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I used to pick up carob bean pods off the sidewalk.

My mother told me to drop the carob immediatly, and my mother told me that the carob beans were poisonous.

I looked up the latin name for carob beans.

The latin name is Ceratonia siliqua.

Is Ceratonia siliqua poisonous?

I saw a youtube video saying that dog treats can be made from carob.

KeyboardCat
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No, they’re not poisonous. Carob beans are edible and widely eaten, in particular as a disappointing chocolate substitute as well as a thickener (locust bean gum) derived from the seeds. Of course, some carob beans - particularly ones not intended for consumption - may have had pesticides sprayed on them.

Your mother may have been thinking of castor beans, which are quite poisonous.

Sneftel
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No, they are not poisonous. Allow me to assume that your mother was trying to say that they could be poisonous because they grow near a road and therefore can contain lead and other toxic chemicals that can do long-term damage, but could not explain. Or maybe she really thought they were poisonous.