Caffeine
Caffeine is a moderate-risk supplement with an RDA of 100 mg and a tolerable upper intake level (UL) of 400 mg per day according to EFSA standards. All 1 regional standards agree on these limits. It has 1 known interaction with other supplements including l-theanine. Use NutriAudit to check if your supplement stack keeps this ingredient within safe limits.
Quick take
Caffeine sits in the Energy & Metabolism 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.
Taking multiple supplements? Check Caffeine for overlap
If Caffeine appears on two product labels, enter each daily amount and check the combined label total.
Check Caffeine across my supplementsFree. No account required.
Regional Reference Values
| Region | Organization | RDA | Upper Limit (UL) | Unit |
|---|---|---|---|---|
| 🇪🇺 Europe | Research | 100 | 400 | mg |
RDA = Recommended Daily Allowance (adequate intake for most adults). UL = Tolerable Upper Intake Level; some authorities have not established one.
Known Interactions
L-theanine helps reduce caffeine jitters (positive interaction).
Taking L-theanine with caffeine may improve focus.
How to use this page
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.
Frequently Asked Questions
How much Caffeine is too much?
Research lists a formal upper limit (UL) of 400mg per day for Caffeine. Other regions may use a different value or have no established UL.
What is the recommended daily dose of Caffeine?
The RDA for Caffeine is 100mg per day for most adults. This amount is sufficient to meet the needs of 97-98% of healthy individuals.
Does Caffeine interact with other supplements?
Yes, Caffeine has 1 known interaction with other supplements. L-theanine helps reduce caffeine jitters (positive interaction).
Are you taking Caffeine?
Check if your supplement stack keeps Caffeine 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.
Uses cited public reference data where the current dataset has a verified entry.