Chanca piedra is an herb. The whole plant is used to make medicine. Chanca piedra is used for various disorders of the urinary tract including infections, pain and swelling (inflammation), kidney stones, and discharge from the urethra or vagina. It is also used for digestive tract disorders including gas, loss of appetite, stomachache, intestinal infections, constipation, and dysentery.
Yeast extracts are the common name for yeast products made by extracting their cell contents (and removing the cell walls). they are used as food additives or flavorings, or as nutrients for bacterial culture media.