G protein-coupled estrogen receptor activation by bisphenol-a disrupts lipid metabolism and induces ferroptosis in the liver
However, much of the research has illustrated that such an effect is a negation of caffeines ability to raise blood pressure rather than an ability of L-theanine to take a persons blood pressure down below its normal resting state.26 Also, in some research looking at L-theanine in isolation (or, more specifically, in mango sorbet), no effect on blood pressure was observed.27 It appears that L-theanine should be mostly safe for most people, but its always a good idea to talk to your doctor before introducing any new supplement into your regimen
[DOI] [PubMed] [Google Scholar] Zhang X., Gu T., Liu Y., Liu C., Lin Y., Li H., et al
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