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Most are animal sources (milk, egg yolks, yogurt, salmon, tuna, beef) which is why vegetarians and vegans have a higher risk of being deficient (3)
Wang, F., Mullican, S
Notably, low GSH plasma levels have been identified along with three other clinical indicators (age, CD3 ratio, and total protein) as a predictor of the severe/critical symptoms of COVID-19 infected patients (Sun et al., 2020)
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