In Japan, I have noticed that the ingredients list for consumable goods is quite short; presumably food producers are not required to list each and every ingredient that goes into the products they make.
In the U.S., regulations vary, but for food products, usually every ingredient should be listed. There is some leeway, as companies can gloss over some details such as "fragrance." For over the counter medicines, etc. there appears to be a distinction between active and inactive ingredients.