NOW
L-Theanine 100 mg
83/100
SUPPIE SCORE
68/100
EFFICACY
High
SAFETY
90/100
CLEANLINESS
What Does L-Theanine 100 mg Do?
Provides 100 mg of L-theanine with decaffeinated green tea to promote calm focus, though clinical trials most consistently demonstrate stress reduction at doses of 200 mg or higher.
Should I take one or two capsules to reach the typical clinical trial dose?
Can I combine this supplement with my morning coffee?
Does this product cause daytime drowsiness or impair concentration?
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What Are the Benefits of L-Theanine 100 mg?
Based on proven scientific research
Promotes calm alertness and relaxationModerate
Increases resting alpha brain wave activityModerate
Supports sustained attention under acute stressModerate
Good For:
What Are the Side Effects of NOW L-Theanine 100 mg?
Always consult your health practitioner if in doubt.
RiskLow Risk
Overview
•Sedative medications: L-theanine can have additive central nervous system depressant effects; avoid combining with prescription sleep aids or sedatives without clinician input.
•Blood pressure medications: L-theanine can modestly lower blood pressure; monitor readings when co-administering with antihypertensive drugs.
•Pregnancy and breastfeeding: clinical safety data for supplemental L-theanine are insufficient; avoid use during pregnancy and lactation.
•Stop and get advice if: jaundice, dark urine, or upper abdominal pain: rare signs of liver distress linked to concentrated green tea preparations.
•Stop and get advice if: severe lightheadedness or dizziness: could signal an excessive drop in blood pressure.
Potential Side Effects
Negative Interactions
Inactive Ingredients
Hypromellose (cellulose capsule)
Low RiskRice flour
Low RiskStearic acid (vegetable source)
Low RiskSilicon dioxide
Low RiskWhat Are the Ingredients in NOW L-Theanine 100 mg?
L-Theanine
100 mg
Decaffeinated Green Tea (Camellia sinensis) (Leaf)
250 mg
Hypromellose (cellulose capsule)
Rice Flour
Stearic Acid (vegetable source)
Silicon Dioxide
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Dosage & Bioavailability
How the active doses and forms in L-Theanine 100 mg compare to the research.
•L-Theanine — 100-200 mg a day; studies use 200-400 mg/day. The higher daily dose reaches it; the lowest falls short.
•Decaffeinated Green Tea (Camellia sinensis) (Leaf) — EGCG content is not stated, so the dose and the EGCG level EFSA linked to raised liver enzymes (under 800 mg/day) cannot be checked.
Sources & References
Frequently Asked Questions
Common questions about NOW L-Theanine 100 mg