What is a desired loading regimen for vitamin D?

A loading regimen for vitamin D usually refers to a therapy in which people are given a very high dose of vitamin D to bring up their blood levels quickly, followed by much lower doses of vitamin D to maintain healthy vitamin D blood levels. Such a regimen is sometimes tried in elderly people whose blood levels of vitamin D are very low and who are at risk of bone fractures.

In one study, doctors in the Netherlands developed a regimen in which the loading dose was determined by multiplying a person's vitamin D level of deficiency by their body weight in kilograms, and then multiplying by the number 40. Other researchers have tested giving people a single dose of 50,000 or 100,000 international units (IUs) of vitamin D as a "jump-start," followed by daily doses of 1,000 IUs of vitamin D to maintain healthy vitamin D blood levels.

It is pretty common practice to use a loading regimen in clinics. Some doctors use 50,000 units a week for 8 weeks, and then drop down to a maintenance level of 1,000 units per day. So yes, that is commonly done, and is a good idea for really deficient people so that it does not take months to get their vitamin D levels corrected. If you were to just go straight to maintenance it would be 3 months before you would bring the blood level up to the desired level.

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