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Theanine
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'''Theanine''' or '''L-theanine,''' also known as '''boletus badius''', '''camellia sinensis''', '''gamma-ethylamino-L-glutamic acid''' or '''suntheanine''', is an amino acid found in [[green tea]] that is sometimes taken as a herbal or alternative medicine.<ref name="msk">{{Cite web|url=https://www.mskcc.org/cancer-care/integrative-medicine/herbs/l-theanine | title = L-Theanine | last = | first = | authorlink = | date = |website=Memorial Sloan Kettering Cancer Center|language=en|archive-url=|archive-date=|url-status=|access-date=2020-09-28}}</ref><ref name=":0">{{Cite web|url=https://www.drugs.com/npp/l-theanine.html | title = L-Theanine Uses, Benefits & Dosage - Drugs.com Herbal Database|website=Drugs.com|language=en|access-date=2020-09-28}}</ref> ==Uses== Theanine is has suggested for: *[[Anxiety]]<ref name=":0" /> *[[Brain fog]] symptoms (cognitive impairment), e.g. to improve concentration mental alertness, and memory, particularly in combination with [[Green tea|green tea extract]] or [[caffeine]]<ref name=":0" /><ref>{{Cite journal | last =Park | first = Sang-Ki | authorlink = | last2 = Jung | first2 = In-Chul | authorlink2 = | last3 = Lee | first3 = Won Kyung | author-link3 = | last4 = Lee | first4 = Young Sun | authorlink4 = | last5 = Park | first5 = Hyoung Kook | authorlink5 = | last6 = Go | first6 = Hyo Jin | authorlink6 = | last7 = Kim | first7 = Kiseong | last8 = Lim | first8 = Nam Kyoo | last9 = Hong | first9 = Jin Tae | date = April 2011 | title = A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled study|url=https://www.ncbi.nlm.nih.gov/pubmed/21303262|journal=Journal of Medicinal Food|volume=14|issue=4|pages=334β343|doi=10.1089/jmf.2009.1374|issn=1557-7600|pmc=|pmid=21303262|access-date=|quote=|via=}}</ref> *Improving response to conventional cancer treatment or reducing cancer treatment side effects<ref name="msk" /> *[[Depression]]<ref name="msk" /> *Immune system support<ref name=":0" /> *[[Insomnia]]<ref name="msk" /> == Dosage == Doses used in short term clinical trials include: * Anxiolytic / anxiety - 200 - 250mg in a single dose * Cognitive performance and mental alertness - 97 - 100mg, taken with caffeine * Psychiatric symptoms - 240 to 400mg daily, in divided doses<ref name=":0" /> ==Risks and side effects== Headache, dizziness and gastrointestinal symptoms have been reported.<ref name=":0" /> ==Availability== Theanine is inexpensive and available over the counter.<ref name="msk" /> ==Evidence== Evidence is limited for most suggested uses and some trials have reported no benefits or mixed results.<ref name="msk" /> ==ME/CFS== ==Learn more== *[https://www.mskcc.org/cancer-care/integrative-medicine/herbs/l-theanine L-theanine] - Memorial Sloan Kettering Cancer Center *[https://www.drugs.com/npp/l-theanine.html L-theanine] - drugs.com ==See also== *[[Green tea]] *[[Caffeine]] *[[Brain fog]] ==References== {{Reflist}} [[Category:Amino acids]] [[Category:Supplements]] [[Category:Potential treatments]] [[Category:Depression alternative treatments]]
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