Non-peptide compound
The cited work includes mouse experiments. It does not establish the guide’s human dosing, cognitive benefits or longevity outcomes.
Putting a compound in a peptide book does not change its chemical class or confer clinical evidence. Combination claims require their own evaluation.
Sources and proposed-mechanism explanation
NNMT inhibition is proposed to alter metabolism. NNMT methylates nicotinamide; shorthand suggesting direct NAD methylation is inaccurate.