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$125.99 14-day risk-free guarantee · Free US shipping on orders $250+ COA / Batch Lookup Search certificates of analysis by batch number Get Started → Dosage — 1000mg selected Subscribe & Save Most Popular Buy 2 Save 5% $119.69 each Best Value Buy 3+ Save 10% $113.39 each Subscribe & Save Discounted per-vial pricing | No hidden fees 14-day risk-free guarantee · Secure checkout Research Use Only — Not for Human Consumption NAD+ is one of the most studied coenzymes in longevity and metabolic research: Essential cofactor for sirtuin deacylases (SIRT1–7) — regulators of gene expression, metabolism, and aging in preclinical models Required substrate for PARP enzymes involved in DNA strand break repair in cell culture studies Supports mitochondrial biogenesis via PGC-1α activation in rodent models Circulating NAD+ levels decline ~50% between ages 40–60 in human observational studies IV and systemic NAD+ studied for neuroprotection, addiction, and metabolic syndrome in clinical research Every batch is independently tested by a US-based third-party laboratory