Quercetin User Reviews & Ratings

• AZ ...
• Taken for 1 to 6 months
• May 26, 2021

For Herbal Supplementation "My NMD suggested Quercetin to me at a dose of 500mg 3 times a day. I only have taken 500mg once a day. This stuff gave me bad side effects of mild dizziness, mild nausea, and difficulty sleeping. I am sensitive to many supplements, so this is not a condemnation of Quercetin for all, but beware, this stuff can cause side effects and make you feel lousy!"

• Jul...
• Taken for less than 1 month
• September 10, 2021

For Herbal Supplementation "It took a while for me to put it together, but this supplement caused pretty significant heart palpitations and racing heart. The brand I used was by Toniq if that has an effect. I'm sensitive to caffeine in that way, but I do not use caffeine. I didn't use long enough to see a benefit. I figured the connection to heart palpitations after about 10 days. Sorry it took so long."

• Anonymous
• Taken for 1 to 6 months
• January 14, 2022

For Herbal Supplementation "It has taken me much too long to realize I had 7 side effects: palpitations, rise in blood pressure, pounding in my ears, nervousness, heavy legs, dizziness, and blurred vision. I am struggling here, and I don't know how to get relief now. I will never take it again. I am really sensitive to all kinds of supplements and pills."

• Mit...
• Taken for less than 1 month
• January 13, 2022

For Herbal Supplementation "My family started taking a once daily, 800 mg quercetin/165 mg bromelain capsule, along with 1000 mg vit c (lypospheric) sachet, and a zinc powder as a prophylactic. After a couple of weeks, it became apparent that our energy levels were reduced, and we became listless, and dare I say, mildly depressed, having no inclination to do anything during the holidays. My wife also experienced headaches. We stopped the Quercetin, and within a few days, energy levels seemed restored, and we feel a great deal more energetic. This may be unrelated to Quercetin, but I felt it worth mentioning, so you may monitor your own feelings."

• Top...
• Taken for 1 to 6 months
• June 29, 2022

For Herbal Supplementation "Started taking this after hearing about it from an internet guru. I have a slow heart rate to begin with. This stuff slowed it down in the 40s. I believe many experience dizziness from either bradycardia or tachycardia caused by this supplement. I also had problems sleeping, as well as leg pain. Literally every side effect listed. Don't use this. There are beneficial flavonoids in fruit that won't cause all of this mess."

• Cat...
• Taken for less than 1 month
• June 26, 2022

For Herbal Supplementation "Taking this for my seasonal allergies and histamine tolerance combined with Zinc and C. It opens my nose right up, gives me energy, and increased my mood. I also feel much better, focused, and no brain fog, and can tolerate more foods. However, this makes you poop after 30 minutes of taking one pill. Gives cramps, bloating, and gas. Honestly, it’s too bad since it is helping with other symptoms, inflammation, and food intolerance. I have to take it before bed since taking it during the day is impossible with those GI issues. Too bad."

• Mar...
• Taken for 1 to 6 months
• December 30, 2022

For Herbal Supplementation "I had been having problems with always feeling cold, especially my feet. I always had to wear a hoodie or a sweater to keep warm and sleep with a heated blanket. 74 degrees room temperature, and I was freezing. I started taking Quercetin, and I am no longer cold. My energy level is up—no more brain fog. Pain levels have decreased. I have had no side effects from taking it."

• two...
• Taken for less than 1 month
• March 11, 2023

For Herbal Supplementation "I was put on a popular natural antihistamine for sinus allergies and other symptoms of higher histamine levels as I'm entering menopause. The product contains quercetin as a main ingredient. After three days of use, I'm feeling very sick. On and off upset stomach, woozy head/headache, greater fatigue, and overall feel ill all over. I'm fairly reactive to things and have a sensitive stomach. I'm stopping the supplement and going back to my 1/2 Benadryl at bedtime."

• Flo...
• Taken for 1 to 2 years
• November 28, 2022

For Herbal Supplementation "I have been taking a range of supplements during the Covid episode (vitamins B, C, D, magnesium, zinc, Quercetin, Cosamin, Qunol, ARED-2, and turmeric) plus two prescription meds for high blood pressure. Sometimes I would eat something late, but always took all my pills just before bed. Usually, my sleep was bad, and I would awaken a lot with nausea and digestive discomfort. Sometimes more, sometimes less. Recently, I thought the pills might be causing the problems, so I switched to taking them at noon. My sleep abruptly became long, sound, and comfortable -- but now I began feeling ill and nauseated in the late afternoon and diarrhea into the evening. So then I tried only one of the supplements per day. I discovered that it is Quercetin 800 mg with bromelain that does this to me. Checking Quercetin side effects online, I may have some of them too -- nighttime skin itching, leg and ankle swelling, leg pains, and blood pressure increases. Still testing those."

• Jul...
• Taken for 1 to 6 months
• June 19, 2022

For Herbal Supplementation "In combination with bromelain and vitamin C, I noticed that Quercetin made a positive difference in ease of breathing, but it took some time to be effective. It’s been a year since I took it, but I now have breathing issues a few weeks after COVID, so I will try again."

• Jef...
• Taken for 1 to 6 months
• January 16, 2023

For Herbal Supplementation "Cardiologist prescribed Flecainide for my arrhythmias. The only med that worked for me in the hospital. But after a few months, the side effects came out. I started to take Quercetin with bromelain, along with some Chinese herb supplements. My heart now has normal function without taking Flecainide."

• Twi...
• Taken for less than 1 month
• April 17, 2023

For Herbal Supplementation "Started taking an immunity-boosting supplement today with 200 mg Quercetin. After an hour, had nausea to the extent that I thought I would lose my breakfast, but it passed. Will try again tomorrow. Everything except Q I’ve taken before, so I’m suspicious."

• Oti...
• Taken for less than 1 month
• February 25, 2024

"I have only been taking this for 10 days now but seems to help with Mast Cell Activation Syndrome and high histamines. Taking it along with DAO supplement. It allows me to eat some different foods that are higher in histamines. It does seem to give me soft poop and more often. Not sure if that's good or bad yet! Taking 500 mg with bromelain for better absorption twice a day with meals. Easy to swallow."

• LHL...
• Taken for less than 1 month
• December 1, 2022

For Herbal Supplementation "I took 500 mg for the first time this morning, for anti-inflammatory properties. Also took it with my normal probiotics and an NAC that I've been taking for immune support. I was hoping for an energy boost and skin benefits as well. This definitely made my heart race a bit, but it didn't last too long. My mother-in-law loves this stuff. Too soon to tell if it's beneficial for me or not. Would like to give it a go again."

• Sid...
• Taken for 1 to 6 months
• May 17, 2022

For Herbal Supplementation "Had to stop. Heart palpitations, headaches, nausea, and sleeplessness. Took me a while to realize it was the Quercetin."

• Mem...
• Taken for 1 to 6 months
• December 21, 2021

For Herbal Supplementation "It seems to upset my stomach lining. Hurts! But it sure helps my chronic year-round rhinitis. Opens my nose right up."

• Sdu...
• Taken for less than 1 month
• February 21, 2022

For Herbal Supplementation "I took one 500 mg Quercetin and broke out in an itchy and red rash on my torso and neck. It also made my eyes itchy. This is just one hour into the dose."

• Sus...
• Taken for less than 1 month
• December 29, 2021

For Herbal Supplementation "I am very sensitive to many drugs and supplements, so I took 1/2 an Organika 400 mg Quercetin tablet with Bromelain 1 hour ago. I am fine, no side effects so far."