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Hello, I've been taking 5,000 IU per day, orally. My serum 25(OH)D3 has fallen, so I've increased to 10,000 IU per day. Is there a formula to work out how quickly my serum 25(OH)D3 levels will go up? Or, failing that, some rule of thumb? Thanks…. Paul

Asked by  Paul on November 16, 2015

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