@Molan Not saying that vitamin D doesn't have health benefits. Certainly vitamin D deficiency isn't good - with tinnitus or not. With no reflection upon you. You are just asking a question - and as a former healthcare worker I responded.
30,000+ IUs of vitamin D per day can cause many health problems. Most vitamins should also not be taken at the same time with most medications.
https://www.hearingsol.com/faq/name-vitamins-cause-tinnitus/
The IOM's safe upper limit for daily vitamin D intake is 4,000 IU. A person who ingests too much vitamin D may feel nauseated, weak and lose their appetite. Getting 10,000 to 40,000 IU of vitamin D in a day could lead to acute toxicity.
Most vitamins should not be taken at the same time with most medications.
https://vitamindwiki.com/Side+Effects+and+Warning+for+vitamin+D
https://www.easy-immune-health.com/magnesium-and-vitamin-d.html
Vitamin D Interaction With Prescription Drugs 1 Water Pills. If you are taking a diuretic, also called a water pill,... 2 Antacids. Vitamin D can increase the body's absorption of aluminum,... 3 Heart Medications. Calcium affects the heart and because vitamin D increases calcium levels.
Vitamin A toxicity, can cause nausea, vomiting, dizziness, blurred vision, hypertension crisis - organ and artery damage and poor muscle coordination.
Rare, but tinnitus may be a symptom of early hypercalcemia. The Hypercalcemia may also increase chances of coma, cardiac arrhythmias, renal insufficiency, and other serious problems. Therefore Excess of Vitamin D can cause ringing in your ears. You should take this in a limited amount.