White material can be a variety of things including mold, fat, or grease.
While we try to maintain our jerky as lean as possible, because we use all-natural meat, there is some variance in the fat content of each piece. During the packaging process, when the product is packed air-tight, it pulls some of the natural fat content onto the exterior surface. This is a completely normal occurrence and does happen from time to time. The product is completely safe to eat.
If you have any concerns with the product, don't hesitate to reach out to our customer service team who is more than happy to help.