Look, if you're sourcing NAD+ and getting inconsistent purity or sketchy COAs, we've been dealing with that exact headache for years — it's why most buyers switch to us.

What we're running is ≥99% pure white powder, pharmaceutical grade, stored at 2-8°C in a dry place, with a 24-month shelf life (usually 2-4 weeks lead time on standerd orders).

The HPLC data is solid, and it's better than reagent grade for this — tighter tolerance on residual solvents, which matters if you're doing sensitive work. We don't recommend it for cell culture without your own validation though.
MOQ is 1g if you want a sample, but we've done foil bags or vials depending on what you need — private labeling is avaliable for qualified clients, and our company can tweak particle size if your formulation calls for it.

REACH compliant, so no customs headaches in EU, and we usually have stock on teh 10g or 50g sizes — but confirm lead time if you need over 100 units or so.

Anyway, that's the gist.