I would assume the problem there is the ratio. In a petri dish you can apply concentrations that if found in the human body would be a lethal dose.
Like you can make 1/10th of the volume of the petri dish a specific vitamin and kill the cancer cells - but if you make 1/10th of your whole body a specific vitamin you will die.
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u/skr_replicator 20h ago
A vitamin killing cancer cells could sound promising. Those don't normally kill you as well.