Vitamin D deficiency was also shown to be a co-morbidity with COVID. So to answer the question “do multivitamins do anything?” I’d say they could potentially have saved your life and you might not have noticed.
Before COVID, my wife nagged me into establishing a primary care physician since I hadn’t gone in a while. So I did, they did a blood test, and showed that I was vitamin D deficient. I took some prescription vitamin D for like a week then my doctor told me to start taking a multivitamin. When they later announced it being a co-morbidity, I felt like I dodged a bullet.
radix