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Natural supplements are growing in popularity with many turning to them to get the extra boost of goodness they need to improve their health or perform better throughout the day. Quercetin supplements are one type of antioxidant becoming more popular. 

What is Quercetin?

Quercetin is a natural antioxidant that fights free radicals in the body. Damage caused by free radicals has been linked to cancer and heart disease.

It has also been linked to weight loss, further demonstrating how taking quercetin supplements can help you reduce the risks of experiencing any serious illnesses or health implications. The supplement can boost your immune system and reduce inflammation.

Quercetin is found in many fruits and vegetables, however, fruit and vegetables don’t contain as high a concentration of antioxidants as dietary supplements do. Therefore taking a quercetin supplement is of great advantage to your general health.

There is one problem though. How do you pick the right supplement? With so many on the market, it can be hard to find the best one. That’s where we come in.

The List

We have done the research for you and found the best quercetin supplements available. We have put the best into a guide looking at what each supplement offers and what you can expect.

At the end of this article, we have also included a handy buyers guide and answered some of the most frequently asked questions. 

1. Peak Performance Quercetin Phytosome Capsules

The Peak Performance quercetin supplement also makes use of phytosome technology to provide a supplement with an outstanding absorption level. The supplement that is easily absorbed by the stomach is derived from Sophora japonica plant extract.

It is an effective antioxidant that supports regular histamine levels to provide a balanced immune system and effective allergy response.

We appreciated how this supplement has been third-party tested. This gives us a user peace of mind that we can trust what we are ingesting. When we reviewed the product we were also pleased to find that the supplement is vegan formulated.

Being produced to suit everyone and without the presence of preservatives is a huge bonus and one that makes a lot of people choose this supplement. 

Though the Peak Performance quercetin capsules work excellently well to protect your immune system and prevent allergies there has been limited research to show how effective these capsules are at reducing the risk of heart disease or cancer.

Despite this small downside, overall this supplement is easily one of the best supplements available, and thanks to its rigorous testing we know it works. 

Other Ingredients

  • Microcrystalline cellulose
  • Leucine
  • Silicon dioxide
  • Cellulose 
  • Water


  • Strong absorption– The supplement easily passes through the gut barrier.
  • Vegan formulated– This supplement is 100% suitable for vegetarians and vegans.
  • Third-party tested– Third-party testing shows this product is effective, safe, and trustworthy.
  • Formulated in the USA


  • No Food and Drug Administration evaluation– Peak Performance’s supplement hasn’t been evaluated by the Food and Drug Administration. However, this is the case with other quercetin supplements.

2. Thorne Quercetin Phytosome Capsules

The first quercetin supplement on our list is the Thorne Quercetin Phytosome capsule. This quercetin supplement offers advanced phytosome technology which allows superior absorption and utilization in the body compared to regular quercetin. 

This supplement is great for anybody who suffers from allergies as it stabilizes mast cell membranes, which in turn decreases the release of histamine. By decreasing the release of histamine the supplement can offer nutritional support to individuals.

Other benefits of this supplement include cardiovascular support and protection of the gastrointestinal tract. It does this by reducing the incidence of oxidative damage to the skin. 

Consumed by taking 1 capsule two or three times a day with a meal we found this supplement to be quite impressive. The stand-out feature has to be its advanced phytosome technology. The patented process used to produce this supplement is excellent, making a supplement that’s much more effective and fast-acting than similar products available. 

The quercetin phytosome is created by combining sunflower-sourced phospholipids with quercetin. This creates a complex phytosome capable of easily crossing the gut barrier.

Other Ingredients

  • Leucine
  • Microcrystalline Cellulose
  • Hypromellose capsule
  • Silicon dioxide


  • Phytosome Technology– This creates a fast-acting and effective supplement.
  • Health Benefits– Thorne Quercetin Phytosome reduces the risk of heart disease, swelling, and allergies.
  • Natural– This supplement contains naturally sourced ingredients.


  • Unpleasant odor in urine– Some users of this supplement have reported experiencing an unpleasant smell in their urine. 

3. Natural Factors Bioactive Quercetin EMIQ

Natural Factor is a brand committed to using the very best ingredients to create high-quality products that meet and exceed customer expectations. Their quercetin supplement is designed to reduce oxidative stress on your body.

Studies have also shown that this supplement has anti-inflammatory benefits that help protect the heart and reduce the risk of various heart diseases.

Like the other supplements on this list, Natural Factors quercetin supplement also offers great improvements to your immunity. 

