Hi Pete! Kevetrin has proven to ne non-genotoxic but that doesn't mean nontoxic. It is still cancerkiller - heavy duty med - and it's likely people will know they're on it. It may have some toxicity on the liver or not. It may have temporary, uncomfortable side effects such as nausea, vomiting, diarrhea without negatively affecting liver. That is the most likely scenario in my mind - that it may feel like a chemo drug but cause only transient negative effects - unlike traditional chemo agents that can cause lifelong adverse effects. They can't modify the molecule at all or else it will be considered a different medication by the fda and they have to start from preclinical scratch.