Potassium Sorbate?? Say What?

Potassium Sorbate is in every jar of jelly/jam in my house.  So we haven't had an PB&J.  I finally decided to look it up.  Is it natural?  If so, why the unnatural name?

Here's a video I found about some research done on potassium sorbate:
http://nutritionfacts.org/video/is-potassium-sorbate-bad-for-you/

The conclusion of the researchers is that Potassium Sorbate is a genotoxic and mutagenic compound.
Genotoxic: damaging to DNA: pertaining to agents known to damage DNA, thereby causing mutations, which can result in cancer.
Mutagenic: An agent, such as a chemical, ultraviolet light, or a radioactive element, that can induce or increase the frequency of mutation in an organism

How about PS in a positive light?

"consumption of potassium sorbate is non-toxic -- even when taken in large quantities -- and breaks down in the body as water and carbon dioxide"

Read more: http://www.livestrong.com/article/269997-what-are-the-dangers-of-potassium-sorbate/#ixzz28MRmyItf

Either way, we're not eating it.  It's synthetic.