I had taken care of patients with acute disseminated encephalomyelitis (ADEM) post influenza infection. His neuro symptoms included sz, confusion. On routine

I had taken care of patients with acute disseminated encephalomyelitis (ADEM) post influenza infection. His neuro symptoms included sz, confusion. On routine testing by the dietitian he was noted to have a very low vitamin d level. Although very anecdotal- I have always believed that autoimmune conditions post viral syndromes are exacerbated by low vitamin D levels. Have any you with long covid been tested for vitamin D levels? For any of you did vitamin d supplements help?