Quercetin is generally considered safe. Side effects may include headache and upset stomach Preliminary evidence suggests that a byproduct of quercetin can lead to a loss of protein function. Very high doses of quercetin may damage the kidneys.
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What are side effects associated with using quercetin?
What Are Side Effects Associated with Using Quercetin? Headache (oral use) Numbness and tingling (oral use) Shortness of breath (intravenous use) Nausea and vomiting (intravenous use) Kidney damage (intravenous use greater than 945 mg/m2).
Is quercetin safe to take daily?
When taken by mouth: Quercetin is possibly safe for most people when used short-term. Quercetin has been safely used in doses up to 1 gram daily for 12 weeks It’s not known if long-term use or higher doses are safe.
Does quercetin interfere with medications?
You may get too much, especially since quercetin is in so many foods. Interactions. Be careful if you are taking drugs such as antibiotics, cyclosporine, warfarin, or drugs that are changed by the liver Quercetin may change how these drugs work and raise the risk of side effects.
Does quercetin make you gain weight?
Quercetin was supposed to be an activator of oxidative metabolism  and it also may inhibit adipogenesis . But taken together, our data show that quercetin is not able to decrease either weight gain or feed efficiency as hypothesized, because no differences were found between placebo and the quercetin group.
Does quercetin affect sleep?
In contrast, the increase in non-REM sleep induced by quercetin was not affected by i.c.v. injection of bicuculline. Therefore, the present results suggest that quercetin alters the sleep-wake cycle partly through activation of GABA(A) receptors.
Can quercetin cause liver damage?
Quercetin as a nutritional supplement is well tolerated and has not been linked to serum enzyme elevations or to episodes of clinically apparent liver injury.
Should quercetin be taken on an empty stomach?
Quercetin can have mild side effects like an upset stomach or headache, particularly if you take it on an empty stomach If you take prescription medication, consult with your doctor before adding quercetin to your regimen, as drug interactions can cause additional side effects.
Is quercetin the same as coq10?
Just like quercetin, CoQ 10 showed antioxidant effects in our study on human nasal mucosal cells OTMs were reduced significantly by both concentrations used after cells were stressed by oxidants. No significant difference was found between the two concentrations (1 μM and 10 μM).
Is quercetin good for immune system?
Quercetin is known for its antioxidant activity in radical scavenging and anti-allergic properties characterized by stimulation of immune system , antiviral activity, inhibition of histamine release, decrease in pro-inflammatory cytokines, leukotrienes creation, and suppresses interleukin IL-4 production.
Can quercetin raise blood pressure?
Quercetin seems to decrease blood pressure.
What is the best form of quercetin to take?
The optimal effective dose of quercetin reported to have beneficial effect of lowering blood pressure and inflammation is 500 mg of the aglycone form.
What food has the most quercetin?
Quercetin is contained in abundance in apples, honey, raspberries, onions, red grapes, cherries, citrus fruits, and green leafy vegetables . Among vegetables and fruits, quercetin content is highest in onions. The bulb color and type seems to be a determining factor for quercetin concentration in onions.
Does quercetin make your poop smell?
The only side effect is it makes your poop smell like rubber because it is a sulfur compound.
Can you lose weight on quercetin?
Quercetin reduces oxidative damage to fats and cholesterol, which deters fat accumulation and reduces cholesterol’s stickiness and ability to block arteries. Research studies confirm that quercetin is valuable for weight loss , and for achieving an optimal weight and BMI.
How does quercetin affect the thyroid?
Quercetin acts as a rat thyroid disruptor with anti-thyroid properties both in vitro and in vivo. Quercetin decreases the expression of the thyroid-restricted genes, NIS, TSHR, TPO and TG in FRTL-5 thyroid cells.
Does quercetin cause anxiety?
Aside from antioxidant properties, quercetin also has an anti-inflammatory activity on some animal models , . Moreover, several studies have reported that quercetin affects some behavioral responses, such as depressive-like and anxiety-like behaviors induced by physical stress , , .
How long does quercetin stay in your system?
Human subjects can absorb significant amounts of quercetin from food or supplements, and elimination is quite slow, with a reported half-life ranging from 11 to 28 h . The average terminal half-life of quercetin is 3.5 h .
Does quercetin lower blood pressure?
The quercetin-induced lowering of systolic blood pressure observed in stage 1 hypertensive subjects (27.2 mm Hg) is clinically relevant because reductions of this magnitude are associated with a decrease in mortality of ;14% from stroke and ;9% from coronary heart disease (40).
Is quercetin an antiviral?
Quercetin displays a broad range of antiviral properties which can interfere at multiple steps of pathogen virulence -virus entry, virus replication, protein assembly- and that these therapeutic effects can be augmented by the co-administration of vitamin C.
Can you take NAC and quercetin together?
This is why quercetin should always be co-administered with vitamin C and NAC When taken together, these nutrients have a synergistic effect beyond what any of them can provide individually.
What are the benefits of quercetin supplements?
Possible health benefits of quercetin include: Fighting free radicals. Quercetin has antioxidant properties… Reducing inflammation… Reducing the risk of cancer… Preventing neurological diseases… Relieving allergy symptoms… Preventing infections… Reducing the risk of heart disease… Lowering high blood pressure.
Can you take coq10 and quercetin together?
In spite of the elevation of glucose, quercetin may be effective in reversing some effects of diabetes, but the combination of quercetin + coenzyme Q10 did not in- crease effectiveness in reversing effects of diabetes.
Does quercetin lower cholesterol?
Test tube studies show that quercetin prevents damage to LDL cholesterol , and population studies show that people who eat diets high in flavonoids have lower cholesterol. One study found that people who took quercetin and an alcohol-free red wine extract (which contains quercetin) had less damage to LDL cholesterol.
Does quercetin cause diarrhea?
Be warned: this product can give you severe diarrhea.
Does quercetin lower blood sugar?
Quercetin reduced the plasma glucose level at a dosage ≥ 500 mg/day on meta-analysis in patients with the metabolic disorder . In addition, quercetin oral administration (250 mg/day) improved the antioxidant status in T2DM .
Is quercetin good for hypothyroidism?
However, concerns have been raised about the potential toxic effects of excessive intake of quercetin, and several studies have demonstrated that flavonoids, included quercetin, can interfere with thyroid function In a previous report, we showed that quercetin inhibits thyroid-cell growth and iodide uptake.