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NAD+-precursor supplementation with L-tryptophan, nicotinic acid, and nicotinamide does not affect mitochondrial function or skeletal muscle function in physically compromised older adults

Each peptide category serves different purposes and works through distinct mechanisms

Both methods bypass the digestive system, but they differ in absorption speed, nutrient scope, and ideal use cases

5-Amino-1MQ alone improved grip strength to a greater degree than rigorous exercise training alone, and combined treatment produced sustained increases in daily running distance that did not taper off in the way exercise-alone groups did, suggesting reduced post-exercise muscle recovery requirement