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Because L-theanine tends to promote relaxation, while caffeine promotes alertness, the two have opposite but complementary effects

The review was conducted under the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines, where applicable, to ensure transparency and reproducibility

doi: 10.1016/j.nut.2016.12.018 [DOI] [PubMed] [Google Scholar] 10.Bachhawat AK, Yadav S

Ramchal, H

It can be found naturally in a variety of foods such as fruits, beans, grains, and nuts

Effects of serum vitamin B12 and folate status on episodic memory performance in very old age: a population-based study