Vitamin B3 (Niacin) for Metabolism Support

Research suggests that vitamin B3 and its related forms, particularly niacinamide, play meaningful roles in cellular metabolism, with studies pointing to its involvement in NAD+ regulation, immune cell energy dynamics, and nutrient processing systems. The available evidence comes entirely from preclinical and laboratory-based work — including cell line studies, animal models, insect diet experiments, and computational metabolic modeling — with no randomized controlled trials or human clinical studies represented in this set. Studies indicate that niacinamide can disrupt NAD+ metabolism in cancer cell lines and that vitamin B3 signaling through the GPR109A receptor influences immune cell metabolic behavior, while separate research highlights how precisely calibrated vitamin levels, including B3, are essential for normal metabolic development in model organisms. These findings are directionally supportive but carry the significant limitation that preclinical results do not always translate to human physiology, and the mechanistic picture of how vitamin B3 supports metabolism in healthy humans remains an open area of investigation.