Bromelain is an enzyme complex involved in protein metabolism - a protease. Enzymes are biological catalysts involved in optimising the speed of processes throughout the body. Enzymes involved in fat digestion are called lipases, and those involved with starch digestion are called amylases. This is only a tiny proportion of the different enzyme types that are constantly active in the body, all of which are important in helping maintain a healthy lifestyle. Bromelain is not a single structure, but a composite of various enzymes, all involved with protein synthesis and all originating from pineapple.