l-theanine: what the research says about the green tea amino acid

you might have seen l-theanine listed in the ingredients of your favorite sleep gummies, so what's it doing in our social tonics? the short answer: it's one of the most-studied functional ingredients out there, and there's a reason it shows up in everything from focus supplements to relaxation aids.

so, what is l-theanine?

l-theanine is a naturally-occurring amino acid found primarily in green tea leaves. it's decaffeinated, plant-derived, and has been studied for decades for its effects on the brain and nervous system. researchers often classify it as a nootropic – a category of compounds examined for their potential cognitive effects.

what the research has examined

here's what l-theanine has been studied for:

• mood and relaxation. research has examined l-theanine's effects on alpha brain wave activity, which is associated with calm, alert states of mind.
• focus and attention. studies have explored its potential role in supporting cognitive performance, particularly in combination with caffeine.
• sleep quality. research has investigated its effects on relaxation prior to sleep.
• immune function. studies have explored l-theanine's potential role in supporting immune response.

individual experiences vary based on factors like dosage, ingredient quality, personal biochemistry, and consistency of use.

why l-theanine is in hiyo

we built hiyo to be a non-alcoholic option made with ingredients that have been studied for their effects on mood, relaxation, and focus. l-theanine is one of those ingredients – alongside the rest of our functional blend, it's part of why hiyo offers something different from a sparkling water or an alcohol-removed beverage.

we focus on what we can stand behind: clean sourcing, meaningful doses, and ingredients with a research foundation.

the takeaway

l-theanine is a well-studied amino acid found naturally in green tea, examined in research for its potential effects on mood, focus, sleep, and immune function. it's one of the functional ingredients in every can of hiyo.