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I don't mean to be trite, but that won't work since everything is chemicals.

You also can't prove anything safe.

Good old di-hydrogen monoxide. A horribly toxic chemical.

It is the #1 cause of death in the US for ages 1-4, and #2 from 5-14.

Also, if you drink it, you will certainly die.

Surely you mean if you inhale it?

If you inhale yes, but drinking it can also lead to certain death.

Not drinking it can also lead to certain death.

Nazis and pedophiles were also avid consumers of that chemical.