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Amazon.com: NOW Supplements, Vitamin D-3 10,000 IU, Highest Potency, Structural Support*, 120 Softgels : Health & Household
5,000 or 10,000 IU Vitamin D for 7 years both safe and effective (4700 patients, 8 months to plateau) – Jan 2019 | VitaminDWiki
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Mega-dosing vitamin D: Doctor-prescribed 50,000 IU vitamin D may be right for some patients – Hartford Courant
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