I want to point out something that some people may interpret as a "miracle cure"; it is definitely not. Having said that, I cannot overemphasize the benefits of taking Vitamin D as a preventative measure. I cannot speak for Brazil, but I know in America, 40% of the population is deficient in Vitamin D. One of the main features of this vitamin is the role it plays in reducing inflammation; and you'll see one of the main problems with covid is how it causes inflammation throughout the body's systems. Whats more, in America of the African-American population 60% are deficient in vitamin D, while in Hispanic populations it's around 80% deficient. Which two groups have been hit hardest by Covid? This was backed up by a study done in Madrid, Spain, and published in a medical journal there. A doctor noted that many of the patients coming to the hospital for covid were deficient in vitamin D. So, as a test, he took 74 patients of varying ages and conditions, all deficient in vitamin D. 50 of them he gave massive doses of vitamin D to bring their levels up to normal, then continued smaller doses to maintain the proper level; the remaning 24 did not get extra vitamin D. ALL of the 24 who did not get the vitamin D required intensive care intervention (intubation, etc.); of the 50 who got the vitamin D only 1 required intensive care. Administering vitamin D has now become a standard procedure upon admission to that hospital. When I had covid back in March of last year, it lasted the standard 10 days before I felt better, however, my throat was still raw and I could only talk for about 10 minutes before my voice shut down. I had read an article some time before about how men of my age should take extra vitamin D, so I got some and started taking one pill (about 1,000 units) each day. By the 3rd day the inflammation had gone down and I had my voice back. About that time I had a doctor's appt. and I asked them to do a vitamin D serum to be sure. A few days later they called back -- after two weeks of taking the extra vitamin D my levels were down, and they wanted me to take more! So now I take 2,000 units per day.