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Nicotinamide riboside, or NR, is another precursor in NAD+ metabolism.

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It is distinct from NMN and from directly administering NAD+ itself.

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A randomized crossover trial in healthy middle-aged and older adults compared NR with placebo over two

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six-week periods. Researchers assessed tolerability and NAD+ metabolism.

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NR increased NAD+ in blood cells in this study.

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That is evidence of a biological response, not direct proof of longer life or better memory.

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Exploratory cardiovascular findings need further testing.

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Small, short trials cannot establish broad anti-aging benefits or fully characterize uncommon risks from

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long-term use.