It's proactive, not reactive treatment for a disease. It's part of being healthy in the first place, which prevents developing severe COVID, cancer, heart disease, respiratory infection, stroke, diabetes, and death. It's like a car, you give it oil and maintenance to prevent engine damage, you don't give it oil to fix engine damage.

Acting like binging on Vitamin D is supposed to suddenly cure any of those diseases is a complete misunderstanding how all this works. You can greatly reduce your likelihood of severe COVID and 100 other serious/fatal diseases through simple lifestyle changes, but they're not cures for those diseases. And fixing vitamin D deficiency shouldn't mean you take more pills, it should mean you get more exercise out in the Sun.

Also, if vitamin D deficiency is an underlying cause of severe COVID, that would explain the enormous racial inequality for hospitalization and deaths rates. All these things are linked to the amount of melanin in one's skin. The hospitalization and death rates for COVID are double for people with Native American and African blood, and both groups have much higher rates of Vitamin D deficiency.

https://www.cdc.gov/coronavirus/2019-ncov/covid-data/investi...

https://www.cdc.gov/nutritionreport/pdf/Second%20Nutrition%2...