The use of formalin and other dangerous preservatives in food has been serious problem for three reasons. firstly, formalin is not for human beings, but it is for biological specimens and experiments. formalin in biology is a 10% solution of formaldehyde in water which is usually used as a disinfectant or to preserve biological specimens. thus, it is not for food preservatives. of course when it is used for food preservative, it will be very dangerous to human’s body. the second reason is that there is no tight control from the government. this condition makes the people’s health is really in a threat. when the control is weak and the use formalin was spread wide all over the indonesian regions, and these days it has really happened, the citizen’s bodies will be badly contaminated with the poisons. fish or food traders still sell their products which contain formalin and dangerous preservatives. can you imagine that our digestive system absorbs the substance that should be for the human and animal corpses? considering the reasons, we can make a conclusion that the use of formalin and other preservatives is really a serious problem if it is not resolved immediately. why is formalin dangerous for human`s body?