Quercetin: a natural ally for the prostate

The health of the prostate is a central issue in preventive medicine and quality of life for men, especially as they get older.

Among the many natural substances studied for their therapeutic potential, the quercetin has attracted the attention of the scientific community for its anti-inflammatory and antioxidant properties.

This flavonoid, found in many plant-based foods, has been shown to be particularly effective in counteracting the symptoms of chronic prostatitis and modulating the cellular processes involved in the development of prostate cancer.

Interest in quercetin stems not only from its efficacy, but also from its natural origin and the possibility of easily incorporating it into the daily diet or through targeted supplements.

What is Quercetin

Quercetin is a natural compound belonging to the flavonoid family, plant pigments responsible for the colour of many fruits and vegetables.

It is one of the most abundant flavonoids in the human diet and is found in many common foods.

Its chemical structure gives it antioxidant and anti-inflammatory properties, making it the subject of growing scientific interest for the treatment and prevention of various diseases, including those affecting the prostate.

Mechanisms of action

Quercetin acts on several fronts. Firstly, it is a powerful antioxidant: it neutralises free radicals, unstable molecules that damage cells and promote chronic inflammation. In addition, it has a direct anti-inflammatory effect as it inhibits enzymes and chemical mediators involved in inflammatory processes.

This is particularly relevant for the prostate, an organ prone to persistent inflammation, especially with advancing age.

Quercetin has also been shown in preclinical studies to have anti-cancer properties. It can induce apoptosis (programmed cell death) in cancer cells and inhibit their proliferation. Although these effects are still being studied, they represent an interesting prospect for the prevention of prostate cancer.

Food sources

Quercetin is present in many everyday foods.

Red onions, particularly in the outer layers, are an excellent source. Also capers, apples, grapes, berries, celery, cabbage, tomatoes and green tea contain significant amounts of it.

Interestingly, the red wine, due to the fermentation process, concentrates quercetin more than white wine.

Consumption of these foods, especially when combined with fats or carbohydrates, can improve intestinal absorption, which is otherwise rather limited.

Capers	181 mg	More concentrated source; often consumed in small quantities
Red onions	33-56 mg	Higher concentration in the outer layers and if organically grown
Apples (with peel)	4-44 mg	Fuji variety: approx. 2.3 mg; other varieties up to 4.0 mg
Red grapes	3-15 mg	The peel contains most of the quercetin
Berries	3-15 mg	Blueberries, blackberries, raspberries; varies according to species
Celery	3-5 mg	Moderate quantity; useful in combination with other foods
Cabbage	7-10 mg	Broccoli and green cabbage are good sources
Tomatoes	1.6-3.3 mg	Organic tomatoes contain up to 79% more than conventional ones
Green tea	2-10 mg	Varies according to quality and preparation
Red wine	3-5 mg	Higher concentration than white wine

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Integration and bioavailability

Despite its abundance in food, quercetin has a relatively low oral bioavailability. For this reason, specific supplements, often combined with bromelain, vitamin C or liposomal formulations, are available to improve its absorption.

Doses used in clinical trials vary from 250 to 1000 mg per day, generally for cycles of several weeks. It is important to follow the instructions of a health professional, especially in the presence of other drug therapies.

Quercetin and prostate health

Quercetin is particularly useful in the treatment of chronic non-bacterial prostatitis, an inflammatory condition that can cause pelvic pain, difficulty urinating and sexual discomfort. Several studies have shown a significant reduction in symptoms in patients treated with quercetin, due to its anti-inflammatory and antioxidant action.

In the field of oncology, quercetin is studied for its potential role in the prevention of prostate cancer, although it is not yet recommended as a specific treatment. However, its use as an adjunct in integrative protocols is promising.

Side effects and contraindications

Quercetin is generally well tolerated, but at high doses it can cause side effects such as nausea, headache or, rarely, kidney damage. It is not recommended when taking anticoagulant drugs, such as aspirin, or quinolone antibiotics, with which it may interact negatively.

It is always advisable to avoid prolonged use without a break and to consult a doctor before starting supplementation, especially in the presence of chronic diseases or drug therapies.

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Quercetin is a valuable natural ally for prostate health, especially in cases of chronic inflammation. Its antioxidant and anti-inflammatory action is well documented, and dietary sources are readily available. However, supplementation must be carefully evaluated, taking into account bioavailability and possible drug interactions.

In the context of integrative and personalised medicine, quercetin may offer significant benefits, but it should not be considered a panacea. Research continues to explore its potential, and its role in cancer prevention may become increasingly relevant.

References: https://www.spandidos-publications.com/10.3892/or.2015.3886
https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2023.1077531/full