supplement nascent iodine, b12 methylcobalamin, and D3 cholecalciferol. (avoid cyanocobalamin and lanolin- easier to avoid if you try to find "vegan" versions of these)
(Look up the long list of symptoms associated with deficiency in these)
(I found these supplements on amazon, and I felt that I found more options and better prices than what I found by walking into normal store)
(I should mention that many iodine supplements are mixed as in part ioDINE and part ioDIDE(s). I would suggest doing your own research on a fully 100% ioDINE one, vs the other. I tried to avoid mixes after what I learned from my research. Some "totally legit people" love to crawl out of the woodwork and scream "NASCENT IODINE ISN'T REAL!!!!". Well I fucking bought some and I liked it.)
In my personal experience I was getting lots of dry cracked bleeding skin and thinning of the skin all over my body, like I would brush up against something and my hands would get cut like nothing and get blood blisters and my lips and butthole would constantly get dry and crack and bleed for no fucking reason. I had some joint pain and eczema and psoriasis (very minor thank God) I also had some weird thyroid issues and my hair was falling out and I felt very weak and tired all the time and when depression hit, it would hit extra hard, like even more than usual (which was literally always, and still is, but not so sharply painful, but obviously still very painful) I'm just saying that in my own personal experience, after I took these and followed the instructions on the bottles I noticed some improvement and I'm probably going to keep it up from now on. I'm glad I discovered these, so I'm just saying- Do your own research.