Quercetin CAS No.6151-25-3

Product name


Quercetin Herbal Source

Sophora Japonica L.



Quercetin Chemical Formula


Quercetin Molecular Weight

Quercetin Specifications

Test Method



Light yellow needle crystal

Quercetin Solubility in Water

Very slightly soluble in diethyl ether, not soluble in cold water, difficultly soluble in hot water. The solution is yellow when soluble in acetic acid and alkaline solution.

Quercetin is a kind of natural flavonoid compound. Quercetin flavonoid widely exists in the sophora japonica of leguminous plants. Natural quercetin mainly comes from the enzymolysis of rutin in yellow needle crystal, widely used in food, pharmaceutical and nutraceutical industries.

For different diseases, quercetin has various functions: quercetin for allergies, quercetin anti inflammatory, quercetin antihistamine, quercetin antioxidant, quercetin for immune support, quercetin for seasonal allergies and etc.

As a plant extract company, we provide quercetin bulk, quercetin bulk supplementsand high quality quercetinfor sale. And our quercetin price is competitive in the Chinese quercetin market. If you want to buy quercetin powder, please contact us!

The Benefits of Quercetin Extract Powder for Health

What is Quercetin? Definition: Quercetin is a kind of sophora japonica flower extracts widely existing in plants, with antioxidant, anti-tumor, anti aging, antiviral, anti-arteriosclerosis (AS), hypoglycemic, hypidemia and many other pharmacological effects. Quercetin has a certain anti-inflammatory activity, mainly manifested as the inhibition of inflammatory factors. Besides, it also has an inhibitory effect on the central nervous system. Kindarco, a reputable Quercetin company, has quality Quercetin powder for sale and for customers to buy, all with cheap prices and relevant pdf files.

What is Quercetin Good for in the Cosmetics?

Quercetin can be used as a cosmetic additive in skin care products like skin cream, foundation and makeup products. In cosmetics, the main role of Quercetin is to remove free radicals, and to have an antioxidant effect, relatively safe to use, without causing acne. Quercetin is suitable for wrinkled skin, sensitive skin, pigmented skin, tolerant skin, firm skin, oily skin, dry skin, etc. Quercetin, sourced from sophora japonica flowers, can prevent the formation of melanin, reduce the number of melanin produced within the cell, and has a good whitening effect. Quercetin can remove hydroxyl radicals, superoxide radicals, and has a strong antioxidant capacity to slow skin ageing. Pure quercetin has a certain inhibitory effect on E. coli and staphylococcus aureus and can be used as a natural anti-corrosion ingredient of cosmetics.

Benefits of Taking Quercetin for Cancer Treatment

In the aspect of anti-cancer and dosage treatment, whether it’s prostate cancer, breast cancer, or pancreatic cancer, Quercetin has been shown by many studies to have an inhibitory effect on various cancer cells, and help with life extension. In terms of the specific mechanism of action, Quercetin has a variety of biological effects, inhibiting a variety of enzymes in cancer cells to participate in cell proliferation and signal transduction. Low dose of Quercetin exerts a specific inhibitory effect on the proliferation of cancer cells, which is caused by G1 cell cycle arrest. Quercetin induces a P21 CDK inhibitor with decreased phosphorylation of pRb, which inhibits G1/S cell cycle progression by trapping E2F1.

Effects of Quercetin for Sleep

Quercetin can increase the amount of serotonin in the human brain and improve the permeability of serotonin in nerve cells, thus reducing anxiety, depression and stress, shortening the time to fall asleep, significantly reducing the number of waking times during sleep, improving sleep quality and helping deep sleep. Quercetin has a certain effect on the treatment of insomnia and sleep disorder, and does not produce adverse effects. It is often used for sleeping products and products that lower blood lipid and blood pressure.

Benefits of Using Quercetin for Allergy Relief

The potential anti-inflammatory properties of Quercetin antihistamine can ease allergy symptoms. Test-tube and animal studies have found that it blocks inflammation-related enzymes and inhibits inflammation-promoting chemicals such as histamine. One study, for example, showed that taking a supplement of Quercetin inhibited peanut-related allergic reactions in mice. As a flavonoid glycoside with anti-allergic activity, Quercetin can be used for the prevention or relief of various seasonal allergies such as atopic dermatitis, bronchial asthma, allergic rhinitis, vascular oedema, atopic diseases, allergic contact dermatitis, hay fever, urticaria, etc.

