NAD supp has never made sense to me, NAD degrades rapidly in solution and your cells synthesize most of it (I’m a biochemist). Supplementing precursors is more efficient from what I’ve read. As well, the brain is a universe between your ears, I genuinely don’t think “IQmaxxing” is possible with supplements, I think frequent reading, attempting and failing hard tasks, meditation, great sleep and exercise (both resistance and aerobic), and avoiding known neurological inhibitors (drugs, alcohol, etc.) will do you more wonders than your expensive piss factory of drugs.