NMN vs Iron

for energy / fatigue

Stronger evidence: Iron

Stronger effect: unknown

Safety: No notable interactions recorded for either.

For energy / fatigue, Iron has the stronger evidence grade.

not well studied very-low certainty

not adequately studied for fatigue/energy outcomes in humans

grade A high certainty

reliably reduces fatigue when iron deficiency / IDA is present; no benefit when iron-replete

18–65 mg/day, iron-deficient adults (esp. menstruating women)

sources: PMID:10000007