L-theanine is a moderate-risk supplementcommonly taken at 200 mg per day with a suggested upper limit of 1200 mg according to EFSA reference data. This page currently includes one reference source. Treat it as safety context, not a complete global standard comparison. It has 1 known interaction with other supplements including caffeine. Use NutriAudit to check if your supplement stack keeps this ingredient within safe limits.
L-theanine sits in the Other Supplements category. This page consolidates 1 regional standard, and the numbers are broadly aligned, so the bigger question is whether your total dose stays in range.
It also has 1 known interaction, so the question is not just the label dose but whether the rest of your stack adds extra risk.
| Region | Organization | Typical Dose | Upper Limit (UL) | Unit |
|---|---|---|---|---|
| 🇪🇺 Europe | EFSA | 200 | 1200 | mg |
Typical Dose = commonly used amount, not an official RDA. UL = Tolerable Upper Intake Level (maximum safe daily amount).
L-theanine helps reduce caffeine jitters (positive interaction).
Taking L-theanine with caffeine may improve focus.
First match your product label against the dose table above, then check whether the known interaction list includes anything in your current stack.
If you are taking multiple supplements, the safest approach is usually to audit the whole stack instead of judging a single bottle in isolation.
The safe upper limit (UL) for L-theanine is 1200mg per day according to EFSA. Exceeding this amount regularly may increase the risk of adverse effects.
A commonly used dose of L-theanine is 200mg per day. This is based on research literature, not an official RDA. Individual needs vary.
Yes, L-theanine has 1 known interaction with other supplements. L-theanine helps reduce caffeine jitters (positive interaction).
Check if your supplement stack keeps L-theanine within safe limits.
Audit My SupplementsDisclaimer: NutriAudit is a decision-support tool designed to help you review your supplement stack for potential duplicate, conflicting, or excessive ingredients. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making changes to your supplement routine, especially if you are pregnant, nursing, taking medications, or have a medical condition.
Based on reference standards from FDA, EFSA, TGA, and MHLW.