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You can sell papaya seeds for $200/treatment.

Only until people find out they're papaya seeds and just go buy a papaya for $3.

That papaya might not be safe though.

Why wouldn't a papaya be safe? Everything I've seen says that the seeds are always edible.

In fact they have been used to adulterate stocks of black pepper since a long time.

Ironic comment : Drug companies tell us we can't buy their products through other countries (at much lower cost) because "safety".

Just like that?? Papaya seeds are good, but the papaya itself is not safe? — this does not make sense anyway you look at it.