What is insulin made of?
Insulin takes baker's yeast, sugar, water and air directly. Trace them back and you pass 4 made things on the way to 5 raw materials.
How insulin is made See it on the map
What goes straight in
From the ground: 5 raw materials
Made along the way: 2 things
Chemicals and fuels 1
Food 1
What it is packed in
On the line, but left out of everything above, because it holds the finished thing rather than goes into it.