Environmental and physical stress, age and diet can tax the immune system. Promote your body's natural defenses with Symbiotics® Colostrum® Powder. The ingredients in colostrum help maintain a strong and balanced immune defense, especially in the bloodstream and digestive tract - where your need for immune defense may be greatest. Symbiotics® Colostrum® Powder also promotes athletic performance and recovery with growth factors that support strength and stamina while promoting muscle health. Now with 25% IgG Antibodies. Gluten free.