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L-Theanine Facts

Loose theanine powder, a natural source of the calming amino acid L-theanine

L-Theanine Facts

L-Theanine is a naturally occurring amino acid found predominantly in tea leaves, known for its calming effect on the nervous system. It works through glutamatergic signaling and alpha-band brain activity — supporting the same alpha-wave patterns associated with relaxation — while also influencing neurotransmitters like GABA, serotonin, and dopamine to help support a balanced mood. Because of this, it's uniquely suited both as a complement to caffeine (helping support a steadier sense of calm alertness) and as a standalone aid for winding down.*

Key Benefits of L-Theanine:

Supports relaxed alertness, attentional composure, and a calm but focused mental state*
Supports the body's response to stress and helps promote a calm but attentive mental state*
Supports GABA production, a calming neurotransmitter*
Promotes relaxation and a balanced mood*

Why it Matters:

Chronic mental strain is increasingly common — more than 75% of adults report experiencing stress that impacts their daily life¹. Daily demands, screen time, constant multitasking, and lack of downtime can keep the nervous system in a heightened state of alert. L-Theanine offers gentle support by encouraging the brain to shift into a more relaxed rhythm, especially during periods of occasional stress or overstimulation. Paired with caffeine, it has been shown to support calm, productive focus without the jitters or crash²⁻⁴.*

Citations:

American Psychological Association (APA). Stress in America 2022. Published 2022. https://www.apa.org/news/press/releases/stress
Rogers PJ, Smith JE, Heatherley SV, Pleydell-Pearce CW. Time for tea: mood, blood pressure and cognitive performance effects of caffeine and L-theanine administered alone and together. Psychopharmacology (Berl). 2008;195(4):569-577.
Giesbrecht T, Rycroft JA, Rowson MJ, De Bruin EA. The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness. Nutr Neurosci. 2010;13(6):283-290.
Yoto A, Motoki M, Murao S, Yokogoshi H. Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. J Physiol Anthropol. 2012;31(1):28.

Products Included

LIMITED TIME

AG1 Energy+ (14ct)

The AG1 Next Gen foundation with 100mg plant-based caffeine and 100mg L-theanine added for extra energy and focus.*

$49

1 flavor

AGZ Nightly Sleep Support (30ct)

Ease your mind & body into restful sleep with key clinically-studied calming herbs, magnesium & adaptogens.*

From $79$99^†

2 flavors

^† Value of one-time purchase

Home
Ingredients
L-Theanine Facts

L-Theanine Facts

L-Theanine is a naturally occurring amino acid found predominantly in tea leaves, known for its calming effect on the nervous system. It works through glutamatergic signaling and alpha-band brain activity — supporting the same alpha-wave patterns associated with relaxation — while also influencing neurotransmitters like GABA, serotonin, and dopamine to help support a balanced mood. Because of this, it's uniquely suited both as a complement to caffeine (helping support a steadier sense of calm alertness) and as a standalone aid for winding down.*

Key Benefits of L-Theanine:

Supports relaxed alertness, attentional composure, and a calm but focused mental state*
Supports the body's response to stress and helps promote a calm but attentive mental state*
Supports GABA production, a calming neurotransmitter*
Promotes relaxation and a balanced mood*

Why it Matters:

Citations:

American Psychological Association (APA). Stress in America 2022. Published 2022. https://www.apa.org/news/press/releases/stress
Rogers PJ, Smith JE, Heatherley SV, Pleydell-Pearce CW. Time for tea: mood, blood pressure and cognitive performance effects of caffeine and L-theanine administered alone and together. Psychopharmacology (Berl). 2008;195(4):569-577.
Giesbrecht T, Rycroft JA, Rowson MJ, De Bruin EA. The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness. Nutr Neurosci. 2010;13(6):283-290.
Yoto A, Motoki M, Murao S, Yokogoshi H. Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses. J Physiol Anthropol. 2012;31(1):28.