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E., Hestrin, S., & Armstrong, W
(2024) 19:e0309893

Wen Y, Li L, Deng Z
The level of L-theanine in the tea represents 1 to 3% of the dry tea, and that level varies depending on many factors such as the geographic region in which the tea is grown, conditions of cultivation, variety of tea, time and harvest type, and so on (Vuong et al., 2011)

The substance which loses an electron is said to have been oxidized
It has been proposed that oxidative stress-related diseases can be cured by the enhanced supply of antioxidants