I spotted these bloodtype bath powder bags in a store during my tour with my wife in Hokkaido about two months back. The letters on these packagings should be obvious to you: they denote the different blood groups of man.
The Japanese are real advanced in health and medicalcare. There is a myriad of products customised for each unique individual based on their blood group. I have heard that one should focus his daily consumption of food types based on his or her blood group too for improved health. However it seems that this health knowledge is not prevalent in Singapore where all of us eat all kinds of food and use all kinds of products we love.