For calm focus without the drowsiness, this **L-Theanine** gives you 100mg per capsule — right at the effective minimum for easing stress and steadying attention. This amino acid from tea nudges your brain into a relaxed-but-alert state and dampens stress reactivity, with consistent clinical backing in the 100–200mg range.
Theanine pairs especially well with caffeine — it smooths out the jitters while sharpening focus, a genuinely well-supported combo worth stacking with your morning coffee. The most-studied single dose is 200mg, and the label allows one to four capsules daily, so two capsules puts you on the firmest research footing for stress relief.
BioStacks
Best for
Ingredients (1)
L-Theanine
100%Dose
100 mg
Target
100–250 mg
Form
—
Other Ingredients (4)
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Vegetable StearateLubricant
A plant-derived salt of stearic acid (typically magnesium or calcium) used as a tablet lubricant
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
How to Take It
Best taken in the evening
Calming — common before bed, or in the morning when paired with caffeine for focus.
With or without food
On the label
Read the entire label and follow the directions carefully prior to use. Directions: Take one (1) capsule one to four times daily, or as recommended by a healthcare practitioner.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$18.00
Cheaper than 73% of 101 theanine supplements
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the National Academies Dietary Reference Intakes (DRI).
This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.
The score analyzes what's on the label: ingredient doses vs. studied ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.