It's weird that chemicals are added to everyday items to introduce them into more people's bodies.  For example: 

1. Fluoride is added to water to prevent tooth decay
2. Iodine is added to salt to prevent goiters
3. Vitamin D is added to milk to aid in bone health and other things

There are a few others.  It's called food fortification or food supplements, and it was invented by "the man". #food