Customer Ratings & Reviews

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4.7

Based on 885 ratings

735

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What customers say

(152)

iHerb Customer

Silver

Posted on 24/07/2025

Australia

107

A trustworthy brand

Verified Purchase

Thorne is a brand I trust. I notice less inflammation. I went with Thorne for this as I have suspected MCAS and hoping to see improvement in symptoms.

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iHerb Customer

Gold

Posted on 8/01/2026

Australia

381

Прекрасно!

Verified Purchase

Thank you very much for this product, it suited me, I like the packaging, comfortable and stylish, I will order more of these products, and recommend them to all my friends and relatives! good!!

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Mrmr

Gold

Posted on 1/01/2026

Saudi Arabia

406

327

125

very good

Verified Purchase

The product quality is good... It consists of Quercetin Phytosome, the best type of Quercetin in terms of absorption, in addition to the presence of Bromelain, which further aids absorption... I take two capsules a day and feel an improvement in allergy symptoms... as histamine levels have decreased.

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Silver

Posted on 11/08/2025

Japan

136

For anti-aging

Verified Purchase

Because it's phytosome-based, it's absorbed 20 times faster than normal. It's also said to be effective against viruses and for the immune system, so I highly recommend it. I always trust this manufacturer because of their high-quality ingredients.

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iherbmkua

Gold

Posted on 15/04/2026

Ukraine

1,447

245

Great

Verified Purchase

Thorne, quercetin complex. A quality brand with a good formula. I used it during an allergy attack and found relief. The capsules are small and convenient. However, the price is high. And the effect varies from person to person; not everyone will notice it.

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taigastar

Posted on 15/04/2026

Luxembourg

Great for allergies

Verified Purchase

This is a great quercetin for allergies. It really helps with the addition of bromelain. The phospholipid layer also helps with absorption. For strong allergies I do have to take more capsules than recommended though.

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iHerbCustomer

Posted on 28/01/2026

South Korea

Quercetin is the ultimate allergy and inflammation fighter! The phytosome + bromelain combination is truly exceptional.

Verified Purchase

I suffered from stuffy nose, sneezing, and itchy eyes every spring and fall, so I tried Thorne Quercetin Complex for the first time. Regular quercetin wasn't as effective, but I chose this phytosome formulation because it's easier to absorb... and it's a real game-changer! Quality: The Thorne brand is highly trusted, and it's gluten-, soy-, and dairy-free, and certified non-GMO, so you can take it with confidence. I trust it because it uses high-quality American ingredients. Ingredients: The combination of 250mg of Quercetin Phytosome (Sophora japonica flower extract + sunflower phospholipid complex) and 100mg of Bromelain is fantastic. Quercetin stabilizes mast cells and suppresses histamine release, while bromelain aids absorption, helps with inflammation, and reduces swelling. It's also said to be good for antioxidants and immune balance. Size: The capsules are small and soft, making them easy to swallow. One to three capsules are recommended per day, but I take two without any problems! Quercetin: Previous products had minimal effects, but this one significantly reduced my nasal and eye symptoms within a week or two of taking it. It's not only effective for seasonal allergies, but also reduces inflammation and fatigue, and I think it's also great for anti-aging. (Inflammation is reduced and skin condition slightly improves!) Packaging: The white bottle with an orange label is clean and classy. 60 tablets are enough for a one- to two-month supply, and the tight-fitting lid makes it easy to store without worrying about oxidation. Overall, I'm very satisfied! I highly recommend this to anyone with allergies or looking to manage inflammation and immunity.

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iHerb Customer

Posted on 7/11/2025

China

Quercetin is effective.

Verified Purchase

I've heard this quercetin has a complete ingredient list and is of good quality. The packaging is beautiful. Since it's said to be helpful for the respiratory and immune systems, effective against inflammation, and has antioxidant properties, I decided to give it a try. The capsules are light green and odorless. I hope they will reduce respiratory illnesses and improve my overall health during the autumn and winter seasons.

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Carina

Silver

Posted on 30/08/2025

United Arab Emirates

115

Targeted Anti-Aging & Inflammation Support

Verified Purchase

“My main goal with Thorne’s Quercetin Complex is anti-aging and inflammation control. Quercetin is well studied for its antioxidant effects, which help reduce oxidative stress — one of the main drivers of cellular aging. It also supports vascular health, immune balance, and histamine response, which makes it useful for both long-term wellness and seasonal allergy relief. I chose this product because it combines quercetin with vitamin C and bromelain, which improve absorption and boost its effectiveness. Since starting, I’ve noticed steadier energy, reduced inflammatory flare-ups, and a general feeling of resilience. This isn’t a one-time repair — it’s a maintenance supplement. The benefits build over time with consistent daily use, which aligns perfectly with my anti-aging routine.”

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iHerbCustomer

Silver

Posted on 3/08/2025

Thailand

152

Verified Purchase

Quercetin is a powerful antioxidant from the flavonoid group, which has anti-inflammatory, anti-allergic and immunomodulatory properties. It is found in many plant products. It is found in large quantities in raw onions👍

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Customer Ratings & Reviews

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