I do not add any preservatives, these will last several weeks in an airtight container and can also be frozen.
I hope you will give these a try, they are a great treat in the morning. You will receive a 1/4 lb. If you decide that your dog really likes them, I can set up a listing for a one pound bag at $8.00.
Note: I will ship internationally, however please convo me for the correct shipping charges.