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L-Theanine
L-Theanine is an amino acid found mainly in tea leaves and is popular in supplements built around calmer focus. It is especially common next to caffeine, where users want a smoother stimulation profile.
Key Benefits
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Calm Alertness
Promotes relaxed focus without drowsiness or jitters.
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Anxiety Reduction
Often chosen by people who want a calmer feel without classic drowsiness.
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Caffeine Synergy
Smooths out caffeine's stimulating effects, reducing jitters.
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Sleep Quality
May improve sleep quality when taken in the evening.
How It Works
L-theanine is usually described through its practical effect: helping a caffeine-containing formula feel smoother and less jagged. That is more useful than overselling precise neurotransmitter mechanics.
Scientific Research
L-theanine reduces psychological and physiological stress responses
Biological Psychology • 2007
L-theanine significantly reduced stress responses and promoted relaxation.
Read StudyThe combination of L-theanine and caffeine improves cognitive performance
Nutritional Neuroscience • 2008
L-theanine + caffeine improved attention and task switching more than caffeine alone.
Read StudyFrequently Asked Questions
Can I combine L-Theanine with caffeine?
Yes. It is one of the most practical pairings in focus supplements because many people find that L-theanine makes the caffeine experience feel smoother and easier to handle.
Does L-Theanine make you sleepy?
Usually not. Most people use it for calm focus rather than for sedation. At higher doses some people may prefer it later in the day, but in many formulas it is used specifically to make focus feel cleaner.
How quickly does L-Theanine work?
Many people start noticing the feel of L-theanine within roughly 30-45 minutes. In practice, it is usually valued for making a caffeine-containing formula feel smoother rather than harsher.
Safety Information
Possible Side Effects
- Mild drowsiness (at high doses)
- Headache (rare)
Drug Interactions
- Blood pressure medications (may enhance effects)
Contraindications
- None well established
Dosage Information
Recommended Daily Dose
100-200mg per day
Range
50-400mg
Timing
Any time; often combined with caffeine (2:1 ratio theanine:caffeine)
Aftershock V2 contains 400mg per serving, paired with 160mg caffeine.
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