GNC Preventive Nutrition® Nmn: Β-Nicotinamide Mononucleotide Supports Production Of Nad , Which Helps With Dna Repair. Nmn Can Be Naturally Converted To Nad In The Body. Contains 150 Mg Nmn Per Capsule 60 Capsules 60 Day Supply | GNC Preventive Nutrition Nmn Β-Nicotinamide Mononucleotide - 60 Capsules (60 Servings)