Do your protein powder blends contain soy? Matt Mazzino, RD, LD December 07, 2021 19:55 Updated All of Gainful's products are 100% soy-free! Related articles Do you process common allergens in the same facility as your product? How do I retake the quiz or edit my answers? Can I place an order of just Flavor Boosts? Is my Personalized Protein powder okay for people with a sensitivity to oats? Is your product safe for people with nut allergies? Comments 0 comments Please sign in to leave a comment.