What Is Vitamin D In International Units & What Foods Can I Find It In?
Here you can read about what vitamin D is, both D2 and D3, measured in International Units (IU).
Vitamin D exists in two forms, Vitamin D2 and Vitamin D3. Despite its name, vitamin D is not a vitamin. It is a hormone that can be synthesized by sunlight.
It is fat-soluble vitamin, which means that the body does not need these every day. We have the potential to store it in our bodies.
Table of Contents
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Vitamin D2 And Vitamin D3
Vitamin D exists in two forms. Vitamin D2 and Vitamin D3. (src ◳)
There are a few differences between the two D vitamins. You can read more on Vitamin D, D2 and D3.
It's difficult for people to get enough vitamin D from food alone.
Supplements are an alternative, but taking too much vitamin D supplements over a long period can cause too much calcium to build up in the body.
So be careful and take the right amount.
International Units
IU stands for International Units. It is a unit of measurement for vitamins and other specific substances.
It is commonly used to measure fat-soluble vitamins, like Vitamin A, D, and E.
Vitamins are measured in milligrams, micrograms, or international units.
Milligrams and micrograms show the amount of mass in a sample.
But international units show the level of biological activity of the substance. (src ◳)
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Vitamin D Unit Conversion
Vitamin D in International Units is calculated by multiplying the serum 25-hydroxyvitamin D level by 2.5.
25-hydroxyvitamin D is the most abundant form in human serum and is considered to be the bioactive form of vitamin D.
Conversion between international units and micrograms is easy with or without a calculator. (src ◳)
How to convert Vitamin D International Units to micrograms
To convert Vitamin D from International Units to micrograms all you have to do is multiply IU with 0.025 or if you don't have a calculator, divide the IU with 100 and then multiply it with 2.5.
Examples international units to micrograms
International units: 400 IU
- With a calculator
- 400 IU * 0.025 = 10 mcg
- Without a calculator
- Step 1: 400 IU/100 = 4
- Step 2: 4 * 2.5 = 10 mcg
International units: 1000 IU
- With a calculator
- 1000 IU * 0.025 = 25 mcg
- Without a calculator
- Step 1: 1000 IU/100 = 10
- Step 2: 10 * 2.5 = 25 mcg
How to convert Vitamin D micrograms to International Units
To convert Vitamin D from micrograms to International Units all you have to do is multiply the mcg with 40.
Examples micrograms to international units
Micrograms: 10 mcg
- 10 mcg * 40 = 400 IU
Micrograms: 25 mcg
- 25 mcg * 40 = 1000 IU
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Foods You Can Find Vitamin D (D2 + D3), International Units In
You find Vitamin D (D2 + D3), International Units mostly in fats and oil, vegetable, seafood, and american indian and alaska native food products.
Examples of food sources include
- Cod Liver Fish Oil
- Mushrooms
- Portabella Mushrooms
- Maitake Mushrooms
- Halibut
- White Mushrooms
- Mackerel
Foods in our nutrition tool
You can find regularly updated top-ranked lists of foods for over 200+ nutrients in our nutrition tool.
If you are interested in what foods contain the most Vitamin D (D2 + D3), International Units, we recommend you visit our tool.
Here's our top-ranked list of foods that contain Vitamin D (D2 + D3), International Units.