Key Health Benefits

Benefit Area	Description	PubMed Link
Cognitive enhancement (attention)	In middle-aged subjects, L-theanine intake (single 150 mg dose) improved attention and working memory. Specifically, it reduced reaction time on a Stroop attention task and increased correct answers with fewer omission errors in a working memory test. This suggests L-theanine can acutely boost focus and executive function.	PubMed: 33751906
Blood pressure regulation	Under mental stress, L-theanine (200–250 mg) blunted stress-induced blood pressure increases. In high-stress responders, those taking L-theanine showed significantly smaller systolic/diastolic rises during a stressful task than placebo. L-theanine also reduced tension-anxiety scores in this trial, indicating cardiovascular and anxiety benefits.	PubMed: 23107346
Immune support (Th1/Th2 balance)	In athletes undergoing intense training, 6-week L-theanine supplementation (300 mg/day) favorably modulated immune markers. The supplemented group showed a decrease in IL-10 (an anti-inflammatory cytokine) and an improved Th1/Th2 cytokine ratio. This suggests L-theanine helps restore immune balance after strenuous exercise.	PubMed: 30770758

Dosage Recommendation

Goal	Stack
Daily Relaxation & Stress Relief	100–200 mg L-theanine once or twice daily, ideally mid-morning and/or mid-afternoon
Enhanced Focus (with Caffeine)	50 mg L-theanine + 90 mg caffeine 30 min before cognitively demanding tasks
Sleep Support	200–250 mg L-theanine 30–60 min before bedtime
Blood Pressure Management	200 mg L-theanine daily, split morning/evening

Supplement Facts

NUTRITIONAL INFORMATION
Serving Size: 1 veg. Capsule
	Amt. per Serving	% RDA Men	% RDA Women
L-Theanine	100mg
Vitamin B1	1.7mg	94.44	100
Ingredients: L-Theanine, Vitamin B1, Bulking Agent INS 460 (i), Anticaking Agent INS 341(iii) & Vegetable Capsule Shell (HPMC) (INS 464)

When Will I See Results?

Goal	Expected Timeline
Stress & Anxiety Reduction	Within 30–60 minutes for acute relief; cumulative benefit over 1–2 weeks
Improved Sleep	Noticeable after the first week; optimal effects by 3–4 weeks
Cognitive Performance	Within 30 minutes when combined with caffeine; sustained benefits with regular use
Blood Pressure Support	Gradual (4–6 weeks) for measurable reductions
Immune Modulation	Within 4 weeks under sustained stress conditions

How to Maximise Results

Goal	Stack
Relaxation & Sleep	L-theanine + magnesium glycinate (200 mg) + good sleep hygiene
Mental Focus	L-theanine + caffeine (match study ratios) + B-complex vitamin
Blood Pressure Support	L-theanine + omega-3 fish oil (1 g EPA/DHA) + DASH-style diet
Immune Resilience	L-theanine + vitamin C (500 mg) + regular moderate exercise

What to Avoid

Substance	Reason to Avoid	Spacing Tip
High-Dose Stimulants	May counteract L-theanine’s calming effects	Avoid within 2 hours of large stimulant doses
Alcohol	Can interfere with sleep-supportive benefits	Avoid alcohol within 2 hours of bedtime dose
Sedative Medications	Additive CNS depressant effects may occur	Consult a healthcare provider if combining

Third Party NABL Lab Report

Third Party NABL Lab Report for L-Theanine :

 

Click here to view the report