Vitamin C Powder

How many of these individually or together Would you use a recipe to preserve cookies? I intend to baking my famous cookies to sell on eBay and local. I hear people sometimes use powder vingegar to preserve bakery products, I also heard that oil vitamin C powder and vitamin E and flaxseed repair natural preservatives.

Since approximately one inch four cookies, how do I use these to extend the life of my homemade cookies?

You may be better to use a large vacuum packaging. There are versions pretty cheap house available.