By BioLabs Research · Last reviewed: October 10, 2026
This storefront lists a fixed set of research reagents. A name that circulates in the wider research literature is not automatically a SKU here. The identity notes on this blog exist so purchasing teams can tell catalog listings apart from analogues we do not stock, before a purchase order is cut and before a lot is booked into a laboratory information system.
The storefront rule
We publish a product listing only when we can support it with named identity fields (sequence or structure, and registry numbers where they apply) and lot documentation on request. An analogue can be well known in public databases and still be absent from the catalog. A blog identity note about a compound does not mean that compound is for sale.
Listings also change with stock. A product page that is temporarily inactive sends visitors back to the catalog instead of showing a product card. The catalog itself is the current list.
Names that collide with listed reagents
The most common collisions come from analogues whose names sit close to a listed reagent:
- Melanotan II. A cyclic α-MSH analogue, listed in PubChem as CID 92432 (C50H69N15O9, CAS 121062-08-6). It is not listed here, and it is not the same as KPV, which is the α-MSH 11–13 tripeptide. See Melanotan II identity and KPV is α-MSH 11–13.
- CJC-1295 with and without DAC. Two different backbones with different formulae and masses. PubChem lists the DAC form as CID 91971820 (C165H269N47O46). Neither form is a catalog SKU here. See CJC-1295 identity and DAC vs no-DAC.
- TB-500 vs thymosin β4. The TB-500 listing is the Ac-LKKTETQ fragment (PubChem CID 62707662, about 889 Da), not the 43-residue protein. See TB-500 vs thymosin β4.
- AOD-9604 vs other growth hormone fragments. The AOD-9604 listing is a specific 16-residue sequence; "176–191" and "177–191" labels can describe different peptides. See AOD-9604 vs hGH 177–191.
- Named blends. A blend is two or more substances with no single CAS number of its own. See One vial, two CAS numbers and ECM-70 is a named catalog blend.
Comparison table (checked 8 Oct 2026)
| Name buyers see | Active listing here? | What to verify |
|---|---|---|
| Melanotan II | No | Do not map it onto any listed α-MSH-derived reagent |
| KPV | Not active right now | α-MSH 11–13 identity on the lot paper |
| CJC-1295 (DAC or no DAC) | No | Formula and observed mass for the exact backbone |
| AOD-9604 | Yes | Sequence YLRIVQCRSVEGSCGF and disulfide-form mass |
| TB-500 | Yes (fragment) | Ac-LKKTETQ and a mass near 889 Da, not full-length Tβ4 |
What to put on the PO and the COA
If you need a listed reagent, match the product page's sequence and registry fields to the lot documents. Prefer the certificate's sequence and observed mass over any nickname. When a PO uses a name that can mean two formulae, require the certificate to print the formula (or sequence plus modifications) and the observed mass before the lot is received.
Purchase-order hygiene for mixed nickname environments
Multi-site labs often share a master item dictionary that grew from several vendors' quotes. That dictionary is where analogues slip in as if they were interchangeable with listed SKUs. Before approving a blanket PO, export every peptide-like line and mark each row as listed here, identity note only or unknown. Unknown rows need a sequence or registry number before the PO is released.
When a requester pastes a literature name into the order notes, ask which public record they mean. A PubChem CID or CAS number in the PO comment field stops most collisions. If they cannot produce one, the order is not ready to be received against a catalog SKU.
Re-audit the item dictionary whenever the catalog changes. The risk is rarely the size of the catalog. It is the pull of old nicknames from earlier quotes and shared spreadsheets.
When a listing goes inactive
A listing can go inactive because of stock, not because anything about the molecule changed. If your lab already holds lots of a reagent whose listing is currently inactive, keep those lots under their existing inventory record and keep their certificates on file. Do not re-map them to a different listed SKU with a similar name. When the listing returns, check that the new lot's sequence and expected mass match the old record before merging anything, and open a new lot entry rather than overwriting the old one.
Reading the certificate for a listed reagent
The certificate is where a nickname becomes an identity. Check the sequence line and the expected mass first, then the observed mass, then purity. Our guide on how to read lot documents explains each field, and the COA library shows complete certificates for catalog listings.
Next step: For scope questions, contact the desk with the public record (CID or CAS) of the compound your protocol names.
Related reading
References
- PubChem Compound Summary, CID 92432 (Melanotan II): C50H69N15O9, MW 1024.2, CAS 121062-08-6. https://pubchem.ncbi.nlm.nih.gov/compound/92432
- PubChem Compound Summary, CID 91971820 ("CJC-1295"): C165H269N47O46, MW 3647.2. https://pubchem.ncbi.nlm.nih.gov/compound/91971820
- PubChem Compound Summary, CID 62707662 (Ac-LKKTETQ): C38H68N10O14, MW 889.0. https://pubchem.ncbi.nlm.nih.gov/compound/62707662
- PubChem Compound Summary, CID 71300630 (AOD-9604): YLRIVQCRSVEGSCGF, C78H123N23O23S2, MW 1815.1. https://pubchem.ncbi.nlm.nih.gov/compound/71300630
For research use only. Not for human or veterinary use.