Asian black and brown bears, found mostly in mainland China and North Korea, are the biggest source of gall. Because both places have a tradition of using bear gall in medicines, they long ago began raising bears in captivity and attaching tubes to extract their gall, producing so-called "drainage gall."
此外，熊膽最大宗來源是亞洲黑熊與棕熊，主要產地大陸與北韓，由於都有以熊膽作藥材的傳統，多年前就進行人工養殖，以導管引流活熊膽汁，生產所謂的「引流膽」。