The science

The science behind the catalog

Every kit we ship is sourced from a vetted manufacturer, assayed by an independent third-party lab, and tracked by lot number end-to-end. The methodology below is the same whether a researcher buys a single vial or the Longevity Stack.

Sourcing

Lots are sourced from a closed panel of cGMP-aligned synthesis partners. Each manufacturer must produce a manufacturer CoA covering peptide content, water content, and counter-ion (acetate / TFA) declaration. We re-assay every lot independently before it is released to the storefront — a manufacturer CoA alone is not enough to ship.

Assays

Each in-stock lot is independently assayed by mass spectrometry and reversed-phase HPLC. The two-method pairing covers identity (MS) and purity (HPLC integration). Where a lot’s assay disagrees with the manufacturer’s stated value by more than 1.5%, the lot is held for re-test.

Lot tracing

Every vial in every kit carries the lot number printed on the label and reproduced on the kit’s CoA insert. The same lot number ties back to the manufacturer batch, the assay PDF, and the receiving record in our inventory system. If a researcher needs to cross-reference a specific lot’s assay weeks after shipment, the trace lives in the storefront.

Independently assayed

The “Independently assayed” badge across the storefront refers to the third-party assay pairing above. Lab partner logos will appear here as those partnerships ship in v2.