I hear you on how frustrating psoriasis can be! I have it all over and, like your husband, also have a vitamin D deficiency, one that is less than half of where it should be. My nurse told me that that is a big contributor in the psoriasis factor, and when other patients of hers get their D up, their psoriasis disappears. Unfortunately, raising the D level takes a while, as you know, and I haven't been able to get it past 25 (partially due to the fact that I don't always remember to take my pills and largely due to the fact that I live up North!). Someone on these boards mentioned that there is a vitamin D cream, and I think I will try that next. Please keep us posted if anything does work for your husband!