If you enjoy a crisp apple or a glass of red wine, you are already consuming quercetin. Quercetin is a natural compound found in many fruits and vegetables. It belongs to a group of plant substances called flavonoids. These compounds give plants their vibrant colors. Scientists call it a "master multitasker" because it supports the body in so many ways.
In this post, we will explore the science behind quercetin. We will look at its uses, benefits, and how it works.
What is Quercetin?
Quercetin is one of the most abundant antioxidants in the human diet. It is a flavonol, which is a sub-category of flavonoids. You can find it in red wine, green tea, apples, and berries. Buckwheat tea also contains exceptionally high amounts of this nutrient.
Nature uses quercetin to help plants survive. It protects them from environmental stress and radiation. When we consume these plants, we inherit those protective properties.
Quercetin acts as a powerful antioxidant. This means it helps neutralize free radicals, which are unstable molecules that can damage cells. They come from pollution, cigarette smoke, and even normal metabolism. Quercetin steps in as a shield to help keep our cells healthy and strong.
Because of its wide distribution and biological activity, quercetin has become a key ingredient in dietary supplements and functional foods formulations.
How Quercetin Works as An Antioxidant?
To understand quercetin, we first need to understand oxidative stress. Oxidative stress occurs when there are too many free radicals and not enough antioxidants in our bodies. This imbalance can lead to premature aging and various health problems.
Quercetin is considered a free radical scavenger. It travels through your body and neutralizes these harmful molecules. Scientific studies show it is more powerful than Vitamin C or Vitamin E in this regard. By reducing oxidative stress, it helps your organs function better. It also supports your skin's health, giving you a more youthful appearance.
What is Quercetin Used for?
Quercetin is not a single-purpose ingredient. Its wide range of biological effects makes it useful in multiple areas.
1. Supporting Immune Health
One of the most common uses of quercetin is immune support. Quercetin interacts with immune cells and helps regulate inflammatory signals. It also supports the body's natural defense system by reducing oxidative stress.
Many supplement formulations combine quercetin with other nutrients to enhance immune function.
2. Managing Inflammation
Inflammation is a natural response, but chronic inflammation can affect overall health. Quercetin helps regulate inflammatory pathways by inhibiting key enzymes. This makes it a popular ingredient in products designed to support joint health and general wellness.
Studies show that quercetin can reduce markers linked to inflammation in the body.
3. Cardiovascular Support
Heart health is another important area where quercetin is used. Research suggests that quercetin may help improve blood vessel function and support healthy circulation. It may also assist in maintaining normal blood pressure levels.
In addition, its antioxidant properties help protect blood vessels from oxidative damage.
4. Brain and Cognitive Support
Quercetin may also play a role in supporting brain health. Its antioxidant and anti-inflammatory properties help protect brain cells from damage. Early research suggests it may support cognitive function and overall neurological health.
Is Quercetin Used for Allergies?
Yes, quercetin can be used for allergies. One of the most popular uses for quercetin is allergy relief. Have you ever suffered from itchy eyes or a runny nose? This is usually caused by the release of histamine. Your body releases histamine when it thinks it is under attack by pollen or dust.
Quercetin acts as a natural antihistamine. Studies indicate that taking quercetin consistently can significantly improve comfort for allergy sufferers. It is particularly effective for those dealing with seasonal issues like allergic rhinitis.
Quercetin Used for Dogs
In our pets, quercetin is most often used to help with the itchiness, inflammation, and discomfort caused by allergies. It is commonly referred to as "nature's Benadryl" due to its natural anti-inflammatory, antioxidant, and antihistamine properties. Histamine is released from inflammatory cells when our dogs are exposed to allergens and it's part of the cause of itchy, puffy eyes and irritated, itchy skin.
What is Quercetin With Zinc?
Zinc is vital for immune system function. Zinc controls immune system messaging within the cells and is also an anti-oxidant (prevents cell damage) and is anti-inflammatory. In cellular lab cultures, zinc has been shown to stop viral reproducing in minutes. For zinc to work effectively in the body to boost immune system function, zinc has to be pushed into the cells which would require an ionophore.
