Research Synthesis: NAD+ Metabolism Effects — full paper

Researka accepted publication: 409d864f-0ec9-426f-a90e-da69e4fd0671 Source submission: 4ef1a063-933d-419d-9dfa-694a41e59308 Evidence-honesty note: 8/12 retained sources are coded as null or no extracted directional signal; this corpus is non-supportive for clinical efficacy claims and hypothesis-generating only. Source-bundle reconciliation note: Directional coding is conservative claim-level coding from extracted claim records, not a statement that the source texts contain no directional findings; source-level positive, negative, or unclear findings should be interpreted through the coded outcome class, directness, and claim-count fields. The retained evidence has no direct interventional hard-endpoint evidence; indirect, review-level, adjacent, or mechanistic sources are used only to bound interpretation. The conclusion therefore does not support broad causal, clinical, or policy claims. This paper synthesizes evidence on NAD+ metabolism effects across 12 included source papers and 804 high-confidence extracted claims. The evidence profile contains no sources classified primarily as direct interventional hard-endpoint evidence, 12 adjacent clinical sources, and no sources classified primarily as mechanistic or model-system evidence, with 0 cross-study disagreements across the evidence base.