# How L-Theanine Calms You Without Sedating You Published 2026-04-14 · Max Ninthara · Tags: energy, ingredient science, L-Theanine, nervous system, sleep, supplements > L-Theanine is an amino acid from tea leaves that increases alpha brain wave activity. STRIPPIES uses 30mg in ENERGY with caffeine and 50mg in SLEEP with calming botanicals. Here is why the dose shifts. L-Theanine is an amino acid from tea leaves. Research links it to increased alpha brain wave activity, the signature of relaxed alertness. STRIPPIES uses two doses: 30mg in ENERGY paired with caffeine, and 50mg in SLEEP paired with calming botanicals. Here is what it does at the receptor level, why the dose shifts, and what the research says. L-Theanine Questions, Answered What does L-Theanine do to your nervous system? L-Theanine crosses the blood-brain barrier and increases alpha brain wave activity, which is linked to relaxed alertness. A 2008 study in Nutritional Neuroscience documented the mechanism. It also influences GABA, serotonin, and dopamine without acting as a sedative. Can L-Theanine calm you without making you tired? Yes. L-Theanine shifts brain wave activity toward alpha frequencies, the signature of a relaxed-but-alert vibe. It is not a sedative. At 30mg with caffeine in STRIPPIES ENERGY, the result is focused alertness. At 50mg in STRIPPIES SLEEP, it supports the wind-down. How much L-Theanine is in a STRIPPIES strip? 30mg in ENERGY, paired with 50mg caffeine. 50mg in SLEEP, paired with melatonin, Valerian Root, and calming botanicals. Both doses are printed on the label next to every other ingredient. Does L-Theanine affect athletic performance? Research on the caffeine plus L-Theanine combination shows improved reaction time and attention-switching. The 2008 Nutritional Neuroscience study reported faster speed and accuracy on cognitive tasks with less distraction susceptibility than caffeine alone. L-Theanine does not slow reaction time at supplement doses. What L-Theanine Does L-Theanine is an amino acid found mostly in Camellia sinensis, the tea plant. It crosses the blood-brain barrier and influences several neurotransmitter systems without sedating the nervous system. Research in Nutritional Neuroscience describes its primary mechanism: it increases alpha brain wave activity, the signature of relaxed alertness that sits between full wakefulness and drowsiness. See Nobre, Rao & Owen, 2008. L-Theanine does not suppress the nervous system the way sedatives or antihistamines do. It shifts the balance instead of flattening it, so the vibe is calmer without being slower. It also influences GABA, serotonin, and dopamine levels, per research reviewed by the NIH Office of Dietary Supplements. Those neurotransmitters play roles in how you handle pressure and how you wind down. L-Theanine supports the conditions under which they function normally. Why STRIPPIES Uses Two Different Doses STRIPPIES uses L-Theanine in two products at two doses, and the difference is deliberate. ENERGY: 30mg with 50mg Caffeine In ENERGY, L-Theanine is not there for relaxation. It shapes the caffeine response. The 2008 Nutritional Neuroscience study tested L-Theanine plus caffeine on cognitive performance. Participants who got both showed faster speed and accuracy on attention-switching tasks with less distraction susceptibility than caffeine alone. Study: Owen et al., 2008. At 30mg paired with 50mg caffeine, L-Theanine takes the edge off the stimulant response. Caffeine brings the alertness. L-Theanine keeps the jittery overshoot contained. The point of ENERGY is focused energy, not calm. SLEEP: 50mg with Melatonin and Calming Botanicals In SLEEP, L-Theanine plays a different role at a higher dose. It works alongside melatonin, Valerian Root, and calming botanicals like Lavender, Chamomile, and Hibiscus to support the transition from awake to asleep. A 2019 randomized controlled trial in Nutrients linked L-Theanine at 200mg/day to better self-reported sleep quality scores compared with placebo. See Hidese et al., 2019. At 50mg in SLEEP, L-Theanine contributes to the wind-down, helping the nervous system downshift so melatonin has a cleaner runway. How L-Theanine Fits the Day-Night Loop Pressure, rest, and energy are linked. Poor sleep elevates cortisol. Elevated cortisol drains energy. Low energy drives more stimulants. Stimulants disrupt sleep. The loop repeats. L-Theanine shows up at two points in that loop. In the morning via ENERGY, it shapes the caffeine response so the stimulant does not overshoot into jittery territory. At night via SLEEP, it supports the nervous system's downshift so the conditions for rest improve. STRIPPIES was physician formulated with this loop in mind. Same ingredient, two doses, two roles. Every milligram earns its place. What Athletes Ask Does L-Theanine affect reaction time? Research suggests it may improve reaction time when combined with caffeine. The Owen et al. 2008 study found faster attention-switching in the combination group. L-Theanine alone does not slow reaction time at supplement doses. Can I stack L-Theanine with pre-workout? L-Theanine is an amino acid, not a stimulant, so it does not add to your stimulant load. If your pre-workout is caffeinated, L-Theanine may moderate the overshoot. Check with a physician when combining multiple supplements. Will SLEEP leave me groggy in the morning? L-Theanine is not a sedative. It supports the conditions for rest rather than forcing it. The SLEEP formula uses calming compounds like L-Theanine, Valerian, and Lavender instead of sedating ones, which is how it targets restful sleep without next-day fog. Shop STRIPPIES ENERGY and STRIPPIES SLEEP at gostrippies.com. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary. STRIPPIES — OWN THE MOMENT. ## Source Canonical HTML: . Structured JSON sibling: (full feed). Last rendered: 2026-07-27T14:49:23Z. For more STRIPPIES content, see the [blog index](/blogs/news?view=md) or the homepage at .