In a new GeroScience study, 22-month-old mice given nicotinamide riboside (NR) for eight weeks did better on memory and nest-building tests. Their brain immune cells also looked more like those of young mice. This was a mouse study, and it does not show the same benefits in people. The dose was 400 mg/kg, far above what humans take, and the abstract reports only male mice. Here is what changed in the microglia, what the study can't tell us, and what the findings mean for NR users.
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