NutriStack
NMN and Vitamin B3, a caution.
Both are NAD+ precursors through different pathways. Taking both may be redundant and could lead to excessive NAD+ precursor supplementation.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- NMN and Vitamin B3
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 1 source
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. Both are NAD+ precursors through different pathways. Taking both may be redundant and could lead to excessive NAD+ precursor supplementation.
Mechanism. Niacin (B3) → NAD+ via the Preiss-Handler pathway. NMN → NAD+ via the salvage pathway (NMNAT). Both raise NAD+ but through different enzymatic routes. Redundant at typical supplement doses.
Recommendation. Choose one NAD+ precursor strategy. NMN is generally preferred for direct NAD+ boosting via the salvage pathway.
Sources (1)
- Rajman L et al. Therapeutic potential of NAD-boosting molecules. Cell Metab. 2018
Stack Score
How this pair moves the number.
Effect on the composite score
If both NMN and Vitamin B3 are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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