Vitamin D is a high-risk supplementwith an RDA of 600 IU and a safe upper limit (UL) of 4000 IU per day according to FDA standards. CNS lists a RDA of 400 IU and a UL of 800 IU. It has 1 known interaction with other supplements including vitamin k. Regular monitoring is strongly recommended when adjusting your intake.
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.
Excess vitamin D can raise blood calcium (hypercalcemia), causing kidney stones, nausea, and heart rhythm issues.
| Region | Organization | RDA | Upper Limit (UL) | Unit |
|---|---|---|---|---|
| 🇺🇸 United States | FDA | 600 | 4000 | IU |
| 🇪🇺 Europe | EFSA | 600 | 4000 | IU |
| 🇦🇺 Australia | TGA | 600 | 4000 | IU |
| 🇨🇳 China | CNS | 400 | 800 | IU |
| 🇯🇵 Japan | MHLW | 600 | 4000 | IU |
RDA = Recommended Daily Allowance (adequate intake for most adults). UL = Tolerable Upper Intake Level (maximum safe daily amount).
Vitamin D increases calcium absorption; Vitamin K helps direct calcium to bones.
Consider taking both together for bone health.
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 Vitamin D is 4000IU per day according to FDA. Exceeding this amount regularly may increase the risk of adverse effects.
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.
Yes, Vitamin D has 1 known interaction with other supplements. Vitamin D increases calcium absorption; Vitamin K helps direct calcium to bones.
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.
Based on reference standards from FDA, EFSA, TGA, and MHLW.