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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1978 1
1980 2
1986 1
1995 1
1996 2
1997 1
1998 5
1999 5
2000 6
2001 2
2002 5
2003 4
2004 8
2005 6
2006 10
2007 17
2008 21
2009 12
2010 19
2011 25
2012 32
2013 18
2014 18
2015 24
2016 32
2017 36
2018 36
2019 45
2020 59
2021 51
2022 40
2023 39
2024 28

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Page 1
L-Theanine and Immunity: A Review.
Chen S, Kang J, Zhu H, Wang K, Han Z, Wang L, Liu J, Wu Y, He P, Tu Y, Li B. Chen S, et al. Molecules. 2023 May 1;28(9):3846. doi: 10.3390/molecules28093846. Molecules. 2023. PMID: 37175254 Free PMC article. Review.
521 results