Is taking vitamin D once a week equivalent to taking it once a day?

It is generally recommended for people over 50 to take between 800-2000IU of vitamin D per day. However, doses up to 4000IU per day have been deemed safe. In the case mentioned, a larger weekly dose of 10,000IU was prescribed to simplify the regimen. If you prefer to take smaller doses daily, you can take multiple 1000IU capsules throughout the week to reach the same total amount. Additionally, some foods like fish, cheese, and mushrooms contain vitamin D which can help supplement your intake. Lastly, exposure to sunlight is also a good source of vitamin D.