Quercetin

Safety profile

5 studies reporting safety data2 increased-risk findings

Quercetin has been associated with increased anxiety and sleep disturbances in one small study (4/6 vs 0/6 in a combination therapy group). Across 5 clinical studies, no serious adverse events were reported. Two studies found no significant differences in adverse effects compared to placebo, and three additional studies described quercetin as generally well tolerated with no or minimal adverse events. However, the evidence base is limited by small sample sizes and short study durations.

Caveats: The increased risk finding comes from a single study with only 6 participants per group receiving quercetin in combination with another agent; generalizability is limited. Most studies were not powered to detect rare adverse events, and long-term safety data are lacking.

Most-studied combinations with Quercetin

most supplement research is combination research

Also studied with:L-Citrulline (2), Turmeric (2), Vitamin D (2), Vitamin E (2), Vitamin C (2), green tea (2)

Defense Lung Formula with Quercetin & Green Tea Extract

By Catalo Naturals

4.6 (106 reviews)

In Stock

Pricing Information
Ingredient	Quercetin
Amount per Pill	210 mg
Total Amount	37.8 g
Price per mg	USD 0.001

Supplement Ingredients
Ingredients	Amount Per Serving
Calories	-
Total Carbohydrate	2 g
sodium Sodium	15 mg
quercetin extract Quercetin	630 mg
standardized 98.5% quercetin anhydrous	-
green tea extract Green Tea	630 mg
standardized 98% polyphenols	-
50% EGCG	-

GMP Certified

Product Description

Promotes respiratory health and supports lung function.
Quercetin Extract: Helps reduce inflammation and supports immune response.
Green Tea Extract: Rich in antioxidants to combat free radicals and enhance overall lung function.
Vegetarian Capsules: Ideal for those following a plant-based diet.
Free from gluten, artificial flavors, and preservatives, making it suitable for sensitive individuals.
GMP Certified: Ensures high quality and safety standards.
Easy to incorporate into daily routine for ongoing respiratory support.

Other ingredients

plant capsule (water soluble plant polysaccharides)
plant cellulose
magnesium stearate
silicon dioxide

Free of

gluten
artificial flavors
artificial colors
preservatives

Serving Size: 3

Servings per Container: 20

Pill Type: Vegetable Capsule

Flavor: -

UPC: 810399028666

Liposomal NAD+ ULTRA

By Codeage

4.8 (80 reviews)

In Stock

Pricing Information
Ingredient	Quercetin
Amount per Pill	100 mg
Total Amount	27 g
Price per mg	USD 0.003

Supplement Ingredients
Ingredients	Amount Per Serving
riboflavin Vitamin B2	1 mg
riboflavin 5-phosphate Vitamin B2	-
vitamin B12 Vitamin B12	250 mcg
methylcobalamin Vitamin B12	-
NAD+	500 mg
Nicotinamide Adenine Dinucleotide	-
quercetin extract Quercetin	300 mg
from Sophora japonica Sophora	-
flower	-
trans-resveratrol	180 mg
Japanese knotweed root extract Japanese Knotweed	-
standardized to 98% trans-resveratrol	-
Reynoutria japonica	-
Betaine Anhydrous	102.5 mg
Trimethylglycine	-

Product Description

Promotes cellular energy production with 500 mg of NAD+ to support vitality and longevity.
Enhances antioxidant support with 180 mg of trans-resveratrol, helping to protect against free radicals.
Boosts your immune system and cardiovascular health with quercetin extract at 300 mg.
Improves metabolic processes and liver function with 102.5 mg of Betaine Anhydrous.
Supports brain health and cognitive function with Vitamin B12 at 250 mcg.
Aids in maintaining healthy skin and mucous membranes through 1 mg of riboflavin.
Liposomal Formulation: Provides enhanced absorption and bioavailability for optimal benefits.
100% Gluten Free, Soy Free, Dairy Free, and Vegan, catering to diverse dietary needs.
Technologically advanced delivery for superior nutrient transport and maximum absorption.

Other ingredients

methylcellulose capsule
microcrystalline cellulose
non-gmo sunflower oil (containing phosphatidylcholine; liposomal delivery matrix)

Free of

Serving Size: 3

Servings per Container: 30

Pill Type: Capsule

Flavor: -

UPC: 850049609036

Allergy Health

By Emerald Laboratories

4.4 (115 reviews)

In Stock

Pricing Information
Ingredient	Quercetin
Amount per Pill	83.33 mg
Total Amount	22.5 g
Price per mg	USD 0.002

