Cinnamomum cassia component called coumarin, which could damage the liver if consumed in larger amounts, European health agencies have warned against consuming high amounts of cassia. Other bioactive compounds found in the bark, powder and essential oils of "C. cassia" are cinnamaldehyde and styrene. In high doses these substances can also be toxic for humans. Cinnamomum cassia Cinnamomum cassia, called Chinese cassia or Chinese cinnamon, is an evergreen tree originating in southern China, and widely cultivated there and elsewhere in southern and eastern Asia (India, Indonesia, Laos, Malaysia, Taiwan, Thailand, and Vietnam). It is one of several species of "Cinnamomum" used primarily
Cassia marksiana Cassia marksiana Cassia marksiana, Marks cassia, is an Australian rainforest tree growing in far north eastern New South Wales and in south eastern Queensland. The common name is in honour of Dr. C. F. Marks, an early botanical collector. Other common names include cigar cassia, brush cassia, and native laburnum. The Brunswick River is considered the southernmost point of natural distribution. Its habitat is seaside and lowland subtropical rainforest, which is almost completely destroyed, with only small remnant patches remaining. Less than 100 trees are known to exist in the wild in some 20 locations. Consequently, it is listed as