research information and tracking platform. Where the vendor directory describes suppliers that are operating, the tracker records the ones that are not: which research vendors are defunct, the reason given for each, and a timeline of FDA enforcement actions in the research-materials market. The page is at Amino Axiom's vendor status tracker, and the platform's homepage is aminoaxiom.com.

For a laboratory that sources growth-factor and receptor-binding materials, the tracker answers a bookkeeping question that has real consequences for a study: is the supplier named in an older protocol, a prior purchase record, or a citation still in business? This FAQ explains what the page shows and how a researcher might read it. It covers sourcing information only.

What does the tracker list?

Each entry names a vendor and gives its status along with the reason recorded for that status. The reasons are the useful part, because a vendor can stop operating for different reasons: voluntary closure, a business decision, or an enforcement action. A separate timeline lays out FDA enforcement events in date order, so a reader can see how the set of defunct vendors lines up with regulatory activity over time.

The page is descriptive. It reports status and stated cause and makes no claim about the quality of anything a vendor once sold. A vendor appearing on the list tells a researcher that sourcing from that name is no longer possible, and that is the extent of the inference.

Why would a growth-factor lab care about defunct vendors?

Because research programs run longer than vendor lifetimes. A multi-month series of binding-kinetics or reporter-gene experiments may be designed around a specific material from a specific supplier, and reproducing the work later means finding that material again. If the original source has closed, the continuity of the program depends on identifying a replacement and confirming that the replacement is the same thing.

Follistatin makes the point well. It is a secreted glycoprotein studied as a ligand trap for activin and GDF-8 within the TGF-β superfamily, and the Amino Kinetics catalog describes it in two forms: a recombinant form of roughly 37,000 to 40,000 Da and a synthetic truncated form of roughly 3,780 Da, under CAS number 117628-82-7. If an earlier study used one form from a supplier that no longer exists, the replacement has to match the form, not merely the name. The tracker tells the researcher the original source is gone, which is the trigger to start that matching process.

How should the stated reasons be read?

Cautiously, and as recorded text rather than verified fact. The tracker presents the reason attached to each entry. A researcher reading it should treat the reason as context for the timeline, not as an assessment of the materials involved. A vendor that closed for business reasons and one that ceased operating after an enforcement action are both simply unavailable as sources.

What the reasons do help with is pattern recognition. Seeing several closures cluster around a particular period on the enforcement timeline tells a researcher something about how stable the supplier landscape has been, which in turn informs how much redundancy to build into a long program. A lab that depends on a single source for a hard-to-replace recombinant protein has more exposure than one that has qualified two.

How does the tracker help with an analog such as IGF-1 LR3?

IGF-1 LR3 is a modified analog of insulin-like growth factor 1, studied for reduced affinity for IGF binding proteins and engagement of the IGF-1 receptor. The Amino Kinetics catalog lists it with CAS number 946870-92-4, a molecular weight of 9117.5 g/mol, and the formula C400H625N111O115S9. Because it is a larger, more complex molecule, fewer suppliers carry it, and losing one is more disruptive than it would be for a widely stocked short peptide.

A practical use of the tracker here is as a check on the supplier list a lab already holds. A researcher reviewing old purchase records for IGF-1 LR3 can compare the supplier names against the tracker, flag any that are no longer active, and then go to the identifying values in the compound library to confirm what a replacement listing needs to match. The molecular weight and CAS number are the fixed points; the supplier name is the part that changes.

Does a vendor's absence from the tracker mean it is safe to use?

No. The tracker is a list of vendors known to be inactive, and absence from it means only that the page has no record of the vendor closing. It is not an endorsement, an audit, or a verification of anything. A vendor that is operating still has to be evaluated on its specifications and batch documentation, which is where identity and purity are actually assessed.

This is the same discipline that applies across Amino Axiom. Each page covers one dimension of the sourcing question: the directory for who vendors are, the price tables for what they list, the tracker for who has stopped. None of them replaces reading the documentation for a specific lot.

What about modified compounds such as PEG-MGF?

PEG-MGF is a case where continuity of source matters because the material is hard to describe by name alone. The Amino Kinetics catalog lists a core peptide molecular weight of 2867.2 g/mol with the formula C121H200N42O39 and CAS number 108174-48-7, and notes that the effective mass varies with the PEG chain. Two suppliers can sell something called PEG-MGF with different PEG components. If a lab's original supplier has closed, the lab cannot assume a new supplier's material is equivalent. The tracker flags that the original source is gone, and the work of establishing equivalence, by comparing specifications and documentation, begins from there.

How often is it worth checking?

When starting a new series of experiments, when reordering material for an existing one, and when auditing supplier records for a methods section or internal review. Because the page reflects the current state of the market rather than a fixed archive, a researcher who needs to document the date of a check should note it, for example "checked October 2026". A lab maintaining 3 or more compound sources, such as the 3 catalog compounds used here, may find a dated entry per source the simplest record. The enforcement timeline is the most useful part for reconstructing why a supplier disappeared, and it is the part most likely to be cited in a lab's own sourcing notes.

Where do the Amino Kinetics listings fit?

Amino Kinetics supplies growth-factor and receptor-binding materials in lyophilized form with analytical documentation available for each batch. Specifications for the compounds discussed are on their product pages, and the full research catalog is at all compounds. For background on the protein itself, see the follistatin and activin signaling overview, and for reading lot documentation, the analytical standards and sourcing guide. Researchers should compare any supplier's listing, this one included, against the compound library entry and the batch documentation.

This article is provided for research and informational purposes only. The compounds discussed are research chemicals intended for laboratory use only. They are not drugs, supplements, or food, and are not intended to diagnose, treat, cure, or prevent any disease. Amino Kinetics does not sell products intended for human or animal use. Amino Axiom is an independent information platform, and its content does not constitute guidance on the use of any material. Researchers are responsible for compliance with all applicable local, state, and federal regulations governing the purchase and use of research materials.