Supplement Ingredients
Ingredients	Amount Per Serving
Vitamin C as PureWay-C™ Vitamin C	500 mg
Project Verified Non-GMO Ascorbic Acid Vitamin C	-
Citrus Bioflavonoids	-
Vegetable Fatty Acids	-
nettle leaf powder Stinging Nettle	300 mg
Quercefit® Quercetin Phytosome Quercetin	250 mg
Sophora japonica L. extract Sophora Japonica	-
Sunflower lecithin Lecithin	-
N-Acetyl-L-Cysteine Vegan N-Acetyl Cysteine	250 mg
Bromelain	125 mg
eyebright herb powder Eyebright	100 mg
Raw Whole-Food Proprietary Blend	100 mg
Organic Raw Whole Food Sprout Powders	-
Raw Probiotic Blend	200 million CFU
Raw Plant Enzyme Blend	-
Fructo-Oligasaccharides	-
Whole Food Pomegranate Juice Powder	-
Organic Raw Whole Food Freeze-Dried Acai Powder	-
Whole Food Mangosteen Hull Powder Mangosteen	-
Organic Whole Food Noni Fruit Powder	-

Outcomes Supported by Research

Reduced Virulence / Lower Risk of Fungemia1 studies
Increased Antibacterial Activity Against Pathogens1 studies
Reduced Listeria Monocytogenes Population1 studies
Immune Response to Rotavirus Vaccine Antigen1 studies
Reduced Anti-Listeria Effect1 studies

Product Description

Supports Sinus and Immune Health: Packed with PureWay-C™, a fast-absorbing vitamin C, to bolster your immune system.
Eases Seasonal Discomfort: The Quercefit® Quercetin Phytosome aids in reducing oxidative stress and inflammation, common triggers of allergy symptoms.
Promotes Respiratory Wellness: N-Acetyl-L-Cysteine Vegan helps thin mucus and supports lung health, promoting better breathing.
Digestive Harmony: Our Raw Probiotic Blend with 200 million CFU enhances gut health, which is crucial for a balanced immune response.
Natural Anti-Inflammation: Bromelain, derived from pineapples, supports the body's ability to manage inflammation and pain, often associated with allergies.
Vision Support: The traditional eyebright herb powder works synergistically to soothe symptoms related to eye irritation.
Organic and Vegan: Ensuring you receive the purest, plant-based ingredients without the worry of gluten, artificial additives, or animal products.
Enhanced Absorption: Our proprietary blends and advanced formulations, including Quercefit® Quercetin Phytosome, ensure maximum nutrient uptake for optimal results.

Other ingredients

vegetable capsule

Free of

milk
salt
yeast
soy
wheat
artificial flavors

Serving Size: 3

Servings per Container: 30

Pill Type: Vegetable Capsule

Flavor: -

UPC: 743650002283

Quercetin Phytosome
By Emerald Laboratories
4.8 (113 reviews)
In Stock
Pricing Information
Ingredient Quercetin
Amount per Pill 250 mg
Total Amount 15 g
Price per mg USD 0.002
Supplement Ingredients
Ingredients Amount Per Serving
Quercefit® Quercetin Phytosome
Quercetin
250 mg
Sophora japonica L. extract
Sophora Japonica
-
sunflower lecithin
Lecithin
-
Outcomes Supported by Research
Reduced Virulence / Lower Risk of Fungemia1 studies
Increased Antibacterial Activity Against Pathogens1 studies
Reduced Listeria Monocytogenes Population1 studies
Immune Response to Rotavirus Vaccine Antigen1 studies
Reduced Anti-Listeria Effect1 studies
Gluten Free
Vegan
Product Description
Supports immune health with 250 mg of Quercefit® Quercetin Phytosome, a highly bioavailable form of quercetin.
Enhances antioxidant support to help combat oxidative stress and maintain overall well-being.
Promotes cardiovascular health by assisting in the regulation of healthy blood pressure and circulation.
Easy to digest with a vegetarian capsule that's gluten-free and vegan, ensuring it fits almost any dietary preference.
Advanced formulation using Quercefit® technology for better absorption and efficacy compared to standard quercetin supplements.
Natural and clean ingredients, making it a perfect choice for those seeking pure and effective supplementation.
Other ingredients
vegetable capsule
Free of
corn
milk
salt
yeast
soy
egg
fish
added sugar
wheat
artificial flavors
preservatives
Serving Size: 1
Servings per Container: 60
Pill Type: Vegetable Capsule
Flavor: -
UPC: 743650003655
Available From
Available From
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$34.16
In
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$34.16
In
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$34.16
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$-
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Aller-Pure

By Irwin Naturals

4.6 (9 reviews)

In Stock

Pricing Information
Ingredient	Quercetin
Amount per Pill	83.33 mg
Total Amount	13.5 g
Price per mg	USD 0.002

