Evidence supporting the use of: Quercetin
For the health condition: Arthritis

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Quercetin, a flavonoid found in many fruits and vegetables, has been investigated for its potential anti-inflammatory and antioxidant properties, which are relevant to arthritis. Scientific interest in quercetin's use for arthritis is primarily based on preclinical studies. In vitro (cell culture) and animal studies have shown that quercetin can inhibit the production of pro-inflammatory cytokines (such as TNF-α, IL-1β, and IL-6), decrease oxidative stress, and reduce cartilage degradation—mechanisms that are implicated in the pathogenesis of both osteoarthritis and rheumatoid arthritis.

However, human clinical evidence remains limited. A few small randomized controlled trials (RCTs) have reported modest benefits. For example, a 2017 RCT in women with rheumatoid arthritis found that quercetin supplementation (500 mg/day for 8 weeks) led to significant reductions in early morning stiffness, pain, and disease activity scores compared to placebo. Another small study in knee osteoarthritis patients suggested some improvement in symptoms with quercetin, but the results are not robust or consistent across all studies.

Overall, while the mechanistic rationale is strong and preliminary results are promising, the clinical evidence remains insufficient to recommend quercetin as a primary therapy for arthritis. Larger, high-quality trials are needed to confirm its efficacy and safety in this context. Thus, the use of quercetin for arthritis is currently supported more by emerging scientific evidence than by tradition, but its role should be considered adjunctive and investigational.

More about quercetin
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Other ingredients used for Arthritis

