@byurose Have you had time to research benefits of Vitamin D on line.
Vitamin D helps in many ways but is most important, from many of our understandings, with the lungs in general and helping with infections.
If I am not mistaken many who we lost during Covid were found to have low vitamin D levels, per their findings in looking for answers with the Covid patients.
Glad you are taking Vitamin D but surprised if you haven't had your doctor, be it primary care doctor or other, test for your levels since you apparently have BE?
For myself due to my history with low D I take 10,000 IU nearly 4 times a week. So far for 10 years of taking that much my D level has never been too high when tested.
Barbara