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Author: Admin | 2025-04-28
Dizziness, start with a low dose and realize that the dizziness may subside as your physiology adapts to the L-theanine.Gastrointestinal discomfort: Another common side effect of L-theanine is gastrointestinal discomfort and/or pain. If you notice that your digestive system is acting up and/or you feel stomach pain, it could be from the supplementation. To minimize this side effect, you’ll want to consider taking it with food and/or at a lower dose.Headaches: Many people report headaches from L-theanine, which is relatively counterintuitive because the supplement increases relaxation. A majority of headaches associated with supplementation occur for a few days, and diminish as a person’s body adjusts to the effect of the supplement. The headaches stemming from L-theanine may be related to its complex effect on nitric oxide, which is known to cause headaches.Low energy: Taking L-theanine may promote increased physical and mental relaxation. While increased relaxation is nice, some individuals may note reduced overall energy as a result. If L-theanine is making you feel increasingly sluggish, you could augment its supplementation with caffeine and/or reduce the dosage. Understand that reductions in energy may be temporary and associated with neurophysiological adjustments to the supplement.Low serotonin: L-theanine has been suggested to alter neurotransmission of serotonin – some evidence suggesting increases, while other studies suggesting decreases. The evidence suggesting decreases note that while L-theanine increases levels of tryptophan (a precursor to serotonin), it reduces cortical levels of serotonin (5-HT) and decreases serotonin synthesis (5HIAA). Among certain individuals, a decrease in serotonin and/or serotonergic adjustment may serve as an unwanted side effect.Nausea: It is possible to feel nauseated following supplementation with L-theanine. This nausea may be more common when administered on an empty stomach, but may also be a sign that your body is not well-adapted to accommodating large doses. To minimize the likelihood of feeling nauseous, start with a low dose and titrate upwards.Sleepiness: While L-theanine doesn’t seem to cause drowsiness and/or somnolence in most individuals, it may synergistically exacerbate sleepiness among individuals that are already tired, fatigued, and/or taking a CNS depressant (e.g. alcohol). It is also important to consider that when taken at extremely high doses, its anxiolytic effect may be potent enough to provoke sleepiness in certain individuals.Stomach aches: It is very common to develop stomach aches following L-theanine supplementation. L-theanine is known to cause gastrointestinal distress and may provoke diarrhea. If you notice that you’re feeling stomach pain after taking
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