Quercetine Gold


Quercetine Gold is geproduceerd volgens (doping)normen van het NZVT systeem en bevat daarom het NZVT logo. Quecertine Gold kan dus met zekerheid door topsporters gebruikt worden.

Contains 90 vegetarian capsules

In stock 229


Quercetine Gold is a dietary supplement which is developed for (professional) athletes. Consult trainer of physician for usage.

Quercetine Gold is endowed with the NZVT logo. NZVT is an abbreviation of the ‘Nederlands Zekerheidssysteem Voedingssupplementen Topsport’ (Anti Doping Authority for the Netherlands.) This certification guarantees the athlete that the dietary supplement is free of doping.


Since December 2012 we are only allowed to publish product data sheets and product information that contain approved health claims by a European scientific organization – as a result of the European regulations on nutrient claims. This limits Virtuoos’ ability to provide information, as many health effects of diets and dietary supplements are (still) not recognized by this organization as sufficiently scientifically substantiated.

Component per daily dosage
(1 capsule)
ingredient Quantity %RDA Compound
Quercetin 250 mg
 RDA = Recommended Daily Allowance


Product name Quercetine Gold
Item number 023
Health claims Specifically suitable for (professional) athletes. Virtuoos products contain vegetarian capsules. The capsules have been manufactured with cellulose (V-caps) and are thus compatible with a vegetarian lifestyle.
Dietary supplement Yes
Category Other
Price € 36,00


Guideline Daily Amount (GDA) Consult your trainer/physician for usage.
Storage Store in a dark, dry and cool place, out of the reach and sight of young children.
Warnings Do not exceed the recommended dosage. Contains caffeine. A healthy lifestyle and a varied diet are of vital importance. A dietary supplement is not a substitute for a varied diet.
Ingredients Quercetin, Micro-crystalline cellulose (filler), HPM Cellulose (capsule shell), Sunflower oil (flow enhancer), Titanium dioxide (coloring for capsule shell).
Allergy information This product does not contain any known allergens.


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Anti Doping Certificate

Quercetin is one of the most common flavonoids. It can be found in many different types of vegetable nutrition. About three-quarters of the flavonoids that are consumed during a Western diet are quercetin (Manach 2005, Sampson 2002). Foods with a high quercetin content are grapes, wine, apples, blueberries, red and white onions, black and green tea and green leaf vegetables (Boots 2008 and Kelly 2011). Quercetin is used for food coloring and concentrated forms can be found in peels and gives colors to vegetables and fruit.

A lot of research has been conducted into the biological effects of quercetin over the past 10 years. In combination with sports they especially looked at the effects quercetin has on endurance, mitochondrial biogenesis (formation of new mitochondria), the immune function and the effect on oxidative stress due to exercise.


  • The average daily quercetin intake through food varies between 25 and 50 mg.
  • The highest doses are found in elderberries, red and white onion, cranberries, kale, blueberries, apple, pear, lettuce and spinach (Nieman, 2010).
  • In order to take in 1000 mg quercetin through food , one has to eat 3.5 kg pure chocolate or drink 104 liters of red wine.
  • Quercetin has a synergistic effect with vitamin C and green tea extract (EGCG) increases the bioavailability of quercetin.

Quercetin and performance
Several meta-analyses show that quercetin can improve performance (Kressler 2011, Somerville 2017). In both analyses it was concluded that quercetin supplementation improves the performance after a period of a week or more. In the majority of the studies a dosage of 1000 mg was used. The mechanism that leads to the increase in performance is not clear at the moment. Possibly it has to do with an increase in mitochondrial biogenesis (improving aerobic capacity) or improving the vascular function and in increase in the blood circulation (Somerville 2017). Another possible explanation is that it – like caffeine – delays the fatigue by stimulating the nervous system (Kressler 2011).

Quercetin and the immune function
In the event of illness, upper respiratory tract infections are most common. This is mostly caused by viruses. Research during the Winter Olympic in 2010 and the Summer Olympics in 2012 shows that 7% of the athletes were ill during the event, most of which had respiratory illnesses (Engebretsen 2010 and 2013). In the run-up to the marathon 40% of the participants had to deal with upper respiratory infections (Nieman 1990).

Results research
Using quercetin before and during a heavy training schedule reduces the chance of upper respiratory infections. Cyclists that took 500 mg quercetin 2 times a day over a period of 3 weeks during a heavy training schedule led to fewer upper respiratory tract infections than the placebo group. The difference was 5 versus 45% (Nieman 2007).

A meta-analysis (Somerville 2016) shows that consuming flavonoids reduces the chance on upper respiratory tract infections by about 33%. No convincing evidence was found that it had effect on the duration or severity. When quercetin was used during research a dosage of 500-1000 mg a day was used over a period of 2 to 3 weeks (Somerville 2016, Nieman 2010).

Recommended dosage

  • Based on current literature, quercetin appears to support the immune function and improves performance. A normal dosage is 1000 mg quercetin a day. It is not possible to take in this amount through the regular diet, so a quercetin supplement can be used.

In what situations

  • To improve performance (at least 7 days 1000 mg).
  • To support the immune system during or after a heavy training schedule (500 to 1000 mg during and after the heavy training).

Explanation research
A double-blind randomized study among professional cyclists revealed that 6 weeks of quercetin supplementation (in combination with antioxidants) improved the time-trial performance compared to the group that only took antioxidants. The group that used quercetin had more power and completed 30 km 3.1% faster than the group that only took antioxidants (MacRea 2006). The quercetin was taken in the form of a drink that contained caffeine, green tea extract, vitamin C and other ingredients that might affect the performance. The amount of vitamin C (240 mg per 500 mg quercetin) is not too high, so it does not counteract the mitochondrial biogenesis (Braakhuis 2012, Gomez-Cabrera 2008).

A meta-analyses shows that polyphenols can improve performance. Especially quercetin looked positive in this research. The analyses of 7 studies * in which quercetin was taken (on average 764 mg per day for at least 7 days) the sports performance improved by 2.8% on average. The mechanism for the improved performance is not entirely clear as of yet. It might have to do with the increase of mitochondrial biogenesis (improving aerobic capacity) or improving the vascular function and blood circulation (Somervile 2017)

* Three of the check made