TAT (Trypton-Azolectin-Tween®) Broth is recommended for sterility testing of viscous materials, such as shampoo, cosmetics, salves, or ointments. It is especially adapted to the sterility testing of cosmetics and pharmaceutical products, which are subject to contamination during manufacturing and use by consumers. Preservatives are used in aqueous products to make them self-sterilizing for vegetative bacteria, yeasts, and molds. Pancreatic digest of casein provides the nitrogen, vitamins, amino acids, and carbon in CRITERION™ TAT Broth Base. Lecithin neutralizes preservatives in the cosmetics or pharmaceutical products, allowing bacteria to grow. Hardy’s TAT Broth is available in many different sizes and containers.