I read a lot of marvelous stuff about vit D when I was low in it, and now there are lots of sceptics about now who are rubbishing it.
However, it is the only vitamin supplement I have ever taken (apart from iron when I was anaemic) which has made a noticeable difference. It is needed in your body system that makes use of thyroxin, and that regulates everything. I was in a situation where I knew I wasn't depressed, but mentally I just couldn't be Rsed about stuff. It helped with that within 6 weeks and it made a difference to my aches and pains (I used to go to bed to lie flat because it hurt my neck to hold my head up to read).
So I can see only good in keeping it topped up. I have tried going out in the sun more but I think that is having negative effects on my skin which is the freckly sort.
You need to make sure you are getting enough magnesium, zinc, boron and K2 in your diet to support it, so that is a good thing too. I think anything that gets you interested in healthy eating and exercise is good around menopause. It is a difficult time for many and it is easy to fall into short term comforting ways.