Promotes regularity Provides digestive support Free of gluten, dairy, nuts, salt, and artificial colors or flavors A healthy, well-rounded diet should include both insoluble and soluble fiber. The Vitamin Shoppe? brand Fiber Blend combines all 6 soluble and insoluble fiber groups?cellulose, pectin, gums, mucilages, hemicellulose, and lignin?to support healthy digestion and promote regularity. Frequently Asked Questions What's the difference between soluble and insoluble fiber? Soluble fiber is fiber that dissolves in water, while insoluble fiber doesn't.