One of those he cited to have played an important role in this had been Lefkovits (Jerne, 1984)
The evolution of free radicals and oxidative stress
Tang LJ, Luo XJ, Tu H, Chen H, Xiong XM, Li NS, et al
Yet, you may be unsure if you need extra glutamine from supplements for optimal health

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We emphasize that information about dosing protocols does not constitute medical advice or recommendation for self-treatment