how do you use vitamin c powder, vitamin e oil, or vinegar powder as a natural preservative?

How much of these individually or together would you use in a recipe to preserve cookies? I plan on baking my famous cookies to sell on ebay and locally. I hear people sometimes use vingegar powder to preserve baked goods, I also heard that vitamin c powder and vitamin e oil as well as flax seed make good natural preservatives.

For around a 4 inch cookies, how much of these should I use to extend the shelf life of my homemade cookies?

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