Vitamin D
Vitamin D is a high-risk supplement with an RDA of 600 IU and a tolerable upper intake level (UL) of 4000 IU per day according to NIH/NASEM standards. NHMRC lists a RDA of 200 IU and a UL of 3200 IU; CNS lists a RDA of 400 IU and a UL of 2000 IU; MHLW lists a RDA of 360 IU with the same UL. It has 1 known interaction with other supplements including vitamin k. Regular monitoring is strongly recommended when adjusting your intake.
Quick take
Vitamin D sits in the Fat-Soluble Vitamins category. This page consolidates 5 regional standards, and the limits vary enough that you should not treat one region's rule as universal.
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 Vitamin D for overlap
If Vitamin D appears on two product labels, enter each daily amount and check the combined label total.
Check Vitamin D across my supplementsFree. No account required.
Overdose Risk Warning
Excess vitamin D can raise blood calcium (hypercalcemia), causing kidney stones, nausea, and heart rhythm issues.
Regional Reference Values
| Region | Organization | RDA | Upper Limit (UL) | Unit |
|---|---|---|---|---|
| 🇺🇸 United States | NIH Office of Dietary Supplements / National Academies FNB | 600 | 4000 | IU |
| 🇪🇺 Europe | European Food Safety Authority | 600 | 4000 | IU |
| 🇦🇺 Australia | NHMRC / Eat For Health | 200 | 3200 | IU |
| 🇨🇳 China | 国家卫健委 WS/T 578.4—2018 | 400 | 2000 | IU |
| 🇯🇵 Japan | MHLW Dietary Reference Intakes for Japanese 2025 | 360 | 4000 | IU |
RDA = Recommended Daily Allowance (adequate intake for most adults). UL = Tolerable Upper Intake Level; some authorities have not established one.
Known Interactions
Vitamin D increases calcium absorption; Vitamin K helps direct calcium to bones.
Consider taking both together for bone health.
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 Vitamin D is too much?
NIH Office of Dietary Supplements / National Academies FNB lists a formal upper limit (UL) of 4000IU per day for Vitamin D. Other regions may use a different value or have no established UL.
What is the recommended daily dose of Vitamin D?
The RDA for Vitamin D is 600IU per day for most adults. This amount is sufficient to meet the needs of 97-98% of healthy individuals.
Does Vitamin D interact with other supplements?
Yes, Vitamin D has 1 known interaction with other supplements. Vitamin D increases calcium absorption; Vitamin K helps direct calcium to bones.
Are you taking Vitamin D?
Check if your supplement stack keeps Vitamin D 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.