Customer Ratings & Reviews

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4.7

Based on 1,771 ratings

1,434

232

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What customers say

Top positive review

PurplePegasus

Gold

Posted on Aug 7, 2010

United States

748

345

7,165

Works just as well as the tablets!

This works really fast to relieve both chronic and acute allergy symptoms, from watery eyes to runny nose, sneezing and head pressure etc. I have tried many other quercetin supplements but always come back to Source Naturals as other don't work as effectively (and Dr's Best did not work at all for me). Like they say: I've tried the rest and always come back to the best. Works as well as the tablets though my body took a while to get used to the caps from tablet form.

Top critical review

iHerb customer

Posted on Mar 19, 2018

Australia

Good formula though not good value

Quercetin is an absolute must for anyone with allergies and inflammation. It works beautifully. This formula is good though not good value. You need to take at least 2-3 capsules at a time. The other brand I was using has 600mg of Quercetin, 200mg bromelain. One tablet worked super! Might go back to the other brand.

(1,761)

iHerb customer

Posted on Aug 20, 2021

Cambodia

Verified purchase

GOOD PRODUCT

SarahK444

Silver

Posted on Mar 3, 2026

United States

197

Cold season

Verified purchase

Great to add for immune support. This antioxidant helps with inflammation and detoxing when germs are spreading helps keep me feeling healthy & strong! No weird taste & trust this brand.

iHerb customer

Posted on Nov 2, 2025

Bosnia and Herzegovina

Great!!!

Verified purchase

This supplement comes in easy-to-swallow capsules, with each serving delivering 1 g quercetin plus bromelain, vitamin C and magnesium to support immune and seasonal balance. Good ingredient ! The packaging is straightforward and available in multiple sizes. Quality feels solid, and capsules have jo taste. Many benefits. So i recommend this quercetin.

iHerb customer

Posted on Oct 15, 2025

Canada

Balances immune functions, reduces inflammation

Verified purchase

I take this daily with other immune system supplements +10,000+ IU vit D3. I have very very low baseline inflammation and have not been sick at all for years. Not VAAXED and no effects from COVID, flu, colds at all.

iHerb customer

Posted on Sep 25, 2025

Poland

Verified purchase

Quality is super! The ingredients are great! Size arranged! What you need! Performance is felt! the product arranged, perfectly packed, the effect is definitely there! I will order more! Just as quickly delivered

iHerb customer

Silver

Posted on Aug 8, 2025

Hong Kong

165

Convenient choice

Verified purchase

Quercetin is a flavonoid found in vegetables and fruits, mostly in onions, apples, berries etc. Quercetin has antioxidant and anti inflammatory properties, which are good for the overall body health.

iHerb customer

Posted on Aug 3, 2025

Thailand

Good quality

Verified purchase

Activated Quercetin by Source Naturals is a regular size capsule with some slight smell but not too strong. It is recommended to ease inflammation and boost immunity. No side effect so far.

Kristie

Posted on Jul 28, 2025

Australia

Wonderful

Verified purchase

This product has helped immensely with my MCAS as it is a mast cell stabiliser. It is very effective, equally effective as the allopathic medication my Dr advised me to take.

iHerb customer

Silver

Posted on Dec 2, 2024

Australia

132

Verified purchase

I'm in love with quercetin as it helps regulate my immune system. (I have sub-cutaneous lupus and probably MCAS, which mean my skin can get very itchy and irritable and break out in sores. I do take other medicine as well, but am convinced the quercetin is playing a part in the regulation.) I am not sure why they call this one "activated" - presumably because they have included bromelain which helps with absorption - funny marketing though. Initally I made the mistake of not taking enough. Then I found a study that got a strong effect with MCAS using a dose that amounts to close to 2gm for my 60kg body weight, so now I take 1760mg a day, and this is the sweet spot for me. I just get whichever brand is on special.

iHerbCustomer

Silver

Posted on Aug 27, 2024

Bahrain

276

excellent

Verified purchase

i take this supplement cause i suffering from eczema on my hands and sometimes it spread so this formula helps to reduce inflammation histamine rather than taking cortisone and chemical medicine. much much benefit with quercetin i like this brand cause it high quality! clean ingredients good packaging. highly recommended

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