You often take medication. Some antibiotic for that relentless infection, or something mild to counter an incessant flu. An antiviral or antiretroviral. A prescription for malaria. If you have children, they will most likely have been vaccinated against some of the most dreaded diseases, and your kitchen cabinet has one or two syrups for the baby — just in case.
Now, imagine what all those efforts, what all those trips to the chemist shop round the corner, would mean if the pills and syrups did not contain an active ingredient — the vital component of a drug that cures, treats or prevents disease.
Even worse, imagine the danger you would be exposing yourself and your child to if those pills and syrups contained toxic substances that could harm your health and endanger your life.