Recommended Dosage for Vitamin D3

Vitamin D3, also known as cholecalciferol, is the preferred supplemental form of vitamin D because it is generally more effective than vitamin D2 at raising and maintaining serum 25-hydroxyvitamin D levels.

For most healthy adults, a standard maintenance dose typically ranges from 600–800 IU per day, depending on age and baseline vitamin D status. However, in clinical and wellness settings, 1,000–2,000 IU per day is commonly used to support adequate vitamin D levels, particularly in individuals with limited sun exposure, darker skin pigmentation, higher body fat levels, indoor lifestyles, or increased risk of deficiency.

The generally accepted tolerable upper intake level for adults is 4,000 IU per day unless otherwise directed by a healthcare provider.

Vitamin D Blood Levels

Vitamin D status is assessed through a blood test measuring 25-hydroxyvitamin D [25(OH)D].

Common reference ranges include:

Dosage for Vitamin D Deficiency

For individuals with confirmed vitamin D deficiency, higher therapeutic doses may be used short term under the direction of your healthcare provider. Common clinical protocols may include 10,000 IU per day or 50,000 IU once weekly for a limited period, followed by a maintenance dose once blood levels normalize. Typically, 10,000 IUs every 2-3 days. 

How to Take Vitamin D3

Vitamin D3 is best absorbed when taken with a meal that contains dietary fat, or a supplement encapsulated in fat, like Swolverine's Vitamin D3 which is suspended in Olive Oil. Adequate magnesium status is also important, as magnesium plays a role in vitamin D metabolism and activation.