I am missing results for Favipiravir that was the most promising of them all. For some reason WHO didn't include it in their test at the beginning nor at any la

I am missing results for Favipiravir that was the most promising of them all. For some reason WHO didn't include it in their test at the beginning nor at any later point of time. Almost one year later still no news?! Also, why don't the governments just distribute elderly and weak vitamin D and zinc to take everyday? There's not much harm that can be done with those and could potentially offset lack of sunlight that might have kept COVID-19 in check during the summer. A low-risk low-cost solution that could potentially yield enormous health and economic benefits if the link between vitamin D and zinc deficiency on the severe outcome of COVID-19 is proved later.