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Excessive Daytime Sleepiness is Associated With Malnutrition, Dysphagia, and Vitamin D Deficiency in Older Adults - ScienceDirect
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Amazon.com: Fresh Nutrition Vegan Vitamin D3 + K2 Capsules - 5000 IU D3 + 100mcg K2 as MK-7 for Optimal Absorption - Immune Health, Bone Health, Mood - Non GMO - 90 Capsules, 3 Month Supply : Health & Household
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