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One Per Day Dietary SupplementNSF Certified SportHalalKosherTru Niagen 300mg is our most versatile serving size—one capsule daily can increase your blood NAD+ levels by up to 51% in as little as two weeks and keep them elevated over time with ongoing supplementation. You can also take more than one capsule daily to increase your NAD+ levels even further depending on your budget and how you feel after starting with 300mg.