This also means that to get a high dose of vitamin D, you don't need to expose your skin to the Sun every day. So, if you expose your body to UV radiation from the Sun for the first time since last summer, then you can produce 25,000 IU in your skin, but by the next day only 10,000 IU will has been taken away from there, this means that with 15,000 IU still left in the skin you can only add 10,000 IU until you're back at the maximum of 25,000 IU. The maximum daily dose of vitamin D you can get from the Sun is estimated to be about 10,000 IU/day, see e.g. But vitamin D in the skin is also broken down by UV irradiation and this leads to a maximum equilibrium level of vitamin D in the skin of the order of 25,000 IU (different sources will give different figures of this maximum value, The vitamin D council says it's between 10,000 and 25,000 IU).īut this does not mean that you can get 25,000 IU per day from the Sun, because it takes a few days for the vitamin D in your skin to be transported to the liver where it gets converted to calcidiol. Vitamin D is produced in the skin by UV irradiation of 7-dehydrocholesterol.
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