NMN and nicotinamide riboside
Food or supplementMeasured in people, not heightBy mouthNutrient
Two supplements that top up NAD⁺, the fuel the sirtuin enzymes burn.
Two precursors that feed the NAD⁺ salvage pathway, sold as supplements. Nicotinamide riboside is converted to NMN first, and both end as NAD⁺, the molecule sirtuins consume every time they work.
Risks. Tolerated in short adult trials, and that is all that is known. No safety data in children, none long-term, and some trials were funded by the companies selling them.
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Educational content, not medical advice. Nothing here is a recommendation to take or stop taking anything — talk to a doctor about your own situation.