You can consume all flavors of Hammer Gel other than Peanut Butter without concern for cross contamination. Peanut Butter Hammer Gel is produced in a completely separate facility and location than where other Hammer Nutrition fuels are produced. Additionally, when Peanut Butter Hammer Gel is run on a given day, no other flavors of Hammer Gel are run on the same day. Finally, the machinery is always sanitized several times, using a special allergen sanitation process, and whoever is working that particular shift must change clothing (including gloves, of course) and go through a sanitation process as well.