Quick answer
For Theanine 200, 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: Capsule, 1 capsule · Price context: $0.31 per serving estimate 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 Capsule and 1 capsule 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
Most likely label issues
Label cautionsReview label cautions and ingredient context before use. Medication: Check sedating medications, alcohol use, or other calming supplements before combining.
Allergy checkCheck the allergen statement and inactive ingredients, especially if you avoid dairy, soy, fish, shellfish, gluten, gelatin, or sweeteners.
Medication contextCheck sedating medications, alcohol use, or other calming supplements before combining.
Condition contextPregnancy/Breastfeeding: Pregnancy and breastfeeding safety data may be limited; ask a healthcare professional.
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
Theanine 200 is a Relaxation product from Jarrow Formulas. 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: $0.31 per serving estimate at last check; retailer prices can change.
Ingredients and goals
Follow the ingredient, then the goal
Connected ingredients: L-Theanine. Connected goals: Stress, Sleep.
Safety notes
Known cautions from the product record
- Review label cautions and ingredient context before use.
- Medication: Check sedating medications, alcohol use, or other calming supplements before combining.
- Possible side effect: Drowsiness, headache, or lower alertness may occur for some users.
- Pregnancy/Breastfeeding: Pregnancy and breastfeeding safety data may be limited; ask a healthcare professional.
- Ingredient context: Screen pregnancy, breastfeeding, sedatives, blood pressure medication, and daytime sleepiness context.
Label Check
- Last checked
- 2026-07-23
- Next check
- 2026-08-22
- Source
- Product label snapshot
- Label confidence
- Label check needed
Shown fields
Brand, Product Name, Category, Dosage Form, Serving Size, Ingredient Links, Safety Structure
Can change
Price Per Serving, Availability, Servings Per Container, Label Warnings, Testing Claims
Check the current product label before buying or using this product.
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