jimmylegs wrote:heya bubba, 4000 IU is considered a long term *maintenance* dose, so that would indicate that 2000 IU is draining your levels over time.
also, what's your mineral intake like, ie calcium, magnesium, and zinc?
if you're not taking minerals with your D3 supplement your body probably won't deal with it properly.
also, i found when i corrected zinc deficiency that my body's response to D3 supplementation tripled. it was crazy.
unfortunately, hydrating with beer saps your body's zinc so you'll likely have to take extra to optimize your serum levels! ;D
anyway i'd say go with the doc's recommendation of 4000 IU/d of D3, but start paying attention to zinc levels too. see if you can get both Zn and D3 tested at the same time.
over the next while, you could see if you can get serum zinc up to 18.2-18.4 umol/L, and evaluate whether your dose response to D3 improves in step with zinc optimization.
aim for 40-50 serum D3 (or 100-150 for those who speak in nmol/L)
HTH! let me know how things pan out
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