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 Is your product safe for people with nut allergies? Are Your Flavor Boosts Keto Friendly How do I gain weight? Do your shakes include fruit and vegetable nutrients? Do you have any protein powder options that do not contain whey? Comments 0 comments Please sign in to leave a comment.