NR-form® 300 300 mg nicotinamide riboside NR-form® 300 is our recommendation if you wish to take pure nicotinamide riboside, for example, to supplement Age-in-form® Longevity or Age-in-form® Longevity complete. This scientifically formulated product offers exceptional purity with at least 98% nicotinamide riboside chloride. Special features Nicotinamide riboside as a special precursor of NAD+ Particularly high purity: at least 98% nicotinamide riboside chloride Suitable for vegetarians and vegans