L-Theanine 400 mg by Pure Encapsulations

If you are considering L-theanine for anxiety during work, study, or travel, this 400 mg capsule fits a fast-acting, non-drowsy use case. It’s useful for people who feel “wired but tired,” are sensitive to caffeine jitters, or have racing thoughts at bedtime. Adults who want calm without losing focus tend to do well. The label also includes dosing for kids and teens under caregiver guidance.

L-theanine increases alpha brain waves (the relaxed-yet-alert pattern seen on EEG) and tempers glutamate signaling (glutamate is the brain’s main excitatory chemical). In practice, that feels like smoother focus with less edge. It also nudges GABA (a calming neurotransmitter) and can blunt caffeine’s overstimulation. During acute stress it may slightly lower blood pressure, which is one reason some people notice less thumping heartbeat.

Pure Encapsulations L-theanine provides 400 mg per capsule. Take between meals. Adults typically use one capsule 1–3 times daily; onset is 30–60 minutes and lasts about 4–8 hours. For bedtime wind-down, take it 30–60 minutes before lights out. For focus with coffee, many use a 2:1 theanine-to-caffeine ratio. Children and teens can use the lower label dose with clinician or caregiver oversight.

If you take blood pressure medication, monitor for lightheadedness as L-theanine can mildly lower pressure during stress. It can add to the calming effect of sedatives, alcohol, or antihistamines. With stimulant medications for attention, it often smooths side effects, but coordinate dosing with your prescriber. Pregnancy and breastfeeding have limited data, so use only with clinician guidance.