Caffeine & L-Theanine Nootropic Stack for Cognitive Function and Energy

Caffeine & L-Theanine Best Natural Nootropic Stack

Nootropics, or smart drugs, are known to improve working memory, increase motivation, and enhance focus.

L-Theanine, a non-dietary amino acid that has been shown to reduce stress and increase energy levels, have been in Chinese medicine for thousands of years and is backed by extensive scientific and clinical studies. It is commonly found in green tea (Camellia sinensis) along with caffeine. Together, they work to increase one’s level of alertness while also reducing anxiety and nervousness levels. Taking caffeine on its own produces unwanted effects such as jitters and hyperactivity.

This potent combination of L-Theanine and caffeine are known to promote relaxation without feeling sedated. It reduces the feeling of stress and anxiety. Shown to slightly increase attention span and focus, it also helps improve sleep quality.

What exactly is L-Theanine?

L-Theanine is a natural amino acid that is used as a psychoactive agent. It interferes with neuroreceptors and stimulates the production of some neurotransmitters. It promotes the production of Gamma-Amino Butyric acid (GABA) which inhibits nerve transmissions to the brain, calming any nervous activity of the CNS. It is capable of crossing the blood-brain barrier which speeds up absorption.

There have been a number of researches and studies done to prove the therapeutic benefits of L-Theanine. A paper published by researchers of the Food Science and Technology in 1999 measured the brain waves of people who were given 50 to 200 mg of Theanine weekly. Those who received the highest doses produced the most alpha brain waves, allowing them to be alert enough to perform complex tasks while staying relaxed.

Benefits of Stacking L-Theanine and Caffeine

Using L-Theanine and caffeine together (also called stacking) produces synergistic benefits, not available when taking both substances on their own. Many of the negative effects of taking caffeine like restlessness and anxiety are nullified by the nootropic nature of L-Theanine. It dissipates jittery muscles, hyperactive energy and the inability to rest. The cognitive benefits of this combination are dramatic.

Studies report greater visual acuity, an increase in muscle dexterity, a significant increase in mental focus, alertness, better reaction times, enhanced memory recall and longer attention span.

Finding the perfect dose of The L-Theanine and Caffeine Stack

In determining the best ratio of both supplements, the aforementioned studies indicate a 2:1 ration. That is, 2 part of L-Theanine combine to 1 part caffeine. For example, 400 mg of L-Theanine and 100 mg of caffeine. The ratio reported to have the greatest success among users is actually 1:1 (100-200mg of caffeine to 100mg-200mg of L-Theanine). For reference, an average cup of coffee contains about 100 mg of caffeine.

Is The Caffeine + L-Theanine Stack Safe?

Large dosages of caffeine are known to cause disrupted sleep and in some cases, cardiac arrhythmias. Overdose may induce nausea and diarrhea. L-Theanine does not have any major side effects. It is also water-soluble thus preventing the possibility of toxicity. It is generally recommended to start with lower doses of 1:1, gradually increasing the ration over a period of days or weeks until the desired effect is reached. The L-Theanine and caffeine combo is one of the safest nootropic stacks when taken responsibly.

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Juneja, L. R., Chu, D.-C., Okubo, T., Nagato, Y. & Yokogoshi, H. Corrigendum to “L-theanine—a unique amino acid of green tea and its relaxation effect in humans.” Trends in Food Science & Technology 10, 425 (1999).

Kahathuduwa, C. N., Dassanayake, T. L., Amarakoon, A. M. T. & Weerasinghe, V. S. Acute effects of theanine, caffeine and theanine–caffeine combination on attention. Nutritional Neuroscience 160211224746001 (2016).

Parnell, H., Owen, G. & Rycroft, J. Combined effects of L-theanine and caffeine on cognition and mood. Appetite 47, 273 (2006).

Result Filters. National Center for Biotechnology Information at <>

Theanine – Scientific Review on Usage, Dosage, Side Effects. Theanine at <>