Aids in digestion. Helps combat hyperacidity. Bird Gravel is a vitally important digestive and hygienic aid for all Parakeets, Cockatiels, Lovebirds, and Parrots. Gravel is nature's substitute for a bird's teeth. Bird Gravel also contains oyster shells, a natural from of grit, and charcoal, which combats hyperacidity and sweetens the stomach. Bird Gravel is washed and processed for perfect cleanliness. Serving your pet product needs for over 100 years! Product of India.