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doi: 10.1093/pm/pnab278 97

Immunoregulatory Mechanisms of Vitamin D Relevant to Respiratory Health and Asthma: Immunoregulatory Mechanisms of Vitamin D in Asthma

It not only measures the amount of B12 in the blood, but also checks whether your body can actually utilize the vitamin

Take them with water once or twice a day, and move one dose to the evening if you also want the sleep benefit
