L-theanine is amino acid found in abundance in tea leaves. In this reading we are discussing research-study backed benefits of L-thianine and correct dosage.

About L-theanine

L-theanine is amino acid found in abundance in tea leaves. It is non-protein and non-essential amino acid. Because it is non-essential, body immune system lowers its priority, therefore taken orally.

Stress Relief

As per 2019 review study, 400mg of L-theanine a day significantly reduced stress and anxiety.

The same study found faster anti-stress effects, within few hours of administration.

Increased Mindfulness & Alertness

This is naturally occurring compound in tea leaf hence it is considered organic. A 2025 research study concluded that drinking tea leads to increased alertness.

Another anti-oxidant organic compound called catechin in tea, also helps to promote alertness.

Further research is required to understand exact pharmacology about how l-theanine relives stress and anxiety.

Better immunity

Another 2016 study suggested that l-theanine helps to relieve upper respiratory tract infection. Also, l-theanine found to promote healthy body immune system. L-thianine 200mg capsules.