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Initial phase

Treating vitamin D deficiency depends on the severity of the deficit.[63] Treatment involves an initial high-dosage treatment phase until the required serum levels are reached, followed by the maintenance of the acquired levels. The lower the 25(OH)D serum concentration is before treatment, the higher the dosage that is needed to quickly reach an acceptable serum level.[63]

The initial high-dosage treatment can be given on a daily or weekly basis or can be given in form of one or several single doses (also known as stoss therapy, from the German word Stoß, meaning "push").[64]

Therapy prescriptions vary, and there is no consensus yet on how best to arrive at an optimum serum level. While there is evidence that vitamin D3 raises 25(OH)D blood levels more effectively than vitamin D2,[65] other evidence indicates that D2 and D3 are equal for maintaining 25(OH)D status.[63]

Supplement

Vitamin D2 supplements
In the United States, the Food and Nutrition Board at the National Academies of Sciences, Engineering, and Medicine has established Recommended Dietary Allowances and Adequate Intakes for vitamin D. These values range from 15 to 20 mcg (600–800 IU) for adults and from 10 to 15 mcg (400–600 IU) for infants, children, and adolescents, depending on age.[61] The Canadian Paediatric Society recommends that pregnant or breastfeeding women consider taking 2000 IU/day, that all babies who are exclusively breastfed receive a supplement of 400 IU/d, and that babies living north of 55°N get 800 IU/d from October to April.[62]

Sun tanning
Further information: Sun tanning
Light therapy
Main article: Light therapy § Vitamin D deficiency
Exposure to photons (light) at specific wavelengths of narrowband UVB enables the body to produce vitamin D to treat vitamin D deficiency.[60]