Key Takeaways

L-theanine promotes calm alertness that may enhance focus without causing drowsiness.

Pairing caffeine and L-theanine can boost attention and mental clarity while reducing the jittery edge often caused by coffee alone.

The combo is safe for most healthy adults in moderation.

A new “biohacking” trend is circulating online: adding 200 milligrams of L-theanine to your coffee. The combination is supposed to improve focus, offer steady energy, and reduce caffeine crashes. Experts say there's some truth to these claims.

How Does L-Theanine Affect Focus?

L-theanine , an amino acid found in green tea, affects the brain chemicals that promote a state of calm alertness rather than sedation, according to Luke Barr, MD, a board-certified neurologist and chief medical officer at Se

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