BioStacks
Natural Factors
Stress-Relax, Suntheanine L-Theanine, 100 mg, 120 Chewable Tablets
2 Tablets × 1.5/day
Best for
Ingredients (1)
Suntheanine® L-Theanine
100%Dose/day
300 mg
Target
100–250 mg
Form
Premium
Other Ingredients (7)
SucroseSweetener
Added sugars and high glycemic load; dental caries risk
XylitolSweetener
A FODMAP sugar alcohol that can cause GI distress (bloating, gas, diarrhea) at moderate doses (>10-20g/day), though supplement amounts are typically small. Extremely toxic to dogs — households with pets should store securely.
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
Natural Tropical FlavorFlavor
A proprietary natural flavoring blend imparting tropical-fruit taste
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Citric AcidAcidulant
Natural acid derived from citrus fruits
Stearic AcidLubricant
Saturated fatty acid used as tablet lubricant
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
Label directs 1.5 servings — keep one for the evening
On the label
Chew 1-2 tablets 3 times per day or as directed by a health professional.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$35.67
Pricier than 76% 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.