i was just listening to the new podcast on the healthy skeptic with kurt harris and he gave a pretty lengthy answer concerning his views on vitamin D supplementation. during his answer he touched on the differences in sunlight needed for vitamin D levels to be equal in light-skinned vs dark-skinned people. it's a subject that i've been wondering about for awhile in that being that, from a study i read recently, 97% of african americans are vitamin D deficient as opposed to 60-70% of white americans. i'm assuming that this is because it the uptake of vitamin d is much quicker in white americans- i believe 15-45 minutes of midday sun is needed- whereas african americans need somewhere in the range of 2-3 hours. being that on the east coast, it's pretty impossible for me to get anywhere near adequate sunlight during the winter so i supplement 2-3000iu a day on average. my question is, being that the uptake of sunlight is drastically different from lighter-skinned people, should the darker of us supplement more D than is generally recommended?
Edit: I've been supplementing with D3 since november and this is the first winter for as far back as i can remember that i haven't been anywhere near sick, even though seemingly everyone around me has gotten sick multiple times during the winter.