People may take quercetin and bromelain together to help prevent allergy symptoms, according to Dr. Ray Sahelian. Other potential benefits of taking these supplements may include improved blood pressure and vessel health, exercise endurance, improved heart, brain, prostate, kidney and liver health.
Quercetin is a type of antioxidant, called a flavinoid, found in plants, while bromelain is an enzyme found in pineapple. Individually, they have been shown, primarily in test tube studies, to act as antihistamines and anti-inflammatories. This is why they are taken together for allergy relief.
Quercetin has been found to protect against heart disease, high cholesterol, cystitis, prostatitis, rheumatoid arthritis and possibly cancer, according to the University of Maryland Medical Center. However, most of this is based on test tube studies. The action of quercetin within the human body may be different.
Bromelain is an enzyme that seems to trigger the body to produce anti inflammatory and pain fighting substances, according to WebMD. They also state that bromelain may help with osteoarthritis when combined with trypsin and rutin. In particular, it seems to improve knee function in those with this type of arthritis.
Bromelain is also used to treat ulcerative colitis, in burn debridement, preventing water in the lungs, stimulating muscle contractions, to slow clotting, fight cancer, lose weight and shorten labor. However, there is not sufficient evidence to support the beneficial claims of these other uses for bromelain, reports WebMD.