adrenal cortex
alfalfa
algal oil
allspice
aloe vera
alpha-linolenic acid (ALA)
alpha-pinene
amino acids
anthocyanins
ashwagandha
astaxanthin
bamboo
barberry
basil
berry flavor
beta caryophyllene
Beta-Glucan
black cumin
black currant
black garlic
black pepper
sesame
black tea
blackberry
blueberry
borage oil
boron
Indian frankincense
bovine
bovine gelatin
broccoli
bromelain
burdock
calamari oil
cannabis sativa oil
capsaicinoids
carrot
cartilage
cat's claw
caterpillar mushroom
celery
cherry
chondroitin
chymotrypsin
cinnamon
citrus oil
clove
collagen
collard
conjugated linoleic acid (CLA)
copper
cordyceps
cowage seed
cryptoxanthin
turmeric
curcumin
devil's claw
DHA (docosahexaeonic acid)
DPA (docosapentaenoic acid)
EPA (eicosapentaenoic acid)
epigallocatechin gallate (EGCG)
evening primrose oil
fish oil
fish protein
flavonols
flaxseed
gamma linolenic acid (GLA)
gamma tocopherol
gelatin
genistein
ginger
ginseng
glucosamine
gooseberry
gotu kola
green lipped mussel
green tea
guggul
heartwood
hemp oil
horsetail
hyaluronic acid
Indian tinospora
knotweed
kale
krill oil
kudzu
luteolin
mackerel
magnesium
marine lipid
methylsulfonylmethane (MSM)
microbial enzymes (proprietary)
microcrystalline hydroxyapatite concentrate (MCHC)
moringa
mustard seed
myristoleate
n-acetyl-glucosamine
n-acetyl-cysteine (NAC)
nettle
niacinamide (vitamin B3)
spruce
oleanolic acid
oleic acid
olive
omega-3 fatty acids
orange
oregon grape
papain
phellodendron amurense
phenolic acids
phospholipids
phytocannabinoids
pine bark
pineapple
plantain
pollen
pomegranate
pregnenolone
pumpkin
quercetin
raspberry
redcurrant
reishi mushroom
resveratrol
rhizome
rose hips
rosemary
sardines
schizonepeta
scrophularia root
serratiopeptidase
black ginger
specialized pro-resolving mediators (SPMs)
sphaeranthus indicus
spinach
spirulina
strawberry
strontium
thyme
triphala
ubiquinol
vitamin B
vitamin B6
vitamin C
vitamin D
vitamin D3
vitamin E
seaweed
water
watercress
wheat grass
mulberry
white willow
wild yam
zinc
sarsaparilla
yellow root
suma
squawvine
jiaogulan
typhonium
xanthium (cockleburs)
gastrodia
papaya
shen-chu
capsicum
mugwort
alpinia galangal
clerodendrum indicum
punarnava
commiphora
smilax
tinospora cordifolia
blackboard tree
caesalpinia crista
rubia cordifolia
bee pollen
peony
lingzhi
lingusticum wallichii
buckthorn
morus
lemongrass
myrrh
root tuber
ferulic acid
silk tree
chrysanthemum
haliotis
juniper berries
solomon's seal
amber
dioscorea
dodder
ganoderma
sweetgums
morinda
zanthoxylum
birch
royal jelly
guelder rose
polyphenols
trace minerals
purslane
fulvic acid
yucca
barrenwort
wintergreen
menthol oil
gentiana macrophylla
noni
biota seed
goji berry
abies spectabilis
herbal blend (proprietary)
algae
indigo leaves
AMP-activated protein kinase (AMPK)
enzymes blend (proprietary)
cayenne pepper
soursop
geranium
clematis
3-(4-hydroxy-3-methoxyphenyl)prop-2-enoic acid
Ash
Aralia
Avens
akebia
Apple Cider Vinegar
Aminomonosaccharide
Animal Tissue
Antler
Alpha-Humulene
Ardisia
Angelica
Apigenin
Allicin
Achyranthes
Anamu
Abrus
Albizia
Aconite
Ajuga
Aucubin
Andrographolide
Avocado
Anserina
Ascophyllum nodosum
American Liverleaf
Anemone
Acacetin
Alpha-Lipoic Acid
Astragaloside
anthocyanidins
Andrographis
Ampelopsin
Actaea spicata
Asteracea
Avenacosides
Acetylsalicylic acid
Arjunic Acid
Aspen
Ant
Abalone
Abuta
Allium tuberosum
Amor seco
Arani
Arisaema
Alantolactone
Apocynin
Astragalin
Atractylone
Bee Propolis
Betony
Black Seed
Bermuda Grass
Baikal Skullcap
Bidens pilosa
Broussonetia
Bulnesia sarmientoi
bergenin
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Blepharis
Balsam
Bishop's Weed
Boswellic Acid
Bayleaf
Butea monosperma
Black galingale
Barleria
Big Quaking Grass
Bugbane
Bone Marrow
Baicalein
Bee hive
Bovine Protein
Basidiomycota
berry
Bogbean
Boswellia
Black Poplar
Banyan
Black willow
Boxwood
Bur-Reed
Bioflavonoids
Barbasco
Bone Protein
Bee products
Barbary matrimony vine
Black Nightshade
Bombax
Borassus Palm
Borassus aethiopum
Babassu
Bacteria
Borage
bovine cartilage / glycosaminoglycan
Black root
Bupleurum
Bittersweet
benzyl isothiocyanate
Baicalin
Bassia scoparia
Burning Bush
Bee venom
Bergenia
Boerhavia diffusa
Borneol
Camellia sinensis
Centella triterpenes
Chinese Silkvine
Curry leaf
Caryophyllene
Cinnamomum
Chinese Mountain Ant
Crustaceans
Clerodendrum trichotomum
Camelina Oil
Cod Liver Oil
Cortisol
Cnidium
Clerodendrum phlomidis
Cactus
Capillary Artemisia
Cyanidin
Chinese Fleeceflower
Curcuminoid
Citrus
Capsaicin
Chinese Pond Turtle
Chinese Raisintree
Chlorophytum
Chuchuhuasi
Cowherb
Cruciferous
Curcumen
Centella asiatica
Cetylated Fatty Acids
Cedar
Corktree
Curcuma
Calanus finmarchicus
C-Phycocyanin
Cabbage
Crinum latifolium
Cannabidiol
Cinnamaldehyde
Cytokines
Corallina officinalis
Carthamus
Celastrus
Copaiba Oil
Clerodendrum indicum
Currant
Cannabichromene
Cannabigerol
Dimorphandra mollis
Docosahexaenoic Acid
Dodeca-2E, 4E-Dienoic Acid Isobutylamide
Daphne
Devil's Club
Dihomo-gamma-linolenic acid
Dwarf Nettle
Dulse
Diterpenes
Dimethyl sulfoxide (DMSO)
Dipsacus
European Elder
Erythropalum scandens
Eupolyphaga sinensis
Erodium cicutarium
Eclipta
Elk antler
Emblicanin
Emu Oil
Enzyme Blend
Eicosapentaenoic Acid
Essential Oil Blend
Elephant's Head
Evening Primrose Oil
European-Five Finger Grass
Echium
Eugenol
Ecklonia
Flavonoids
Flavonones
Glycosaminoglycans
Lotus
Mustard
Spikenard
Snakeroot (unspecified)
Sandalwood
Sumac
walnut
Zucchini

