Vitamin D infographic by Natural News
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Dr. Heaney, a D researcher, suggests 75iu D3/kg/day as a dose planning guide.
However he also notes a 6 fold variability among folks taking D re serum levels.
Latitude,
altitude,
weather,
age,
skin color,
diet,
genes,
lifestyle,
obesity,
cofactors,
drugs,
diseases,
etc. all affect D uptake/utilization.