سلام عليكم، اريد ان استفسر عن المكملات الغذائية في السوق وخاصة ال ثيانين ، هل هناك فعلاً نتائج مثبتة لهذا المكمل ام هو نشاط تجاري فقط ؟

Hi Jo. Thanks for your question. L-Theanine is an amino acid naturally found in green and black tea. The idea behind it is that it may help the brain enter a state of calm without causing the intense drowsiness associated with sedatives. Some small studies have shown improvements in stress, sleep, and attention; a clinical study involving adults with stress-related symptoms found improvements in sleep, mood, and cognitive markers after using it.

However, a broader review of the evidence reveals that studies are often small, short-term, and of varying quality. A systematic review published in 2024 found positive indications regarding certain mental health conditions—such as anxiety, ADHD, and schizophrenia—but emphasized the limited number of studies and the need for more robust research before it can be considered an established treatment.

In short, L-Theanine is not a scam, though marketing claims surrounding it are often exaggerated. It is a reasonable supplement to try if you experience mild stress or sleep disruption due to minor anxiety—provided you expect limited benefits rather than a radical cure. Most importantly, do not pay a premium price for a product simply because of bold claims; instead, choose a reliable product that has undergone third-party testing whenever possible.