An ionophore is a substance that transports particles across the cell wall barrier into the center of the cell. The center of the cell is where zinc needs to be to have the immune system effect. Viruses reproduce in the center of the cells. Zinc needs to be in the center of the cell to stop viral reproduction. An all-natural zinc ionophore is quercetin. The major benefit of taking quercetin with zinc is that the quercetin will push the zinc into the center of the cell where the zinc can stop the virus from reproducing.
Quercetin and Vitamin C
Another famous duo is quercetin and Vitamin C. These two antioxidants work in a beautiful cycle. When quercetin neutralizes a free radical, it becomes "oxidized." Vitamin C can then "recycle" that quercetin back into its active form.
Numerous experimental studies have proved that quercetin and vitamin C provide anti-inflammatory and antioxidant properties. The aim of this study is to assess the effects of both quercetin and vitamin C on lipid profile and muscle damage in human subjects.
Quercetin and vitamin C supplementation may not be beneficial in lipid profile improvement, although it may reduce induce muscle damage and body fat percent.
Foods with Quercetin
Quercetin is one of the most common flavonoids, and is present in many foods. It also appears in red wine, black tea, and green tea. When you get your quercetin from fruits and vegetables, you reap the other benefits of those foods. You also increase your intake of fiber, which is lacking in the standard American diet.
There's no recommended daily allowance for quercetin, but these commonly eaten foods are good sources of it:
1. Onions
All onions contain quercetin, but since it's a pigment, red and yellow onions contain the most. To keep the quercetin, peel off as little as possible of the outer layers. Onions contain many other vitamins and minerals, and they are especially rich in the vitamin biotin.
2. Kale
Kale has a well-deserved reputation as a nutritional powerhouse. Besides quercetin, it's also a rich source of vitamin A, vitamin C, and fiber. Half a cup contains only 18 calories.
3. Cherry tomatoes
All tomatoes are good sources of quercetin. Cherry tomatoes are the best because they have the highest ratio of skin to flesh. They make a great low-calorie snack, with only 37 calories per dozen.
4. Broccoli
Along with quercetin, broccoli is rich in vitamin K and vitamin C. It also contains another flavonoid, kaempferol, that offers potent antioxidant capabilities. A one-cup serving provides 5 grams of fiber.
5. Blueberries
Blueberries are antioxidant superstars. On top of quercetin, they contain 17 different phytochemicals including resveratrol, the antioxidant best known for appearing in red wine.
6. Apples
Apples contain four different phytochemicals along with the beneficial fiber known as pectin. To get the benefits of quercetin, eat your apples unpeeled. Apple juice doesn't provide the same benefits as the whole fruit.
Choose Undersun for Bulk Quercetin Powder
For bulk quercetin powder, please contact us at email: herbext@undersun.com.cn
When sourcing quercetin for supplements, functional foods, or pet nutrition products, quality and consistency are critical. This is where Undersun stands out as a reliable manufacturing partner.
The quercetin we supply is extracted from Sophora japonica flowers. It is a yellow-green powder with a purity of ≥95%, and is tested by HPLC. We can provide complete documentation, including: COA, specification sheets, SDS, production flow charts.
Undersun supports bulk orders and offers flexible supply solutions tailored to different business needs. Whether you are a supplement brand, contract manufacturer, or distributor, the company can provide scalable supply with stable lead times.
References
https://www.webmd.com/vitamins/ai/ingredientmono-294/quercetin
https://www.greatpetcare.com/wellness/quercetin-for-dogs-uses-and-benefits/
https://www.healthfirstdc.com/blog/the-importance-of-zinc-and-quercetin-during-pandemic
https://vitagene.com/blog/quercetin-for-allergies/
https://pubmed.ncbi.nlm.nih.gov/11272677/
https://www.webmd.com/diet/foods-high-in-quercetin
https://www.medicalnewstoday.com/articles/324170#8-benefits
https://www.medpagetoday.com/infectiousdisease/covid19/87373
