Bromelain is derived from the pineapple plant, and is actually one of a group of enzymes that digest protein. It is actually the stem that is the richest source of Bromelain, not the fruit, as some manufacturers would have us believe. When used in combination with other enzymes, it may help to aid digestion in those who are suffering from mild stomach upset.
It is often used to treat muscle injuries and as a digestive aid. There is evidence to suggest that bromelain may enhance immune function. Barth et al found that bromelain activates macrophages (a type of white blood cell that protects the body against infection) and has positive effects on other factors. The results of the study led the authors to conclude: “…[bromelain] may stimulate, therefore, the innate as well as the adaptive immune system.” Other research has shown that bromelain also activates natural killer cells (a type of white blood cell that destroys tumor cells and cells infected with certain organisms).
An even more common use for Bromelain is the reduction of inflammation. It is often applied topically in the form of a cream to minor abrasions, sprains, and even frostbite. These anti-inflammatory benefits also make this ingredient helpful to those suffering from sinusitis.
Bromelain may also enhance the effect of the antibiotics amoxicillin, erythromycin, penicillamine, and penicillin. In a study of people with urinary tract infections, 100% of participants given antibiotics in combination with bromelain and another enzyme called trypsin were cured of their infection, compared with just 46% who received antibiotics alone.* | 
