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Next to pharmacological or NAD + precursor modulators, it is possible to raise NAD + levels through exercise 302,306,307 , however, not all preclinical studies investigating exercise have linked increased NAD + levels to mitochondrial function
Chang, C.-H., Tsai, W.-C., Hsu, Y.-H., & Su Pang, J.-H

Another function is psychological

Homocysteine also shows folate and vitamin B6 levels