Each jar of this supplement contains 60 capsules. By taking 1 50mg capsule two or three times a day you can expect to see great results in no time at all. When testing this capsule we were impressed by the impact it had on general cardio health.

The capsules help maintain healthy blood pressure levels and support respiratory functions. This is perfect for those of you who want improved performance in your daily lives and more efficient cardio performance. 

Using advanced technology and third-party approval the supplement has been independently tested for over 700 contaminants to ensure the product is pure and potent. We are pleased to say it most definitely is. 

Other Ingredients

  • Vitamin C
  • EMIQ (Enzymatically Modified Isoquercitrin)
  • Microcrystalline Cellulose
  • Vegetarian capsule
  • Magnesium stearate


  • Rigorously tested– This supplement has been rigorously tested to ensure it’s effective and safe to ingest.
  • Heap of health benefits– Natural Factors have produced a quercetin supplement packed with health benefits.
  • More effective than normal quercetin– The supplement is much more potent and effective than normal quercetin supplements.


  • Weaker allergy benefits– Users have noted that other supplements have a stronger impact on their allergies than this one.  

4. NOW Foods Quercetin With Bromelain

NOW Foods is a leading health food supplement brand. It’s not hard to see why when you see the quality of their products. The quercetin supplements from NOW Foods are created with pure quercetin and standardized to 90% purity. This is great because it allows you to achieve a consistent dose every time you take it. 

Like the other supplements on this list, this supplement works wonderfully well when it comes to supporting your immune system. The potent capsules work efficiently to offer you a healthier way of living.

You can expect to experience a more upbeat feel, a reduced risk of heart diseases, improved immunity, and a drastic reduction in your allergies.

This supplement actually contains Bromelain unlike others on the list. Bromelain has a long history of being used by herbalists as it is known to support a balanced immune system response to environmental challenges. 

We appreciated how each bottle of NOW Foods quercetin supplement comes with 240 capsules. This gets the user the most out of their money.

Other supplements cost the same but only come with 60 capsules. Take two tablets twice daily if you want to experience the best results.

Other Ingredients

  • Rice flour
  • Hypromellose
  • Microcrystalline Cellulose
  • Magnesium Stearate
  • Silicon dioxide


  • Produced by a leading brand– NOW Foods are a leading health food supplement brand.
  • Pure– This supplement has high purity levels.
  • Affordable– You get a lot of capsules for your money.


  • No phytosome technology– The lack of phytosome technology might make this supplement less effective than the others on our list.

5. Sandhu’s Zinc Quercetin

Best Quercetin And Zinc Supplement

This brand of quercetin supplement is one of the most potent on the market. Arguably one of if not the best quercetin supplements, Sandhu’s Zinc Quercetin incredibly has 400 mg per capsule, along with gelatin and magnesium stearate as inactive ingredients.

It is the only supplement on this list that contains zinc which studies have shown has a positive impact on weight loss. 

Zinc is necessary for the metabolism of carbohydrates, protein, and fat, with the body also using zinc to make testosterone which helps keep energy levels up. If you’re looking for an energy boost this could be the supplement for you. 

That’s not all this supplement can do. Like the other supplements we have spoken about, this quercetin supplement also has positive health benefits in relation to a balanced immune system, improved cardiovascular health, and improved respiratory health. 

The dosage for this supplement is three capsules daily but you can take more if you find it necessary. 

Other Ingredients

  • Vegetable Cellulose Capsule
  • Microcrystalline Cellulose
  • Magnesium Stearate


  • Contains zinc– Zinc contains a number of great health benefits.
  • Variety of health benefits– This supplement probably has the most health benefits.
  • 400 mg capsules– There is a lot more per capsule with this brand of supplement. 


  • Zinc side effects– The zinc in these capsules can lead to an increased chance of side effects such as nausea. 


Although they haven’t been extensively studied it is fair to say that quercetin supplements contain a variety of ingredients that provide us with a lot of health benefits. They have been known to promote weight loss, a healthy immune system, and reduce the risk of heart disease and cancer.

With these factors in mind, we can confidently say that these supplements are well worth trying. Despite quercetin being found in many natural foods, supplements give you a more concentrated dose that will give you the boost you need.

Finding the right supplement for you can be hard but as you can see from our list there are plenty of supplements to choose from so there is definitely one out there for you.

Whether you simply want to improve your general health or combat weight loss you will find the right supplement that will give you what you need. 

Now you have our list of the best quercetin supplements narrow it down so that you make the right purchase for yourself.

