There are several precious metals in the human body, including gold, silver, platinum, and palladium.

Each of us has up to 0.2 milligrams of gold in our body, and most of it is found in the blood.
If there was a method to allow extracting this and other precious metals from the human body, it is estimated that mining would drastically drop, as well as using harmful artificial fertilizers. Unfortunately, scientists have not yet discovered a way to extract them.