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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.