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Vitamin D-3 (cholecalciferol) is also used as rat poison.
It makes sense. You are an industrial chemical product producer. Your process produces waste chemicals. You have to pay money to dispose of them safely. Turn that around by getting people to buy the waste chemicals.
You need to find—or invent—a use for them though. The most obvious use for harmful chemicals is poison.
Later you convince people these same chemicals are useful—vital even—for human health and get this awkward situation any time someone looks up what else your health product is used for.
Vitamin D-3 (cholecalciferol) is also [used as rat poison](https://poal.co/s/Pharma/776946).
It makes sense. You are an industrial chemical product producer. Your process produces waste chemicals. You have to pay money to dispose of them safely. Turn that around by getting people to buy the waste chemicals.
You need to find—or invent—a use for them though. The most obvious use for harmful chemicals is poison.
Later you convince people these same chemicals are useful—vital even—for human health and get this awkward situation any time someone looks up what else your health product is used for.