Comments by "earthstick" (@earthstick) on "Vitamin D dose" video.

  1. This is it.
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  2. A person in the 70s produces 1/4 of the amount of vitamin D as a person in their 20s. Obese people are susceptible to vitamin D deficiency because it is fat soluble so their body fat soaks it all up. People of darker skin tone are susceptible because the melatonin blocks the sun.
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