We've got these on hand right now, shippng out in about 3-5 business days as long as the dry ice setup for the cold chain doesn't cause a delay—different carriers handle it differently, but we usually have stock for the vials, so confirm lead time if you're ordering more than 50 units or so.
The purity runs above 99% on the HPLC COA we provide with every batch, which for mitochondrial research or NAD+ depletion studies is pretty much where you need to be—anything below that and you'd start seeing background noise in your assays, not great.
Actually, most buyers go with the 500mg vial for standdard anti-aging work, but the 1000mg option is better suited if you're planning bulk repeat dosing across multiple experimental groups, and the powder dissolves fully in water, so there's no residue to worry about when reconstituting.
One thing you might not think to ask: teh glass vials are sterile and individually sealed, though we do store them at -20°C, so let them warm to room temp before opening to avoid condensation pulling moisture into the lyophilized cake.
It's not designed for anything beyond lab research, so don't use it in any cell therapy or human appliction.