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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. While caffeine activates, L-Theanine composes, working through glutamatergic signaling and alpha-band brain activity to promote a calm, attentive mental state. It is uniquely suited as a complement to caffeine, as the ingredient that shapes how that energy feels.*

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*

Why it Matters:

Together, caffeine and L-Theanine form one of the most studied combinations in the cognitive performance space, delivering the kind of calm, productive focus you can rely on every morning, without the jitters or crash¹⁻³.*

Citations:

1. 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.
2. 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.
3. 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+: Travel Packs (14ct)

Complements AG1 with added support for brain, heart, and immune health – plus healthy aging and cellular energy.*

$49

1 flavor