The Short Version
Dietary fiber can support the body's elimination of certain harmful substances, but the blanket claim that it "removes toxins" overstates what the evidence shows. Peer-reviewed research demonstrates that fiber modulates the gut microbiome and supports liver and kidney function—organs responsible for detoxification—rather than directly clearing a broad range of toxins. The strongest direct evidence involves specific compounds like PFAS in a limited pilot study, which cannot be generalized to all toxins.