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Cystine and theanine help maintain strong immune systems in athletes

Athletes can easily get sick because intense training decreases resistance to infection. Sixteen long-distance runners took 700 mg of cystine plus 280 mg of theanine or a placebo per day for seven days of pre-training and nine days of training, running 12 and 18 miles per day respectively in these two periods. Although the benefit didn’t last through the full training period, by the end of pre-training, compared to placebo, the cystine/theanine group had far fewer signs of inflammation and much better resistance. Researchers concluded cystine and theanine could help maintain stronger immune-system response during physical stress. 

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