Plucking a raw olive from a tree and eating it won’t hurt you, but you probably won’t love the taste of it.
Unprocessed olives contain high concentrations of oleuropein, which makes them taste bitter. It turns out that oleuropein has some heart and brain health benefits and the only food-based source of it seems to be olives. Still, rather than suffering through raw olives, you can just buy the supplements to reap all the potential benefits.
Next: The poisonous versions of these are identical to the safe ones.