Rx Vitamins Rx Clay powder is a pet digestive health support formula for dogs and cats. It contains finely ground hydrated calcium aluminosilicate, a geological nanomaterial that adsorbs bacterial enterotoxins and supports reabsorption of intraluminal water. This action helps regulate bowel function and normalize stool quality in pets. The easy-to-use oral powder comes in a 100 g jar and is available without a prescription, making it a smart addition to dog supplements and cat supplements for everyday digestive support.