Bromelain

Bromelain is the collective name for a group of proteolytic, protein-digesting enzymes found in the pineapple plant (Ananas comosus), a member of the family Bromeliaceae. Chemically, its main components are cysteine proteases, sometimes called sulfhydryl proteases because they depend on a free thiol group to function ^[1][4]. The enzyme was first isolated from pineapple in the late nineteenth century, and today two principal forms are recognized, stem bromelain and fruit bromelain, which differ in their enzyme makeup and are produced by different methods ^[4].

Bromelain has a long record of culinary use as a meat tenderizer and industrial use in baking and other processes, but it is best known to consumers as a dietary supplement. Reviews of the scientific literature describe a range of studied effects, including anti-inflammatory, anti-edema (swelling-reducing), fibrinolytic, and antithrombotic actions, along with exploratory work in cardiovascular disease, sinusitis, osteoarthritis, and cancer ^[1][3][4]. A systematic review of laboratory studies reported that bromelain lowered the secretion of pro-inflammatory signaling molecules such as IL-1beta, IL-6, and TNF-alpha in stimulated immune cells ^[2].

Despite this broad interest, rigorous clinical proof remains limited for most proposed uses. The one clearly established medical application is as a debriding agent; a bromelain-based preparation is approved in Europe and elsewhere for removing dead tissue from deep or partial-thickness burns. For other indications, bromelain is generally sold as an over-the-counter dietary supplement rather than an approved drug, and standardization can vary between products ^[1][3].

Bromelain is commonly available as capsules, tablets, and powders, and it is sometimes combined with other enzymes or with anti-inflammatory nutrients. Enzyme activity is often expressed in specialized activity units rather than by weight, and the enzyme keeps much of its activity across a range of temperatures, though high heat gradually reduces it ^[4].

Generally well tolerated. Common side effects are mild GI upset, nausea, and diarrhea. Because it has fibrinolytic activity, it can increase bleeding risk, so caution with anticoagulants and before surgery. People allergic to pineapple, latex, or certain pollens may react to it.

Bromelain may increase bleeding risk when taken with warfarin and other anticoagulants ^[15]. The exact mechanism and degree of clinical significance remain unclear, and most supporting evidence comes from in vitro studies and case reports rather than controlled trials ^[15]. Antiplatelet drugs like aspirin and NSAIDs have not been formally studied with bromelain; these combinations remain understudied.

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