Nowadays, people's need for beauty to prevent aging is growing. However, some people still do not fully understand what nutrients are needed to prevent aging.

Sleep deprivation is associated with an increased risk of various chronic diseases such as depression, obesity, cardiovascular disease, diabetes, and leads to reduced quality of life and negative socioeconomic consequences. Substances that can induce sleep, such as drugs and herbs, can often lead to dependence and other side effects. Meanwhile, L-theanine (γ-glutamylethylamide), a natural amino acid found abundantly in tea leaves, has anxiolytic effects through the generation of α brain waves without the addiction and other side effects associated with conventional sleep induction.

L-theanine is a naturally occurring compound found in green and black tea, and it is also available in supplement form. Research suggests that L-theanine may provide a range of health benefits, including improved mental focus and better sleep quality. This article provides an overview of L-theanine, including its health benefits, potential risks, and dosage.