In case of over temperature because of directly cooking with charcoals, the nutrients will be decayed or burnt during boiling and concentrating process; it can produce unwanted by-products that cannot be controlled.

The process of manual cooking will produce extract products of glue form, so some production facilities will add more horse skin to increase the adhesion, and to be convenient for shaping extract glue.

It is difficult to control the stability of quality because the specifications in the cooking process are not controlled.

Due to the high nutrients content of horse bone extracts, it is also a very favorable environment for growth and parasitic of bacteria, molds. Traditional cooking environment does not meet hygienic standards to prevent bacteria and molds.