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Weissman says manufacturers often promote a product's recycled content, but might not mention,for example, that it contains toxic substances.

VOA: standard.2009.03.30

Generally, people naturally dislike tastes of foods that are molding or contain toxic substances.

CNN: Is 'red' the same to all creatures?

Unlike humans, thankfully, the robot won't be (easily) killed by radiation or toxic substances.

CNN: Curiosity opening Martian frontier?

Others say it's high in toxic substances -- mercury, dioxins and PCBs -- and should be avoided.

CNN: Seafood benefits outweigh risks, government says