300mg is a sufficient daily serving. A serving size of 300mg Niagen® per day is supported by multiple published human clinical studies. This serving size is clinically shown to increase nicotinamide adenine dinucleotide (NAD⁺) levels in people and maintain those elevated NAD⁺ levels with continued daily use. That is why we believe this is an appropriate serving size for people to consume to obtain the benefits from an increase in NAD⁺. Importantly, our new dietary ingredient notification to the FDA supports that 300mg per day is safe for use.
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