Answers › How much vitamin D is too much in Australia?
How much vitamin D is too much in Australia?
This page hasn't been reviewed by a pharmacist yet. It's general information, not medical advice.
Short answer
For adults, the Australian/NZ upper level of intake for vitamin D is 80 micrograms (µg) a day, which is 3,200 IU. That is the highest daily intake unlikely to cause harm for most adults, not a target. healthdirect notes vitamin D toxicity is rare but can cause too much calcium in the blood (hypercalcaemia). If you think you've taken too much, call the Poisons Information Centre on 13 11 26.
The number
The NHMRC Nutrient Reference Values set the adult upper level of intake for vitamin D at 80 µg/day. [1] Using the NIH ODS conversion (1 µg = 40 IU), that is 3,200 IU. [2]
Why it matters
Vitamin D is fat-soluble and can be stored in the body. healthdirect notes supplements rarely cause toxicity, but it can lead to hypercalcaemia, and people with certain conditions should not take vitamin D supplements. [3]
Where totals creep up
A standalone vitamin D, a multivitamin and a calcium-plus-D product can add up. List every product and total the IU.
Getting advice
healthdirect suggests asking your doctor about vitamin D blood tests and supplements if you're concerned, and calling the Poisons Information Centre (13 11 26) if you think you've taken too much. [3]
FAQ
Is 5,000 IU of vitamin D too much?
5,000 IU (125 µg) is above the Australian/NZ adult upper level of 3,200 IU (80 µg). Some people take higher doses under medical supervision; don't do so without your doctor's advice.
Is 1,000 IU a day safe?
1,000 IU (25 µg) is below the adult upper level. No dose is right for everyone, so check with your GP or pharmacist, especially if you have a medical condition or take medicines.
Related
- Best value vitamin D in Australia: how to compare cost per dose
- Can you take iron and calcium together?
- Every source the Checker uses
Sources
- NHMRC Nutrient Reference Values: Vitamin D
- NIH ODS: Vitamin D fact sheet for health professionals
- healthdirect: Vitamin D and your health
Sources checked 2026-10-18. Last updated 2026-10-18.