Supplement Ingredients
Ingredients	Amount Per Serving
Calories	-
Total Fat	1.5 g
Cholesterol Cholesterol	20 mg
Total Carbohydrates	2 g
Protein	1 g
Vitamin C Vitamin C	200 mg
Ascorbic Acid Vitamin C	-
Vitamin D3 Vitamin D	37.5 mcg
cholecalciferol Vitamin D	-
Vitamin B6 Vitamin B6	2 mg
Pyridoxine Hydrochloride Vitamin B6	-
Zinc Zinc	11 mg
Zinc Citrate Zinc	-
fish oil Omega-3 Fatty Acids	1.35 g
eicosapentaenoic acid (EPA) Eicosapentaenoic Acid (EPA)	243 mg
docosahexaenoic acid (DHA) Docosahexaenoic Acid (DHA)	162 mg
stinging nettle extract Stinging Nettle	300 mg
leaf	-
4:1	-
quercetin extract Quercetin	250 mg
Dimorphandra mollis (pod)	-
Dimorphandra mollis (seed) Dimorphandra	-
rutin	200 mg
bromelain	120 GDU
butterbur extract Butterbur	100 mg
Petasites hybridus (root) Butterbur	-
10:1 extract	-
Luteolin	50 mg
BioPerine Complex	6 mg
BioPerine® Black Pepper extract	-
Ginger extract Ginger	-

Preservative Free

Product Description

Supports respiratory health and alleviates allergy symptoms for a more comfortable life.
Vitamin C boosts immunity and fights off free radicals.
Vitamin D3 augments immune function and supports overall health.
Vitamin B6 aids in neurotransmitter function and reduces inflammation.
Zinc promotes immune response and skin health.
Rich in EPA and DHA from fish oil for cardiovascular benefit and cognitive support.
Stinging Nettle Extract helps reduce inflammation and respiratory issues.
Quercetin Extract combats oxidative stress and reduces allergy-related discomfort.
Rutin strengthens blood vessels and enhances cardiovascular health.
Bromelain supports sinuses and reduces inflammation.
Butterbur Extract alleviates seasonal allergy symptoms.
Luteolin offers potent antioxidant properties to support overall health.
BioPerine Complex enhances the absorption and efficacy of key nutrients.
Free from preservatives, ensuring a more natural intake.

Irwin Naturals' Aller-Pure utilizes a proprietary BioPerine Complex to enhance nutrient absorption, ensuring that your body fully benefits from each carefully selected ingredient. Thoughtfully crafted in a preservative-free softgel, Aller-Pure integrates cutting-edge nutrition science for optimal respiratory and immune support. Simplify your wellness routine and embrace better health with Aller-Pure.

Other ingredients

gelatin
purified water
glycerin
beeswax
sunflower lecithin
maltodextrin
annatto (color)
titanium dioxide (color)
dextrin
St. John's bread (carob) (color)
turmeric (color)

Free of

Serving Size: 3

Servings per Container: 18

Pill Type: Softgel

Flavor: -

UPC: 840081407240

Quercetin Blend

By Nature's Answer

4.8 (25 reviews)

Out of Stock

Supplement Ingredients
Ingredients	Amount Per Serving
zinc Zinc	25 mg
zinc picolinate Zinc	-
Copper Copper	1 mg
Copper gluconate Copper	-
Quercetin Phytosome	250 mg
Sophora japonica extract (flower) Sophora Japonica	-
Phospholipid complex from sunflower Phospholipids	-
standardized to quercetin Quercetin	75 mg
Quercefit®	-
bromelain	150 mg
from pineapple fruit	-
standardized to 360 GDU	-

Product Description

Supports Immune Health: Quercetin, standardized to 75 mg, is known for its antioxidant properties that help bolster your immune system.
Promotes Respiratory Comfort: Bromelain 150 mg aids in reducing inflammation and supporting respiratory health.
Boosts Immune Function: Zinc 25 mg is essential for immune function, helping to keep your body's defenses strong.
Supports Healthy Skin and Hair: Copper 1 mg contributes to the maintenance of healthy skin and hair.
Enhanced Absorption: Quercetin Phytosome 250 mg is formulated for better absorption, ensuring you get the most out of each dose.
Suitable for All Diets: The product is gluten-free and vegan, making it suitable for a wide range of dietary needs.

Each vegetarian capsule of Nature's Answer Quercetin Blend is crafted to deliver a comprehensive approach to maintaining your health, from immune support to respiratory comfort. This thoughtfully formulated blend ensures enhanced absorption and effectiveness, giving your body a natural boost without any gluten or animal products.

Other ingredients

vegetable cellulose (capsule)
maltodextrin
silicon dioxide
calcium silicate

Free of

Serving Size: 1

Servings per Container: 60

Pill Type: Vegetable Capsule

Flavor: -

UPC: 083000165313

Merchant	Price	Stock
Amazon	$-	Out
iHerb	$89.99	In
Vitacost	$89.99	In
Vitamin Shoppe	$89.99	In

Merchant	Price	Stock
Amazon	$34.16	In
iHerb	$34.16	In
Vitacost	$34.16	In
Vitamin Shoppe	$-	Out

Quercetin

Safety profile

Defense Lung Formula with Quercetin & Green Tea Extract

Liposomal NAD+ ULTRA

Allergy Health

Quercetin Phytosome

Aller-Pure

Quercetin Blend