If you’ve ever wished for a way to stay calm yet mentally sharp without the jitters of too much caffeine, L-Theanine might be just what you’re looking for.

This natural compound, found primarily in green tea leaves, has been gaining attention as a gentle “nootropic”. A nootropic is a substance that may enhance mental function. But what makes L-Theanine special is that it supports both relaxation and focus at the same time.

So what is L-Theanine? L-Theanine is an amino acid known for promoting a relaxed alertness. It’s what gives tea its smooth, soothing quality, helping balance out the stimulating effects of caffeine. Unlike some nootropics that can overstimulate, L-Theanine helps the brain find its calm centre. It is ideal for mental clarity, focus, and stress resilience.

There are several research that shows that L-Theanine can influence several brain pathways. In one study, L-theanine was found to increase alpha brainwave activity. These waves are linked to a calm, focused mental state like the feeling you get during meditation or creative flow ¹. L-Theanine also helps regulate GABA, serotonin, and dopamine - chemicals that affect mood, concentration, and motivation. L-theanine may reduce overstimulation by moderating glutamate activity, it helps prevent the mental “noise” that can make it hard to focus ².

Together, these effects promote a steady, relaxed attention making it easier to concentrate, learn, and perform under pressure.

Several studies have also explored how L-Theanine affects mental function and stress. A single dose of L-Theanine (100–200 mg) has been shown to improve attention and reaction time in healthy adults ³. When combined with caffeine, it may enhance alertness and accuracy while reducing jitteriness ⁴. And regular use of L-theanine may help buffer stress, supporting mental clarity and calm during demanding situations ⁵.

L-Theanine is often taken in doses of 100–200 mg, about 30–60 minutes before a mentally demanding task. Many people enjoy pairing it with a morning coffee or green tea for smoother, more focused energy.

It’s generally considered safe for healthy adults and is well tolerated, but as with any supplement, it’s best to consult your healthcare professional if you have existing conditions or take medication.

For further information on L-theanine or other health issues, call to see the team at Go Vita, Your Health Shop at 5 North St, Batemans Bay or phone on 44729737. Don’t forget to tune in to Marianne and Go Vita’s Nutritionist Sofia on 2EC after 12.30pm every Wednesday.

References

1. Kobayoshi, K, Nagato, Y, Aoi,N, Juneja. L, Kim, M, Yamamoto, T, Sugimeto, S. Effects of L-Theanine on the Release of α-Brain Waves in Human Volunteers, Nippon Nōgeikagaku Kaishi, 1998, Volume 72, Issue 2, Pages 153-157
2. Nathan, P. J., Lu, K., Gray, M., & Oliver, C. (2006). The neuropharmacology of L-theanine (N-ethyl-L-glutamine): A possible neuroprotective and cognitive enhancing agent. Journal of Herbal Pharmacotherapy, 6(2), 21–30.Owen, G. N., et al. “The Combined Effects of L-Theanine and Caffeine on Cognitive Performance and Mood.” Nutritional Neuroscience (2008).
3. Camfield, D. A., et al. “High-Dose L-Theanine–Caffeine Combination Improves Measures of Selective Attention.” British Journal of Nutrition (2025).
4. Kimura, K., et al. “L-Theanine Reduces Psychological and Physiological Stress Responses.” Biological Psychology (2007).