NAD+ or Semax for focus?

Semax is more cognitive (BDNF pathway); NAD+ is energy baseline. Both layer well for focus and study.

Heavy metals alongside purity is the right combination for Semax - CNS activity makes contamination risk higher than with peripherally-acting peptides. Batch quality variation explains most of the inconsistent cognitive response people report.

NMNH helping with Tirz fatigue is consistent with what others report - the mitochondrial energy pathway that NAD+ supports can get depleted when you're in a caloric deficit. The cheapest NAD precursor tends to work the same as the expensive versions for most people. Worth trying if the fatigue is limiting your activity.

Semax for brain fog and cognitive fatigue is one of the more interesting peptides in that space. The intranasal route is a bit unusual if you're only used to Flonase but the actual dosing is much smaller. The brain fog and fatigue piece is the area where people report the most noticeable difference - what's the source of it for you?