Also known as: Pineapple enzyme, Ananas comosus, Stem bromelain, GDU, FIP units
Joint & ConnectiveStrong evidence
A protein-digesting enzyme from pineapple stem, used both as a digestive aid and for recovery. When you take it determines which of those two jobs it does, which is the detail most labels omit.
Typical dose
500.0–2000.0 mg per day
With meals for digestion; empty stomach for recovery and swelling
What it is
Bromelain is a mixture of protein-digesting enzymes found in pineapple, concentrated in the stem rather than the fruit. Commercial bromelain is extracted from the stem, which is otherwise a waste product.
Potency is expressed in activity units rather than milligrams — usually GDU, gelatin digesting units, or FIP units. A milligram figure without an activity figure tells you little, as with any enzyme product.
It is the reason fresh pineapple makes your mouth tingle and why it prevents jelly from setting. It is also the enzyme most commonly paired with quercetin, on the basis that it improves absorption of poorly soluble compounds.
How it works
Taken with food, bromelain acts in the digestive tract, breaking down dietary protein into smaller fragments. This is straightforward enzymatic action and is the digestive aid use.
Taken on an empty stomach, a portion is absorbed intact and acts systemically. Reported effects include influence on inflammatory mediators, on fibrin breakdown, and on the swelling that follows tissue damage.
This is why timing determines the effect entirely. Taking bromelain with a meal for recovery purposes means the enzyme spends itself on your dinner. It is the single most useful practical point about this ingredient and it appears on very few labels.
What the evidence shows
Post-surgical and post-injury swelling is the best-studied area, with a reasonable body of research, much of it European and some of it dated, reporting reduced swelling and faster resolution.
Exercise recovery research is smaller, with some trials reporting reduced soreness and markers of muscle damage after demanding exercise, and others finding little effect.
Its use as an absorption enhancer for compounds like quercetin is widely practised and less well demonstrated than the practice suggests. As a digestive enzyme for protein it works straightforwardly, though most people digesting protein normally have no need for it.
Dosing
Typical range is 500 to 2,000 mg daily, though activity units matter more than milligrams. Look for products declaring GDU or FIP.
Timing decides the effect. For digestive support, take it with meals. For recovery, soreness or swelling, take it on an empty stomach, at least 30 minutes before food or two hours after, or it will simply digest your meal instead.
This single distinction is worth more than any dosing refinement. Enteric coating is unnecessary for digestive use and arguably helpful for systemic use, though bromelain survives stomach acid better than some enzymes.
At a glance
Common forms
Bromelain powder (GDU/FIP standardised), Capsules, Combined with quercetin, Within digestive enzyme blends
Half-life / duration
Enzyme activity is short-lived; systemic effects reported over hours
Timing
With meals for digestion; empty stomach for recovery and swelling
Competition status
Permitted — not on the WADA Prohibited List
Category
Joint & Connective
Safety and side effects
Bromelain is well tolerated. Digestive upset, nausea and diarrhoea are the most common complaints, generally at higher doses.
Allergic reactions occur in people sensitive to pineapple, and cross-reactivity has been reported with latex, wheat, celery and certain pollens. Anyone with those sensitivities should approach carefully.
Because it affects fibrin breakdown, it may increase bleeding tendency, particularly alongside anything affecting clotting. It can also increase absorption of other compounds, including some medicines. Speak to your doctor before use if you take regular medication, and stop before surgery.
Who should avoid it
Avoid if sensitive to pineapple; cross-reactivity has been reported with latex, wheat and celery. Speak to your doctor before use if you take anything affecting blood clotting or any regular medication, since bromelain can increase absorption of other compounds. Stop at least two weeks before surgery.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
