
Reductive Stress: How Cellular Fuel Overload Drives Insulin Resistance
When cells are flooded with excess glucose, accumulated NADH creates reductive stress that impairs mitochondrial function and blocks insulin signaling.
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When cells are flooded with excess glucose, accumulated NADH creates reductive stress that impairs mitochondrial function and blocks insulin signaling.

NAD+ genuinely declines with age and genuinely matters. Whether swallowing a precursor changes anything you would notice is a separate and much less settled question.