The right supplement will give you exactly what you need but just remember changes take time and vary from person to person so don’t expect any miracles overnight. 

What To Look For In A Quercetin Supplement

In this buyer’s guide, you will find some useful information that will assist you further and help you buy the supplement you require. If you consider these key things you will make a decision you won’t regret. 

Quercetin Benefits

The benefits of taking a quercetin supplement mainly come from its antioxidant properties. The benefits include:

  • Potentially reduces inflammationsource
  • May ease allergy syptomssource
  • Potentially reduces blood pressuresource
  • May lower risk of chronic brain disorderssource
  • May protect from diabetes – David Sinclair has stated that when combined with resveratrol, quercetin reduces the levels of the toxic molecule methylglyoxal and protected the kidneys of rats from diabetes during testing. See a full list of Dr. David Sinclair’s supplements here.

Ingredients – What to look for in a quercetin supplement

Quercetin is often combined with other substances in weight loss supplements because it has not been known to produce any side effects when taken by itself.

You need to consider this when looking to buy your supplements, particularly if you are buying them to work on your weight management.

When looking for a quercetin supplement, look for brands that combine it with other ingredients like green tea extract or zinc because these ingredients are known to help with weight loss.

Quercetin vs Quercetin Phytosome

When looking to buy quercetin supplements you want to make sure you are purchasing the product that works most effectively and efficiently. Though standard quercetin works very well, quercetin phytosome works even better.

Phytosome technology has been designed to allow superior absorption and utilization in the body, unlike the normal quercetin supplements. As a result of this, we recommend you always try to find a quercetin phytosome supplement instead of the standard supplements.

Third-Party Tested

It is important that you look for the most scientifically proven, well-tested products when buying any type of supplement.

This doesn’t mean other products aren’t as good, it just simply shows that the supplement in question can guarantee more reliability as it has been tested by another source.

Companies can easily make a product sound better than it is by reviewing it themselves but if a product has been tested from an external source you know it is a trustworthy product that has backing. 


Always look at the brand you are buying off before making a purchase. Not all brands are reliable or trustworthy.

Some brands might have only just started producing supplements that are untested whilst others have been in the market for a prolonged period of time, using experts to produce their supplements.

Consider this before you make a purchase. A good way of identifying whether a brand is suitable or not is by looking at reviews, who endorse the company, and whether or not the products have been tested thoroughly or not.

You can find most of this information in the description of the product or on the brand’s official website.

Quercetin Frequently Asked Questions

How Much Quercetin Should I Take Daily?

Every brand of quercetin comes with detailed information on what dose you should take daily. This tends to differ from brand to brand, however, the most common dose tends to be approximately 500 mg a day.

This dosage is split into two or three tablets taken throughout the day. Some people may even take up to 1,000 mg a day.

Before you take any form of supplement it is advised you always contact your doctor first to see if the dose you are taking is suitable for you and whether or not it will cause issues with medication or supplements you already take.

Who Should Not Take Quercetin?

You should take periodic breaks from quercetin every so often just to ensure you don’t experience any side effects or become reliant on the supplement. There are a number of people who shouldn’t take quercetin at all.

These include pregnant women, breastfeeding women, and people who suffer from kidney disease. At doses greater than 1g a day, there have been reports of damage to the kidneys. 

What Food Contains The Most Quercetin?

Quercetin is contained in a huge variety of foods. These include apples, honey, onions, red grapes, raspberries, cherries, citrus fruits, and green leafy vegetables. In regards to which food contains the most quercetin, that would have to be onions.

Onions contain a high concentration of quercetin making them a great natural source of antioxidants. If you’re not a big onion lover the next best thing to eat is apples. Apples also contain a great concentration of quercetin that will help you lead a healthier lifestyle. 

What Are The Side Effects Of Taking Quercetin?

Quercetin has a number of side effects that it is worth knowing about. Though there are a variety of mild and more serious side effects it is worth noting that very few people experience any side effects and when they do they are usually very mild.

If you are unfortunate enough to experience any side effects that seem to occur frequently, immediately stop taking the supplement before getting in touch with your doctor who will decide the best course of action. Here are the most common side effects.

– Headache
– Numbness or tingling
– Nausea and vomiting
– Kidney damage
– Shortness of breath

Disclaimer: this article does not constitute or replace medical advice. If you have an emergency or a serious medical question, please contact a medical professional or call 911 immediately. To see our full medical disclaimer, visit our Terms of Use page.

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