Hello; Since it keeps coming up let me say it was suggested I take the vitamin D supplement a few years ago at my doctors office. Not just because of the new virus. I also have not increased my dose of D because of the new virus. I do not know if taking D makes a difference. I am not suggesting anyone take it, just saying I have been for a few years. I agree that anyone considering taking extra ought to consult a doctor.I take a multi vitamin which has D among other things and a separate D as well. I am old and this is suggested for us older folks.
Being out in the sun is the simplest way to get D. It is metabolized when we get sunlight on our skin. My issue is sun damage over time in my youth so I tend to cover up now that I am an old man. I now wear long sleeve t-shirts, long pants and a broad brim hat in the warm months. I also use a sun block sometimes. I use to be outside a lot when younger and just got too much exposure. If you live you eventually pay for the sins of your youth.