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Participants showed improvements in multiple aging markers, including oxidative stress, mitochondrial function, muscle strength, and even walking speed

Visceral fat is also notoriously stubborn

Zagon IS, Mclaughlin PJ (2017) Endogenous opioids in the etiology and treatment of multiple sclerosis

PMID: 19106640

However, in another study reporting administration of NR or the CD38 inhibitor GSK987A to mdx mice for 20 weeks 267 , treated mice with the CD38 inhibitor showed increased NAD + levels in muscle tissue, but no improvement was found in muscle function after treatment with either the inhibitor or with NR

M., Cingolani, O