Interesting about the vitamin D. I just started taking it for this COVID stuff. Maybe it will help my tinnitus.Most Americans are Vitamin D "insufficient" I've been told. My doctor said I was "dangerously low" following my annual blood panel. It made sense because I was receiving little sun exposure due to spending most hours indoors studying for my masters. It had gotten so bad that I was having blurry vision spells and speech issues. Taking D supplements changed my life. Thinking back, I suspect I was probably deficient for years, but it wasn't until I switched PC physicians that they noticed.
Even if it doesn't cure anyone's tinnitus, probably a good idea to take it anyway. Apparently it's needed for maintaining normal hormone levels.