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Gamma-glutamylcysteine synthetase in erythrocytes and/or cultured fibroblasts can be measured as described elsewhere [1]

Since these studies have been undertaken over short durations, we cannot be certain whether the benefits are sustained

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J Comp Neurol 191(4):661702

Key gaps to address: dose-response in humans, safety/tolerability profiles across populations, interaction effects in stacks, and long-term cardiometabolic outcomes