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Similarly, NAD + levels appear reduced in preclinical models of age-associated diseases, including ataxia-telangiectasia (A-T), mitochondrial myopathies, and Alzheimers disease (AD), and disease-matched clinical samples 114,242,243,244,245,246

For example, research by Heinrich et al

adults use dietary supplements

Deficient synthesis of glutathione underlies oxidative stress in aging and can be corrected by dietary cysteine and glycine supplementation

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This was a cell-system endpoint, not a clinical outcome