Except for the flowers and ripe berries (but including the ripe seeds), all parts of the plant are poisonous to mammals, containing the cyanogenic glycoside sambunigrin (C14H17NO6, CAS number 99-19-4).
The only non-toxic components of the plant are flowers and fully ripe berries; however, all other parts pose a threat to mammals, comprising the cyanogenic glycoside sambunigrin (C14H17NO6, CAS number 99-19-4).