What is Quercetin?

Quercetin 98% is best known for its anti-inflammatory and antioxidant properties. It is often found in herbal and nutritional formulas used to treat allergies and inflammation. It is one of the common flavonoids in human diet. The intake of quercetin is negatively correlated with the incidence of some chronic diseases such as coronary heart disease and tumor. A large number of experimental research results at home and abroad show that in addition to the significant antioxidant effect of quercetin in vitro, it also has the effects of inhibiting tumor cell growth, reducing inflammation, inhibiting vascular proliferation, regulating immune function, and anti-aging.

Certificate of Analysis

Item	Specification	Result	Method
Assay	Quercetin Dihydrate 98%	98.06%	UV
Physical & Chemical Data
Appearance	Yellow Green Fine Powder		Conforms	Organoleptic
Odor & Taste	Characteristic		Conforms	Organoleptic
Analytical Quality
Identification			Identical	Organoleptic
Sieve	NLT 95% Through 80 mesh		Conforms	Mesh Screen
Extract Solvent	Ethanol & Water		Conforms
Loss on Drying	≤ 12.0%		7. 15%	CP2020
Ash	≤0.2%		0.09%	CP2020
Bulk Density	0.30~0.70g/ml		Conforms	CP2020
Pesticide Residue
BHC	≤0.2ppm		Conforms	GC-MASS
DDT	≤0.2ppm		Conforms	GC-MASS
PCNB	≤0. 1ppm		Conforms	GC-MASS
Total Heavy Metals	≤ 10ppm		Conforms	Colorimetry
Arsenic(As)	≤2ppm		Conforms	AAS
Lead(Pb)	≤2ppm		Conforms	AAS
Mercury(Hg)	≤0. 1ppm		Conforms	AAS
Cadmium(Cd)	≤ 1ppm		Conforms	AAS
Microbiological Tests	Irradiation	Non irradiated
Total Plate Count	≤ 1000cfu/g	Conforms	CP2020	CP2020
Yeast & Mold	≤ 100cfu/g	Conforms	CP2020	CP2020
E.Coli	Negative	Negative	CP2020	CP2020
Salmonella	Negative	Negative	CP2020	CP2020
Staphylococcus	Negative	Negative	CP2020	CP2020
Conclusion	Conform with specification

Quercetin Function

Key Function for Cosmetics

1. Quercetin blocks "mast cells," key immune cells that trigger allergic reactions, inflammatory and autoimmune diseases, and help protect the skin from conditions such as dermatitis and photosensitivity.

2. Flavonoids like quercetin block the release of many pro-inflammatory cytokines, such as IL-8 and TNF, which help stop symptoms associated with skin inflammation

Quercetin Supplement Function

1. Anti-radical effect, quercetin inhibits the oxidase activity of cell membrane lipids to inhibit the process of cell membrane lipid peroxidation and protect cells from peroxidation damage; quercetin is a superoxide anion free radical scavenger, complexing Iron ions prevent free radicals from being produced in the body.

2. Antioxidative effect, Quercetin 98% contains more phenolic hydroxyl groups, which are easily oxidized to provide proton H+, and have the generality of phenolic antioxidants.

3. Anti-inflammatory and anti-allergic effects, by inhibiting cellular lipoxygenase and cyclooxygenase, the synthesis of pro-inflammatory factors is inhibited.

What is our Advantage？

1. Currently we have two factories. A GMP implementation standard factory with a 100,000-level purification workshop, and a fine processing workshop covering an area of 400 square meters.

2. Now we have Halal/kosher/SC/ISO9001/ISO22000 certificate

3. The professional team will provide you with perfect after-sales service.

4. Professional laboratories provide you with various tests.

5. Customize production for customers according to customers' quality and price of products.

why choose us

How To Contact Us?

Sales Market:	Email: sales@dnbiology.com
President's Office	Email: info@dnbiology.com

Where to Buy Quercetin?

As one of the most professional Quercetin 98% manufacturers and suppliers in China, Qyherb is featured by good service and competitive prices. If you're going to wholesale bulk high quality Quercetin in stock, welcome to get a free sample from our factory.

Why choose us?

We value customer feedback and use it to continuously improve our products and services.
Our company's strong strength, advanced equipment, strict quality management system and high-quality and perfect after-sales service are the guarantee of product quality and reputation.
Our products are manufactured with precision and care to ensure top-quality standards.
We insist on conscientious performance in production, operation and service activities, establish sincerity and trustworthiness, practice what we promise, be true to our words, and establish a good corporate image.
Our team is always looking for ways to improve our products and services.
Our excellent technology, stable products and sincere service have been recognized by our business partners all over the world.
As a supplier and manufacturer, we prioritize quality and affordability.
We actively play the comprehensive advantages of brand, capital and technology, and give full play to the dynamic role of international exchange and cooperation of the enterprise.
We provide comprehensive product information and documentation to our customers.
Our company adopts contemporary world-class Quercetin 98% production machinery and equipment and the latest technology, as well as a new intelligent standard factory to produce excellent and reliable products.

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