I've been doing this, I take about 15,000-20,000 iu of vitamin D3 with magnesium, and some vitamin k2 a day. I've come in contact with many people and test drove their cars during my job and I never got sick. This also might be the reason why black people in America are getting hit hard by this virus, while black people in Africa aren't...due to them having higher Vitamin D levels overall, because of more sun exposure.
15,000 a DAY? That's a lot even for a South Sudanese breh living at the north pole