Sourcing transparency

Structure

The chain

Material reaches a customer through a sequence of custody transfers, each of which either has a record or does not. Where a transfer has no record it is an untraceable interval, and no amount of documentation at the other links compensates for it.

Custody transfers, in order

Link: Synthesis

The manufacturer's batch record and the lot identifier assigned at production. We do not receive the batch record and do not claim to hold it: a distributor of finished vials is downstream of it. What we require in writing with every shipment is the producer's lot code and the country of synthesis, which is what keys our lot to one production event.

Link: Purification and drying

Purification route and the resulting salt form, which sets the counterion and therefore the mass of non-peptide solid in the vial. The salt form is a purchase condition we require in writing. The purification route is usually held as process know-how, and where it is not disclosed we say so rather than infer it.

Link: Analysis

The named laboratory, the date, the methods, and the sample identity the laboratory was given, all printed on the laboratory's own report.

Link: Import and receipt

Receipt date, condition on arrival, and the storage condition the material entered.

Link: Fulfillment

The lot that physically ships, written back to the order at packing so the lot record the customer reads is the record for the vial they hold.

Disclosure

What we publish

These are the fields we publish, openly rather than on request. A document available only on request can be selected per inquiry, which makes it evidence about our sales process rather than about the material. The analytical fields are the laboratory’s own, printed on the report we link from each product page.

What we disclose

Field: Lot identifier

yes

Printed as text on the page and on the vial label, so both ends can be matched

Field: Testing laboratory

yes

Named on every report we link, and the report opens at the laboratory with its own key. An unnamed laboratory cannot be checked and is not a disclosure

Field: Test date

yes

As dated on the laboratory's report. Fixes the result in time relative to manufacture

Field: Methods per assay

yes

As stated on the laboratory's report. Results are not comparable between vendors without them

Field: Country of synthesis

required of the supplier

A basic provenance fact that the category treats as confidential for no defensible reason. It is a written condition of purchase, not something we can measure, so we publish the declaration where it is given

Field: Salt form

required of the supplier

Varies between suppliers of nominally identical material and changes the molar quantity obtained from a given weight. Also a written condition of purchase, published on the same terms

Field: Purification route

where disclosed

Requested, frequently withheld as process know-how. We publish it when it is given and leave it absent when it is not, rather than describing a route we were not told

Field: Manufacturer identity

no

Commercially confidential. We state this openly rather than implying vertical integration we do not have

Three of these fields are facts only the producer holds, so they are written into the purchase order as conditions of supply rather than presented here as things we can establish. A supplier who will not commit to them in writing is a qualification finding, and it leaves two honest outcomes: buy elsewhere, or publish the field as undisclosed. Printing a figure we were never given is not among them, and neither is leaving the row silently blank.

Independence

What third-party testing means

“Third-party tested” is used loosely enough to be nearly empty. It can mean an independent laboratory selected and paid by the distributor, a report supplied by the manufacturer and passed through unverified, or a certificate produced by a laboratory affiliated with the manufacturer. All three are written the same way on a product page.

The distinctions that carry information are whether the laboratory is named, who drew and submitted the sample, and whether the laboratory has any relationship with the manufacturer. A manufacturer-supplied certificate is not worthless, but it is evidence with an interested party in the chain, and it should be labeled as such rather than presented as independent verification.

Ours meet the test that matters. Every report we publish is issued by a named independent laboratory, independent of the manufacturer, and opens at that laboratory with its own key, so anyone can confirm it is genuine and unaltered without taking our word for it. The supplier commissions the analysis on its material; we publish the report exactly as the laboratory issued it.

Limits

The sample problem

A certificate reports measurements on a sample, and the sample stands for the lot only if it was drawn representatively. For a homogeneous lyophilized powder that assumption is usually sound, and it is an assumption rather than a measurement.

It is also the reason an independent re-test by a customer can legitimately disagree with a published figure within a few tenths of a percent without either result being wrong. Sampling, method differences, instrument calibration and time since manufacture all contribute. A difference of several percent is a different matter and is worth raising with us.

Neither disclosure nor testing establishes anything about material after it leaves our custody. What happens in transit and storage is the part of the chain that continues after the last measurement, and degradation does not wait for documentation.

Supply

Scope

Disclosure of sourcing and testing is a statement about the composition and provenance of a material. It is not a statement about suitability for any application, and it does not change what these materials are supplied for.