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If you've been sourcing NAD+ elsewhere for aging studies, you already know teh purity inconsistency issue — we maintain that over 99% threshold every batch, and it's not just a number on paper.
99.1% is what HPLC routinely shows on ours (usually within 0.3% variation), though we keep lyophilized cake nitrogen-blanked right out of the freezer so you don't get that gummy reconstitution problem.
We'll include batch-specific COAs with each order (shelf life is basically 24 months in -20°C, dry and dark — just don't leave it out at room temp for a week or you'll degrade it yourself).
One thing that caught me early in handling this is that even at -20°C, ambient moisture sneaks into poorly sealed vials, so our custom pouches (we do 1g, 5g, or 50g depending on what you're working on) are triple-sealed.
Basically, it's GMP and ISO backed, but what you actually want for cellular energy or mitochondrial function work is tighter tolerances than reagent grade — that's what we are.
