Yes. The sun is one a very few sources of vitamin D.
I found this vitamin D supplement online.
Biotics Bio D-Mulsion
https://shop.bioticsresearch.com/products/bio-d-mulsion
Prices are all over the map but it’s fairly inexpensive considering that if you do one drop a day it’s a 2 year supply.
You just have to find a source that doesn’t cost an outrageous amount.
Each drop is 2000 IU of vitamin D, and the best thing (for me) is that *I* can even take it. It’s the first vitamin D supplement I’ve been able to take at all, much less regularly.
The taste is not the greatest, but I’ve had worse and one drop is quick and easy to get down.