Effects of (L)-cystine and (L)-theanine supplementation on the common cold: a randomized, double-blind, and placebo-controlled trial.

J Amino Acids · 2010 · PMC3275984 · PMID 22331996

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a decreasing trendno p-value reported

For individual symptoms of the common cold, significant reductions in febrile symptoms (chills and fever) were observed due to CT ingestion as well as a decreasing trend in the incidence of other predominant symptoms, for example, runny nose, sore throat, and joint pain.

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