Products containing quercetin

Pure Encapsulations Acerola/Flavonoid
Thorne Advanced Nutrients Multivitamin
Pure Encapsulations AI Formula
Pure Encapsulations Aller-Essentials
Pure Encapsulations Aller-Essentials
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Pure Encapsulations Balanced Immune
Designs For Health BioFizz® Immune
Metagenics CardioLux® HDL
Designs For Health C+BioFizz®
Douglas Laboratories Cysto Renew ®
Pure Encapsulations Daily Immune
Integrative Therapeutics Detoxication Factors
Integrative Therapeutics Detoxication Factors
Designs For Health DFH Complete Multi™
Designs For Health DFH Complete Multi™ with Copper
Designs For Health DFH Complete Multi™ with Copper & Iron
Thorne Diabenil
Designs For Health DopaBoost™
Designs For Health Electrolyte Synergy™
Pure Encapsulations Essential-C & Flavonoids
Pure Encapsulations Essential-C & Flavonoids
Designs For Health GI Revive®
Designs For Health GI Revive®
Designs For Health H-S-N Radiance™
Pure Encapsulations Hist Reset
Designs For Health HistaEze™
Metagenics Immune Active
Metagenics Immune Defense Pack
Designs For Health Inflammatone™
Designs For Health Inflammatone™
Designs For Health Inflammatone™
Vitabase Life's Essentials Plus
Metagenics Multigenics®
Metagenics Multigenics Chewable Orange
Metagenics Multigenics Intensive Care
Metagenics Multigenics Intensive Care without Iron
Metagenics Multigenics without Iron
Pure Encapsulations NeuroMood Pure Pack
Pure Encapsulations NeuroPure
Designs For Health OcuForce™
Designs For Health PaleoCleanse Plus™
Designs For Health PaleoCleanse Plus™
Designs For Health PaleoCleanse Plus™ Detox Program
Designs For Health PaleoCleanse Plus™Chocolate Detox Kit
Designs For Health PhytoBiome™
Metagenics PhytoGanix® Tropical Fruit
Designs For Health Plant Protein Cleanse
Designs For Health Plant Protein Cleanse Plus™ 570g
Pure Encapsulations Polyphenol Nutrients
Pure Encapsulations Polyphenol Nutrients
Thorne PolyResveratrol-SR
Designs For Health Primal Multi™
Vitabase Prostate Complex (Formerly Prostate Complete)
Pure Encapsulations PureDefense
Pure Encapsulations PureDefense with NAC
Pure Encapsulations PureDefense with NAC
Pure Encapsulations PureLean® Protein
Pure Encapsulations Quercetin
Pure Encapsulations Quercetin
Metagenics Quercetin 500
Vitabase Quercetin Plus
Designs For Health Quercetin-Ascorbate
Douglas Laboratories Quercetin-Bromelain Complex
Thorne Quercetin Complex Quercenase
Designs For Health Quercetin + Nettles
Thorne Quercetin Phytosome
Pure Encapsulations Quercetin UltraSorb
Thorne ResveraCel
Designs For Health Resveratrol Supreme
Designs For Health Senolytic Synergy
Metagenics Sinuplex®
Designs For Health Stellar C™
Vitabase Super Antioxidant Formula
Pure Encapsulations Th2 Modulator
Designs For Health Ultimate Antiox Full Spectrum
Douglas Laboratories Ultra Preventive
Douglas Laboratories Ultra Preventive
Douglas Laboratories Ultra Preventive ®-EZ Swallow
Douglas Laboratories Ultra Preventive® X
Douglas Laboratories Ultra Protein Green
Metagenics UltraInflamX Plus 360°® Chocolate/Orange
Metagenics UltraInflamX Plus 360° Mango
Metagenics UltraInflamX Plus 360° Mango
Metagenics UltraInflamX Plus 360° Orange
Metagenics UltraInflamX Plus 360° Original Spice
Metagenics UltraInflamX Plus 360° Pineapple/Banana
Metagenics UltraInflamX Plus 360° Pineapple/Banana
Pure Encapsulations Uric Acid Formula
Designs For Health Vessel Forte™
Vitabase Vision Support
Integrative Therapeutics Vitamin C with Quercetin