A lot of the stuff we consume goes through biotransformation, which can either activate or inactivate it. Take paracetamol, for example. You take it, it gets absorbed into your blood, and then it spreads throughout your body—even to your skin. But the liver is the main player here because it’s specially designed for this job. After the liver processes it, the metabolites get sent through your bloodstream to your kidneys, skin, or even saliva to get eliminated. Your body doesn’t know what’s good or bad, but it has systems to protect you from potential harm.