Pill necessary as Kevetrin leavs the body so fast a pill is needed for easy patient delivery as opposed to them being hooked up to an IV for a long period.
This is a great trait as it prevents systemic buildup of Kevetrin in the body.
K hurts no good DNA or cells and that is why it will mitigate some of the effects of current treatments that is akin to treating the body with Napalm (they kill everything including good cells).