How a Product Gets Listed at Index Peptides: The Batch Gate

Published 2026-08-25 · Last updated: 2026-08-21 · By: Index Peptides technical team

Nothing appears in the Index Peptides catalogue as verified stock without a batch record behind it. Every listed product has passed a fixed listing gate — a set of documentation requirements checked per batch, not per compound. This page describes that gate as it operates: what a batch must carry before it is listed, and what happens when a batch's documentation is incomplete. The same standard is described on the about page; this is the working detail.

Research use only. Not for human or animal consumption. All materials are supplied for laboratory research use only. This page describes a documentation process and does not describe any use, effect, or outcome of any compound.

The gate, step by step

A batch enters the catalogue only when each of the following is on record:

1. Batch number

Every batch carries a lot number assigned to one production run. That number is the spine of the record: it appears on the supplier documentation, on the certificate, and ultimately on the vial label, so the paper trail and the physical item can be tied together.

2. Supplier documentation

The batch arrives with its supplier documentation — the certificate of analysis produced for that lot. The certificate must be batch-specific: a generic document, or one that cannot be matched to the lot being received, does not pass. What a complete certificate carries is set out in what is a coa peptide.

3. HPLC purity

Purity must be reported against a stated HPLC method, as an area-percent figure with the method named. A percentage without a method is not an interpretable result, so it does not satisfy the gate. What that figure represents is explained in what 99 percent hplc purity means.

4. LC-MS identity

Identity is confirmed separately by mass spectrometry: the measured mass is recorded against the expected molecular weight of the named compound. Purity and identity answer different questions, and the gate requires both, reported as distinct results rather than merged into one figure.

5. Storage condition

Each listing records the physical form and the storage condition for the batch, stated consistently across the certificate, the listing, and the label. Lyophilised storage and handling are covered in store lyophilised research peptides.

6. Limitation notes

Where documentation has limits — a method detail not stated, a line outside a lab's accredited scope, a grouped rather than per-element figure — the listing notes the limitation rather than rounding the record up. A documentation trail that says what it does not cover is worth more than one that implies coverage it does not have.

What happens to an incomplete batch

A batch missing any of the above does not get listed as verified stock. It stays out of the catalogue — not listed with caveats, not listed on request, simply not listed. The gate is binary per batch: the record is complete and the batch is listed, or it is not and the batch is held back. The traceability this produces, from order through lot number to certificate, is described in peptide batch traceability order to coa.

How to check a listed batch yourself

The gate is designed to be auditable from the outside. For any listed product:

1. Take the lot number from the vial label.
2. Request the certificate for that lot via request batch coa by lot number, or use the verification route at /verify.
3. Match the lot number on the certificate character-for-character against the label.
4. Read the purity and identity lines — each should name its method and sit next to its specification.

If any step failed, the listing would not exist. That is the point of the gate.

FAQ

What is the Index Peptides batch gate?

A fixed set of documentation requirements checked per batch before any product is listed: a batch number, supplier documentation, HPLC purity against a stated method, LC-MS identity confirmation, a stated storage condition, and honest limitation notes. A batch that misses any requirement is not listed.

Does Index list products without a batch-specific COA?

No. Every listed product is tied to a batch-specific certificate of analysis for the exact lot being sold. A generic certificate, or one that cannot be matched to the lot, does not pass the gate and the batch is not listed.

What do the purity and identity requirements involve?

Purity must be reported by HPLC against a stated method, as an area-percent figure. Identity must be confirmed separately by LC-MS, recording measured mass against expected molecular weight. The two are reported as distinct results, not merged into a single figure.

What happens when a batch's documentation is incomplete?

The batch is not listed. The gate is binary per batch: the record is complete and the batch enters the catalogue, or it is incomplete and the batch stays out — it is never listed with caveats in place of documentation.

How can I verify a batch I have received?

Take the lot number from the vial label, request the certificate for that lot — via the /verify route or by asking for the batch COA by lot number — and match the two lot numbers character-for-character. The purity and identity lines on the certificate each name their method.

Research use only. Not for human or animal consumption.