According to everything I have read, 2g of vitamin C is too little. For serious illness most adults would need on the order of 50 to 100 grams per day in divided doses
What I have read is all over the place. I do know that taking that much C will make what comes out the other end liquid, at random (and assuredly inconvenient times), for days. Probably shouldn’t be done proactively , and perhaps lower amounts will be helpful anyway to prevent or minimize the cytokine storm (esp. if combined with zinc and an ionophore to ameliorate the severity of the Covid).