However, Brissette says that taking your vitamin D with a meal can help. "Take your vitamin D supplement with a meal that ...

For example, Andrews explains that people with vitamin D levels of 12 ng/mL (30 nmol/L) may need a prescription dose of 50,000 IU of vitamin D once per week, or 4,000 IU daily for six to eight weeks.

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The NHS also warns that taking more than 100 micrograms (4,000 IU) per day could be harmful, and too much vitamin D over a long period of time can cause too much calcium to build up in the body ...