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Nicotinamide riboside is available in tablet or capsule form and is commonly called niagen.
It is available at select health-food stores, on Amazon or through online retailers.
Niagen supplements typically contain just nicotinamide riboside, but some manufacturers combine it with other ingredients like Pterostilbene, which is a polyphenol — an antioxidant that is chemically similar to resveratrol.
Most niagen supplement brands recommend taking 250–300 mg per day, the equivalent of 1–2 capsules per day depending on the brand. *
Nicotinamide Riboside is very unstable by itself, so is combined with Chloride to make it stable. It is sold as NR + C (Chloride).
While the molecular weight of nicotinamide riboside is 255.25 g/mol, that of its chloride salt is 290.70 g/mol. As such, 100 mg of nicotinamide riboside chloride provides 88 mg of nicotinamide riboside. *
