NAD+ or Semax for focus?

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.
 
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