Potassium sorbate is a type of food preservative. It helps prevent the growth of harmful bacteria and fungi in food, which can make it last longer and stay fresh. Full definition
This includes potassium that has been added to food fortified for health reasons, potassium chloride - based sodium replacers, preservatives such as potassium sorbate or naturally occurring potassium in foods such as bananas, avocados and beans. (foodnavigator.com)
I've never added potassium sorbate to anything, and don't think these hotdogs need it. (blog.fatfreevegan.com)
They're actually SUN dried, and have no nasty sulfur dioxide (or other gross preservatives like potassium sorbate). (keepinitkind.com)