Benefits of Quercetin for Hair Growth

Have to admit, fluffy and soft bright hair, really makes your temperament up a few grades. In terms of the benefits of Quercetin for hair, it can deeply nourish the scalp, repair damaged hair and promote hair growth. As it has strong antioxidant properties, Quercetin power provided by Kindarco, a reliable Quercetin supplier, can prevent inflammation of damaged hair follicles, strengthen the scalp and ensure hair growth. Once the scalp is "raised" in a good condition, we can solve many other hair problems such as trichomadesis, poor hair quality, scalp pruritus, etc.

What is the Use of Bulk Quercetin Powder?

There are various uses of quercetin, such as being health products and cosmetics. Also, being plant extract as food preservative, it can be used in food.

Quercetin is widely used in our life. Quercetin has very good antioxidants. It is often used by a variety of nutritional products for immune support. Medical nutritional supplements containing Quercetin are beneficial for treating eye diseases such as allergies, diabetes, cataracts and retinal detachment. Besides, Quercetin can also effectively prevent atherosclerosis and fight ageing.

What is Quercetin Used for in the Nutraceutical Industry?

The application form of high quality Quercetin in food is relatively simple, mainly as a food additive or directly applied to food to increase its health function. In terms of its product form, liquid drinks, fruit and vegetable juice drinks (single or mixed), low-degree fermented wine, tea (solid or liquid) occupy a large proportion.

What is Quercetin Mechanism of Action?

Quercetin can significantly inhibit HSV2 activity and strongly inhibit the infection of influenza virus A/W3/33. In the initial stage of viral infection, Quercetin can inhibit viral replication through indirect reaction with viral factors, and its antiviral effect is stronger than Oseltamivir.

Due to its special chemical structure, Quercetin has the ability to scavenge many kinds of active oxygen free radicals and can inhibit the production of TBARS induced by oxidizing drugs.

Quercetin 95, CAS NO. 6151-25-3 can inhibit TPA-induced tumour transformation and down-regulate UVB or TPA-induced AP-1 and NF-KB transcriptional activation. In addition, Quercetin can also promote Nrf2 activation and increase GST activity.

Is Quercetin Safe?

Quercetin is found in many fruits and vegetables and is quite safe to eat. As a supplement, the amount of Quercetin and the weight of Quercetin molecular contained varies, and 500 to 1500 mg per day is generally considered the most beneficial. However, some health care experts maintain that the doses are too high and tend to cause adverse reactions or mild symptoms in some people, such as headaches and stomachaches. These experts agree that getting Quercetin from a normal daily diet is a healthier way than getting it by taking supplements.

What Foods Are High in Quercetin?

Quercetin is widely found in the stems, flowers, leaves, buds, seeds and fruits of many plants, mostly in the form of glycosides, such as rutin and hyperin, which can be obtained by acid hydrolysis. The content of Quercetin is higher in such food sources as the buckwheat rod and leaf, sea buckthorn, hawthorn, and onion. Quercetin is also found in many other natural sources like leeks, asparagus, cabbage, mustard greens, green peppers, chicory, grapefruit, lettuce, apples, mangoes, plums, radishes, blackcurrants, potatoes and spinach. In addition, there are about 100 kinds of medicinal plants (sophora rice, side cypress leaves, galangal, corundum flower, mulberry parasitic, panax notoginseng, ginkgo, elder, etc.) that contain this component. The following chart will help you learn more about the source of Quercetin and various foods containing Quercetin.

Technical Data Sheet (TDS) of Quercetin Extract Powder for Sale

Assay Item


Test Result

Assay( on dry Product)







Yellow powder



None to slight


Heavy metals


















Reducing sugar






Sulphated ashes



Particle size

100% Through 80 mesh





Mould and Yeast






Escherichia coli



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