Re: Vitamin D3 Safe Dose for Cancer Patients?

Thanks for replying, Hv!

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It would be best to not exceed 2000IU daily.
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Are you talking about 2,000 IU of active D3, so if you took 10,000 IU of inactive D3 and only 2,000 IU of that ends up getting converted into active D3 then it would still be alright?

Comparing with the recommendation in the following article, 2,000 IU seems to be very conservative.

http://www.naturalnews.com/027345_Vitamin_D_exposure_sun.html

It says, "Ideally, your blood level [of 25(OH)D as per blood testing] should be around 60-80 ng/ml, as this allows the body to have some vitamin D in reserve, and it duplicates the higher levels found in young, healthy individuals who spend a decent amount of time in a sun-rich environment." (My note added for clarity)

Now, assuming an average of 2,000 IU per 20 ng/ml and doing the math, if your blood test shows that your blood level of 25(OH)D is only 10 ng/ml, then you would need to supplement an additional 5,000 to 7,000 IU in order to get your blood level to the desired 60 to 80 ng/ml range. On the other hand, if your blood test shows a level of 50 ng/ml, then you would need to supplement an additional 1,000 to 3,000 IU to get to the ideal range. What do you think of their recommendation that 60 to 80 ng/ml is the ideal range?

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How much vitamin D a person will produce is dependent on various factors such as amount of melanin in the skin, amount of skin exposed, amount of UV light in the sunlight and length of exposure. Also keep in mind that the inactive D3 produced still has to be converted in to active D3. Simply getting sun exposure does not guarantee this. The production of vitamin D3 is dependent on a properly functioning liver and in to active D3 by properly functioning kidneys.
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Let's say you stayed out in the sun for 30 minutes and your body was able to produce 5,000 IU of active D3 from all that exposure. Would that be bad since 5,000 IU is way more than 2,000 IU that you consider safe? I would find it hard to grasp that only 30 minutes of sun exposure could be bad. Am I missing something? Is active D3 produced from sun exposure safer than active D3 produced from supplements, so you can safely have much more of the former than of the latter?

Thanks again!
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