Bromelain in animals: inflammation and digestion
Bromelain in dogs: what does the evidence say about anti-inflammatory effects and digestion? Honest assessment, weak evidence, safety info.
Short & honest
Bromelain has proven anti-inflammatory properties in the lab, but direct veterinary studies in dogs as monotherapy are lacking. The available evidence is weak (grade C).
Safety assessment: Safe when used correctly
Veterinary review not yet completed
This page is awaiting review by a registered veterinary surgeon. Until then, treat the text as education based on the sources listed — not as a verified veterinary judgement.
What is bromelain?
Bromelain is a mixture of proteolytic enzymes derived from the pineapple plant (Ananas comosus). It is traditionally used for its purported anti-inflammatory and digestive-supportive effects. Some research exists in human medicine; in the veterinary context, the evidence is limited.
What do manufacturers and therapists claim?
Bromelain is most often recommended for:
- Joint and muscle problems — osteoarthritis, muscle pain after exertion
- Postoperative swelling and pain
- Digestive complaints — support of protein breakdown, bloating
For none of these indications in dogs does sufficient direct evidence exist.
What does the evidence say?
In the laboratory, bromelain demonstrably inhibits prostaglandin E2 and COX-2, two mediators of inflammation. However, laboratory results do not always translate into clinical efficacy in living animals.
In dogs, one randomised controlled study containing bromelain exists [1]. In this study, 30 kennel dogs received a combination supplement of bromelain, quercetin and shiitake. Faecal calprotectin decreased by 45% and cortisol levels by 36% compared with controls. The study was methodologically reasonably designed, but has a crucial limitation: it concerns a combination product. The contribution of bromelain to the observed effects cannot be determined. Studies on bromelain as the sole active substance in dogs are lacking.
In cats, a well-designed double-blind RCT found no significant analgesic or anti-inflammatory benefit of bromelain over placebo after ovariohysterectomy [2]. This negative result in a closely related species confirms that in vitro activity does not automatically translate into clinical practice.
The combined picture: interesting in vitro, insufficiently demonstrated in vivo in companion animals.
Safety
At normal doses, bromelain is generally well tolerated. At higher doses, the following may occur:
- Gastrointestinal disorders (nausea, vomiting, diarrhoea)
- Prolonged bleeding time due to anti-platelet activity
Do not give bromelain to animals with a known pineapple allergy, or to animals already using anticoagulants or NSAIDs due to the increased bleeding risk.
Practical advice
Always discuss bromelain with a veterinary surgeon before administering it, especially if the animal is using other medication or has an upcoming procedure. A veterinary surgeon can assess whether the supplement is suitable for the specific situation and can advise on an appropriate dosage.
Why this verdict?
The available evidence consists of one RCT in dogs using a combination product—the contribution of bromelain alone cannot be isolated within it [1]. A well-designed RCT in cats showed no significant benefit over placebo [2]. Monotherapy studies in dogs are completely absent, which justifies a grade-C verdict (weak evidence).
Interactions with medication
- NSAIDs (e.g. meloxicam, carprofen): increased bleeding risk when combined
- Anticoagulants (e.g. heparin): increased bleeding risk when combined
Legal status (Netherlands)
In the Netherlands, freely available as a dietary supplement; not a registered veterinary medicinal product.
Sources
- [1] A Supplement with Bromelain, Lentinula edodes, and Quercetin: Antioxidant Capacity and Effects on Morphofunctional and Fecal Parameters in Kennel Dogs. Veterinary Sciences (MDPI), 2023. RCT doi:10.3390/vetsci10080486
- [2] Bromelain does not provide significant analgesic and anti-inflammatory benefits over placebo in cats undergoing ovariohysterectomy. Journal of the American Veterinary Medical Association (JAVMA), 2023. RCT doi:10.2460/javma.23.02.0117
Questions about this substance for your animal?
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