The original, #1 desert substrate is made from pure calcium carbonate. The patented formula utilizes FDA approved pigments to provide 11 colors and blends to choose from. Calci-Sand is designed for the incidental ingestion of the substrate by reptiles. CalciSand is not intended to be a supplement, rather a great alternative to play sands and other desert substrates. Calcium sand is a great bedding for most reptiles except baby lizards or baby geckos.