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In another study, long-term administration of NAM prevented disease related to a high-fat diet, promoting healthspan, but it did not have significant effects on lifespan 200

Insulin sensitivity and glucose handling

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On the other hand, another study found no effect of 2000 mg NR per day supplementation in obese or overweight men on NAD + metabolite or mitochondria in skeletal muscle, although muscle NAMPT levels were decreased 316