Recent Hair Issue

Recently learned I am Vitamin D deficient.  Due to covid, a lot more people are probably deficient from staying indoors a lot more.  Anywho, doc prescribed supplements.  I am starting to wonder if this had anything to do with my hair recently going very dry and falling out.  I also had a recent scalp psoriasis flare up.  Add stress to that and I'd think that's some pretty good causes for my hair suddenly changing.  Oh, and also add that I pretty much stopped eating red meat.  Now it all makes sense.

Hopefully, the Vit D supplements help, along with walks outside during the week.  I was taking a hair, skin, nail biotin supplement, but I am looking into taking collagen instead, to make up for not eating much beef and chicken.

Any suggestions, advice, thoughts?