5 Best Quercetin Supplements 2024: Top Brand Reviews

Whether you’re on a vegan diet or not, vegetables and fruits should be a staple. These foods are packed with nutrition; the more colorful they are, the healthier they are. 

Foods get their color from phytochemicals – natural bioactive compounds that provide numerous health benefits. Flavonoids are a class of phytochemicals that support the immune system and neurological health. These are divided into subclasses including flavonols, flavones, flavanones, and isoflavones. 

Flavonols like quercetin^[1] have strong anti-inflammatory and antioxidant properties. They protect the cells from damage and may help prevent neurodegenerative disease, diabetes, cancer, and heart disease.

Benefits Of Quercetin Supplements

Taking quercetin supplements may help alleviate allergy symptoms^[3] and support respiratory health, relieve inflammation^[4], reduce blood pressure, and may aid the success^[5] of chemotherapy. It may also reduce your risk for chronic brain disorders like Alzheimer’s and dementia^[6]. 

The health benefits of quercetin may be heightened by combining it with other supplements or compounds. Digestive enzymes, for example, can increase the absorption of quercetin. Zinc with quercetin supplement may boost the antiviral benefits of the zinc supplement. Other flavonoid-rich supplements may go well with quercetin too. 

Quercetin supplements are available in both pill and capsule form, generally ranging from 250 milligrams (mg) to 500 mg per serving. Taking quercetin is generally regarded as safe^[7] for use up to 12 weeks in doses up to 1,000mg per day. It’s always wise to consult your physician before taking any supplements regularly. 

With so many options on the market, it can be overwhelming to choose a quercetin supplement yourself. Below we’ve reviewed our five best quercetin supplements to help you get started.

5 Best Quercetin Supplements in 2024

Natural Sources vs. Quercetin Supplements 

Fruits, vegetables, and whole grains are some of the richest sources of nutrition on the planet. These foods contain essential vitamins and minerals as well as other beneficial plant compounds like antioxidants, flavonoids, and polyphenols. 

Quercetin is a type of flavonoid known for its antioxidant properties. Flavonoids like this help the body fight against damage caused by free radicals which may contribute to a reduced risk for chronic diseases like diabetes, heart disease, and neurocognitive decline. The human body does not produce quercetin on its own, so you can only gain these benefits by including quercetin in your diet. 

Here’s a quick overview of the top 5 quercetin-rich foods: 

1. Onions – Because quercetin is a type of pigment found in food, red and yellow onions contain more of it than white onions. Onions are also a rich source of other essential nutrients, especially biotin. 

2. Cherry Tomatoes – Bright red and packed with pigment, cherry tomatoes have a high ratio of skin to flesh compared to other tomatoes which makes them a particularly strong source of quercetin. They’re also low in calories. 

3. Blueberries – Known for their antioxidant content anyway, blueberries are a great source of quercetin. On top of quercetin, these little berries contain over a dozen different phytochemicals including resveratrol, the antioxidant commonly found in red wine.

4. Apples – These fruits are full of phytochemicals including quercetin. They’re also rich in a beneficial dietary fiber called pectin which boosts digestion. Just be sure to enjoy apples with the skin to gain the most benefit. 

5. Broccoli – Not only is broccoli rich in quercetin, but it’s full of digestion-boosting fiber. It also contains plenty of vitamin K and vitamin C as well as another flavonoid antioxidant called kaempferol. 

If you’re having trouble meeting your daily needs for quercetin through a healthy diet, there’s another option: supplements. 

The term dietary supplements apply to a wide range of products including vitamins, minerals, enzymes, and other products that are designed to help boost and balanced nutrition. They typically come in pill, capsule, or liquid form and many can be purchased over the counter at your local drug store or pharmacy. Certain supplements may also be available in prescription-strength form through your physician’s office. 

Quercetin supplements are easy to find and simple to take. They come in a variety of dosages, typically in pill or capsule form, so you can easily customize your daily dose to meet your individual needs. 

Because there are so many different options out there for supplements, it’s easy to be overwhelmed by the choices. Before you start shopping, it’s wise to think about what you should be looking for in a quercetin supplement. Keep reading to learn what metrics we used to choose the top five quercetin supplements reviewed above. 

How We Ranked The Best Quercetin Supplements

When it comes to ranking quercetin supplements, it’s important to consider not only the amount of quercetin but its bioavailability. This largely depends on the food from which the quercetin is derived^[11]. In food, quercetin is found in the form of quercetin glycoside. Quercetin from onions is largely quercetin glucoside but apples contain quercetin rhamnoside and quercetin galactoside. 

In dietary supplements, quercetin typically takes the form of quercetin dihydrate. This form has poor bioavailability but the addition of digestive enzymes like bromelain or vitamin C from citrus fruits can enhance absorption. Dietary fat and the presence of fiber also enhance bioavailability^[11].

Here are some other factors we considered when picking quercetin supplements: 

Supplement Form 

You can find quercetin supplements in pill or capsule form. If you have trouble taking pills, capsules may be a little bit easier to swallow and digest. 

Serving Size

Follow your doctor’s advice regarding daily quercetin dosage, but pay attention to how much quercetin is in each pill. Some supplements have 250 mg per pill or capsule while others require more than one. The serving size impacts the overall cost of the supplement – higher serving sizes will require more pills per day so the bottle won’t last as long.

Inactive Ingredients 

Most supplements contain inactive ingredients like water along with the cellulose needed to create the capsules themselves. Avoid products that contain artificial additives and be mindful of allergen warnings if you’re sensitive to certain ingredients. 

Safety

When purchasing dietary supplements, it’s important to buy from a reputable company. Look for a brand that sources high-quality ingredients and follows the Food and Drug Administration (FDA) protocols for manufacturing. Companies that offer third-party testing results on their website should be trusted over companies that don’t provide any testing data at all. 

Money-Back Guarantee

It’s always a risk to purchase something without trying it and this is the case with any dietary supplement. When shopping for quercetin supplements, consider purchasing from a company that offers a money-back guarantee. That way if you don’t end up liking the supplement you can return it for a refund and try something else. 

How Much Quercetin Should I Take?

Your doctor is the best person to consult regarding dosing recommendations for quercetin supplements. The recommended dosage may depend on how much natural quercetin you get from your diet and what benefits you’re hoping to gain. If you’re taking quercetin for heart health, for example, you may need a higher dose than for general nutritional support. 

Quercetin studies suggest it is safe to take up to 1,000 mg^[7] of quercetin per day for up to 12 weeks. If you’re taking quercetin with other supplements, talk to your doctor about proper dosage and potential drug interactions. 

Potential Side Effects

When taken as recommended, quercetin supplements are generally well tolerated. Mild adverse effects like tingling in the extremities, upset stomach, and headaches have been reported. High doses of quercetin in excess of 1 gram (1,000 mg) per day may cause kidney damage.

If you’re pregnant, nursing, or have kidney disease it may not be safe to take quercetin supplements. These supplements may also impact the efficacy of antibiotics and blood thinners and have a high potential for drug interactions.

Final Thought

Quercetin has numerous health benefits to offer and it’s easy to take in supplement form. Quercetin supplement benefits range from supporting cardiovascular health and a healthy immune system to fighting free radicals and reducing inflammation. It may even have anti-aging effects on your cells to keep your brain strong and healthy into old age. 

While quercetin supplements can help with certain conditions, they’re best taken with a balanced diet. Talk to your doctor before taking any supplements, especially if you’re already taking medication or other supplements.

Frequently Asked Questions

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