Just about everyone should supplement.
Unless you live south of San Diego or thereabouts, there is a good 3-6 months a year when the sun is simply not high enough in the sky for the UVB to get through.
No UVB, no Vit D.
We live in western Washington. We had only seventeen days of sunshine the entire summer, last year, and I’m betting that we have a rerun of that this year.