Who Should Not Take Quercetin?

Quercetin is a flavonoid found in plants, fruits, and vegetables. It is an antioxidant that can help to relieve the symptoms of allergies, asthma, and hay fever.

There are some people who should not take quercetin. These include people with kidney or liver disease and those taking anti-coagulant medications such as warfarin. Pregnant women should also consult their doctor before taking quercetin because it has not been studied in this population.

People who want to use quercetin supplements should be sure that they are not allergic to the drug or any other substances in it.

How Does Quercetin Work?

Quercetin is a natural plant compound that may have antioxidant properties. Its antioxidant properties help to protect the body from oxidative stress. Quercetin works to prevent the oxidation of LDL cholesterol, which can cause atherosclerosis and heart disease. It also has anti-inflammatory effects in the body, which may help with pain and swelling caused by arthritis and other chronic inflammatory conditions. 

Quercetin for nasal congestion has been found to help treat the symptoms of allergies, colds and the common flu. It is known to help relieve the severity of these illnesses by opening up airways that have become narrowed from swelling or irritation. Quercetin also got some notoriety for its ability to reduce prostate cancer risk in men who are at high risk for this disease because of their family history or other genetic factors.

Quercetin Supplements are Beneficial – But Not for Everyone

Quercetin has many benefits for our body, including improved memory, but too much of it can cause nausea and diarrhea (more on that in the “dosage” section). As with anything, , it’s important to know the proper dosage and to look for natural sources instead of supplements. The most common source of quercetin is from foods like red wine, green tea, grapefruit and onions. Always be sure to consult with your doctor before adding anything new into your diet, especially when you have any health concerns or allergies.

Is Quercetin Safe?

It’s important to know what the side effects of quercetin are before taking it as a supplement. Quercetin may cause nausea, diarrhea, headaches and dizziness when taken in high doses. It may also interact with other medications such as blood thinners and diuretics. However, for most people, quercetin seems to be safe. It should not lead to any side effects as long as you do not take high doses, such as more than 1,000mg per day.

Quercetin Dosage – How Much is Too Much?

As mentioned, quercetin is safely tolerated in dosages lower than 1,000mg. This dosage has been safely used in studies for up to 12 weeks. However, if you want to use quercetin for prolonged periods of time, it’s smart to stick to lower dosages such as 200-300mg of quercetin per day. It’s important to remember that we also get some quercetin from food, so additional supplementation may not always be necessary. Especially if you’re already eating plenty of quercetin-rich foods. You can take quercetin at any time of the day. If you want quercetin to kick in faster, try taking it on an empty stomach.

Who Should Not Take Quercetin With Bromelain?

The answer to who should avoid taking quercetin with bromelain is the same as the answer to who shouldn’t take quercetin. People with bleeding disorders, those with kidney issues, and breastfeeding and pregnant women should all avoid taking quercetin with bromelain, unless otherwise told by their doctor.

Tired of Chronic Pain and Inflammation?

– Click to See Our Current 3 Highest-Rated Joint Supplements –


    • Hi Molly,

      That’s something that you need to check with your doctor depending on your health status and any medications you take.

      With that said, everything you listed sounds OK and they can be combined together, yes.


      Keefe Memorial Staff

Leave a Reply

Your email address will not be published.