Theoretically, the first step is to achieve optimal blood levels of vitamin D, which takes different amounts of time depending on the severity of the deficiency, the vitamin D dosage, and how each individual’s body responds to supplementing. Danielle Aberman, RDN, CHWC, and co-owner of Migraine Strong LLC, has observed that individuals can respond differently to supplementation: “Monitoring is important, as some people easily increase levels while others need higher daily or weekly doses to get their vitamin D level to budge.”