Quick answer
For L-Theanine, check the ingredient list, allergen statement, dose per serving, medication cautions, and any condition-specific warnings. Side effects can vary by person and by product format.
Check these first
Ingredient risks: L-Theanine · Form and serving: Vegetarian capsule, 2 capsules · Price context: retailer price was not available at last check; retailer prices can change.
Label check
Side effect checklist
- Active ingredients: confirm L-Theanine and the amount per serving rather than relying on the front label.
- Serving context: compare Vegetarian capsule and 2 capsules with how often the label says to use it.
- Allergens and inactive ingredients: check flavors, sweeteners, capsules, gelatin, oils, dairy, soy, gluten, fish, or shellfish when they matter to you.
- Overlap: count similar ingredients from multivitamins, powders, blends, gummies, drinks, and topical products before adding another product.
- Check dose, form, allergens, medication cautions, health conditions, pregnancy or breastfeeding context, and total intake from overlapping supplements.
- Use the current product label first because formulas, serving sizes, and warnings can change.
Before using
Label issues to check
Label cautionsScreen pregnancy, breastfeeding, medication use, and daytime drowsiness context. Medication: Screen relevant medications before use.
Allergy checkCheck active ingredient source, capsule, softgel, flavor, and excipient details.
Medication contextScreen relevant medications before use.
Condition contextPregnancy, breastfeeding, chronic medical conditions, and unusual symptoms need professional guidance. Pregnancy/Breastfeeding: Ask a healthcare professional before use during pregnancy or breastfeeding.
Safety signals
When to stop and get help
- Get urgent help for trouble breathing, facial or throat swelling, severe hives, fainting, chest pain, or a severe allergic reaction.
- Stop using the product and contact a clinician if you notice a severe rash, persistent vomiting, severe diarrhea, black or bloody stool, yellowing skin, or unusual weakness.
- For topical products, stop and seek help if scalp or skin irritation becomes severe, spreads, blisters, or involves the eyes.
- For children, pregnancy, breastfeeding, major medical conditions, or multiple medications, use clinician guidance before relying on a supplement label alone.
This page is educational and does not replace care from a qualified clinician.
Product context
Why side effects can differ
L-Theanine is a L-Theanine product from Life Extension. Side effects can depend on dose, form, inactive ingredients, allergies, medication use, health conditions, and whether you use similar products at the same time.
Price context: retailer price was not available at last check; retailer prices can change.
Ingredients and goals
Follow the ingredient, then the goal
Connected ingredients: L-Theanine. Connected goals: Daily Maintenance.
Safety notes
Cautions recorded for review
These notes may include ingredient-level guidance, not verified adverse reactions to this exact finished product. Product-specific reaction frequencies have not been established by this record.
- Screen pregnancy, breastfeeding, medication use, and daytime drowsiness context.
- Medication: Screen relevant medications before use.
- Condition: Pregnancy, breastfeeding, chronic medical conditions, and unusual symptoms need professional guidance.
- Allergy: Check active ingredient source, capsule, softgel, flavor, and excipient details.
- Possible side effect: Digestive discomfort, drowsiness, or intolerance can occur depending on ingredient and user context.
- Pregnancy/Breastfeeding: Ask a healthcare professional before use during pregnancy or breastfeeding.
- Ingredient context: Screen pregnancy, breastfeeding, sedatives, blood pressure medication, and daytime sleepiness context.
Serving and label record
Recorded serving: 2 capsules
Recorded active amount: 200 mg AlphaWave L-theanine
Product form: Vegetarian capsule
These are database entries, not a personalized dose recommendation. A serving size alone does not establish daily frequency, age suitability, duration, or route of use. Follow the directions on your exact package; formulations and country-specific labels can differ.
Record verification date: 2026-07-29
This date describes the product record; it does not confirm that every warning or allergen field has been reviewed.
Check the recorded product source
Allergens and inactive ingredients
Allergy-related notes in the database, not a complete verified allergen declaration:
- Check active ingredient source, capsule, softgel, flavor, and excipient details.
Complete ingredient list, contains/may-contain statements, and manufacturing cross-contact information: not confirmed by this summary. Check the current package or manufacturer. Do not treat a dietary preference filter as an allergen guarantee.
Label Check
- Last checked
- 2026-07-29
- Next check
- 2026-08-28
- Label confidence
- Structured Source Review
Shown fields
Brand, Product Name, Category, Dosage Form, Serving Size, Ingredient Links, Dose Or Active Amount, Source Url
Can change
Price Per Serving, Availability, Servings Per Container, Label Warnings, Testing Claims
Check the current product label and safety warnings before buying or using this product.
Suggest an update
Related pages
Open the next check
Related question path
Follow the next useful question
Start with the question that brought you here, then check the ingredient, the related concern, and the product list.
Used this before?
If you have tried this product, a short optional check-in can help make future comparisons more useful.
Share a quick check-in
