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& van der Spuy, Z

In a survey of nearly 350,000 people published in the Archives of Internal Medicine , abnormal TSH levels spontaneously returned to normal in more than 50% of subjects when the test was repeated at a later date

May help improve attention Some people choose to use L-theanine and caffeine together in order to improve alertness, cognition and attention

[DOI] [PMC free article] [PubMed] [Google Scholar] 12

Nevertheless, considering the double blinded design of the study, a psychological impact should be symmetrically expected in both l-ARG and placebo groups for both the directions of effect

95% CI, 0.27 to 0.26), while heterogeneity remained high for both subgroups (75% and 65%, respectively)