OK, warfarin is not all that toxic. /s LOL
Warfarin’s toxicity is not dependent upon or conditional upon or dependent upon it being counter-indicated with grapefruit juice.
Do you think one example of a toxic compound that is metabolized by the same CYP enzyme in the liver that grapefruit juice inhibits establishes the rule that ANY compound metabolized by that enzyme must be toxic?
Is this really what you are implying?
It doesn't speak well to your competence logic or basic biological knowledge. But then again it doesn't take much qualifications to be a peddler of herbal remedies.