Natural Factors
High Potency L-Theanine 250 mg
85/100
SUPPIE SCORE
74/100
EFFICACY
High
SAFETY
90/100
CLEANLINESS
What Does High Potency L-Theanine 250 mg Do?
Provides 250 mg of L-theanine, an amino acid shown in randomized trials to promote calm alertness and reduce acute stress reactivity, though clinical effects on persistent anxiety or chronic insomnia remain modest.
Will taking 250 mg of L-theanine make me feel drowsy during the day?
Can I combine L-theanine with my morning coffee or tea?
How quickly does L-theanine start working after taking a capsule?
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What Are the Benefits of High Potency L-Theanine 250 mg?
Based on proven scientific research
Reduces acute stress and anxiety symptomsStrong
Promotes calm alertness and selective attentionStrong
Improves subjective sleep qualityModerate
Good For:
What Are the Side Effects of Natural Factors High Potency L-Theanine 250 mg?
Always consult your health practitioner if in doubt.
RiskLow Risk
Overview
•Sedative medications: may add to central nervous system depression or daytime drowsiness; evaluate combination with a healthcare professional before use.
•Antihypertensive drugs: mild hypotensive effects have been observed in stress trials; monitor blood pressure regularly if combining.
•Pregnancy and breastfeeding: clinical safety data are lacking; avoid supplemental doses above normal dietary intake.
•Stop and get advice if: severe dizziness or lightheadedness: discontinue use and check blood pressure.
•Stop and get advice if: persistent headache or severe nausea: stop taking the supplement and seek clinical evaluation.
Potential Side Effects
Negative Interactions
Inactive Ingredients
Rice flour
Low RiskVegetarian capsule (hypromellose, purified water)
Low RiskMagnesium stearate (vegetable grade)
Low RiskSilica
Low RiskWhat Are the Ingredients in Natural Factors High Potency L-Theanine 250 mg?
L-Theanine
250 mg
Rice flour
vegetarian capsule (hypromellose, purified water)
magnesium stearate (vegetable grade)
silica
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Dosage & Bioavailability
How the active doses and forms in High Potency L-Theanine 250 mg compare to the research.
•L-Theanine — 250 mg per capsule, 1 capsule a day: 250 mg a day; within the 200-400 mg/day used in studies.
•L-Theanine — 250 mg a day, within the studied range.
Frequently Asked Questions
Common questions about Natural Factors High Potency L-Theanine 250 mg