In a Canadian research-peptide context, NAD+ sits within the longevity class of reference standards. This post collects what HPLC-verified labs need to know about sourcing, storing, and reproducibly using this material, drawn from public literature. NAD+ is not currently stocked in the Pure North Peptides catalog — the handling notes below apply to verified reference material from any qualified supplier.
Why NAD+ matters
NAD+ is a central redox cofactor that underpins the sirtuin family and more than 500 enzymatic reactions, which is why it is a recurring tool in metabolic- and aging-research models in vitro. For labs sourcing it as a reference material, the reproducibility gap on most catalogs comes from one place: lots that don't hit ≥ 99% HPLC purity get sold at lower price points instead of being rejected. Pure North's published purity floor is 99.0%, with the average across the catalog at 99.18%. Every lot we ship has a Janoshik-Analytical-verified COA archived publicly at /lab-results/ from synthesis onwards.
The protocol short-version
For Canadian research labs working with NAD+, the lifecycle is: on receiving the vial, transfer it immediately to a research-grade −20 °C freezer, reconstitute in sterile bacteriostatic water at the working concentration your protocol specifies, and use within the storage window noted on the lot's COA. Avoid repeated freeze-thaw cycles — every cycle introduces measurable assay drift even on lots that meet the purity floor.
Cross-batch reproducibility
Pure North holds a 5-year retain sample on every lot. If your assay drifts, we run our retain against your in-hand material and pinpoint whether the variance is in the peptide or upstream in your reagent pipeline. This is the most-requested feature labs cite when asked why they reorder.
Sourcing in Canada
NAD+ is not currently stocked by Pure North Peptides. For the reference standards we do carry, Pure North is Canadian-based and ships across Canada via Canada Post Xpresspost — orders are dispatched within 2 business days, with typical transit around 4 days. Free shipping over $250 CAD; flat $25 below that. Browse the current catalog at /products/. Read more on storage and handling in our storage guide, our shipping policy, lot verification at /coa-verify/, or the public lot archive at /lab-results/.