I've been doing 4,000 iu/day of Vitamin D since March, also supplementing Zinc and C, and taking a standard multivitamin. My entire household got COVID in Novem

I've been doing 4,000 iu/day of Vitamin D since March, also supplementing Zinc and C, and taking a standard multivitamin. My entire household got COVID in November and I never became symptomatic.