For vitamin D deficiency, taking generic cholecalciferol (vitamin D3) is highly effective. To safely correct a deficiency, a doctor typically prescribes a high weekly dose (such as 50,000 IU) for 6 to 8 weeks, followed by a daily maintenance dose of 1,000 to 2,000 IU. Since vitamin D is fat-soluble, the best time to take it is with your largest meal of the day, such as breakfast or dinner, to maximize absorption. Please consult your physician to check your blood levels and get a personalized prescription.
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