How much vitamin D are you taking on a regular basis? Most of us have a low level to begin with. A level lower than 20 is considered to be deficient.
50,000 units of D2 is recommended once a week for 8-12 weeks, then levels are rechecked. Maintenance levels of D3 are in the 4,000 u daily. Again, it is based on your current level.
Please discuss the details with your health care professional. We have all learned of the great importance of Vitamin D from the pandemic.