My partner had some memory issues and such. I gave her neurologist and article about high does of Vitamin D3 that showed it might help. He said that was a good idea and to go on and try it. We had some good results from it and she actually got better.
I had her on like 5000 to 10,000 units a day for along time. At a check up her D test was 114 and normal is 80 so I cut her back, but still kept her level at close to 80. She never got sick and when Covid came we were both on the High Vitamin D3 level and we didn’t get Covid either. I keep my level at close to 70.
You may find this interesting...esp coconut oil idea. You need fat with D3 supplementation.
https://freerepublic.com/focus/f-news/4351535/posts