Dihydroquercetin is found in the dried bark of Pseudotsuga menziesii (Mirb.) Franco and can also be extracted from plants such as citrus, grapes, larch, and milk thistle.
Dihydroquercetin (DHQ), also known as Taxifolin, is a natural plant flavonoid with diverse biological activities. It is commonly used as an antioxidant in dietary supplements, cosmetics, functional foods, and pharmaceutical development.

Taxifolin

Item	Specifications	Test methods
Color	Off-white or light yellow
Odor and Taste	Unique odor and taste
Form	Powder
Impurities	No visible impurities
Reconstitution	A homogeneous solution, slight precipitation is permitted
Moisture	≤7 g/100g	GB 5009.3
Lead (as Pb)	≤0.5 mg/kg	GB 5009.12
Total arsenic (as 3S)	0.3 mg/kg	GB 5009.11
Cadmium (3d)	≤0.5 mg/kg	GB 5009.15
Total mercury (Hg)	≤0.1 mg/kg	GB 5009.17
Dihydroquercetin Content	≥90.0 %	/
Ethanol	≤0.5%	Pharmacopoeia General Chapter 0861
N-Hexane	≤25 ppm	GB 5009.262
Total Bacterial Count	≤ 1000 CFU/g	GB 4789.2
Coliform Bacteria	≤3 MPN/g	GB 4789.3
Molds and Yeasts	≤100 CFU/g	GB 4789.15
Salmonella	Not detectable	GB 4789.4
Staphylococcus Aureus	Not detectable	GB 4789.10

Taxifolin

1. Dihydroquercetin exhibits multiple biological activities common to flavonoids, including antioxidant, free radical scavenging, and antimicrobial properties. Dihydroquercetin, a reduced form of quercetin, can be used as a novel food ingredient in functional foods.
2. It helps relieve stress and fatigue, and enhances cognitive function.
3. Dihydroquercetin inhibits lipid peroxidation and can reduce liver lipid and cholesterol levels.
4. It enhances immunity. Dihydroquercetin may help fight infection and strengthen the body's immune response.

Taxifolin