That was a good threadAlways trying to start trouble lol. I totally forgot about that back and forth! Basically, you need NADPH to make NO. NADPH is different than NADH. The dude was trying to sell NADH as this ultimate NO producer and kept quoting some paper that I still have yet to see! He did find a powerpoint slide that I'm sure he didn't make himself *cough cough*. Anyway, I didn't catch that NADH was in the product you listed. It won't hurt anything, but it makes no sense to put it in there and if they think it is such a good ingredient, then why add arginine as well? Just makes me question everything else they do.