Customer Ratings & Reviews

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4.7

Based on 1,766 ratings

1,430

231

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What customers say

Top positive review

PurplePegasus

Gold

Posted on Aug 7, 2010

United States

748

345

7,157

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.

(1,756)

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 6, 2023

Canada

108

Verified purchase

This is one of the best prices for quercetin, I take it regularly since Covid started to help with immunity, it helps my chronic hives as well

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 Jun 21, 2024

North Macedonia

120

good

Verified purchase

Quercetin is a wonderful supplement. Quercetin is certainly necessary for our body, as it has a number of useful properties.Normal size pills, easy to take.Quercetin is known for its antioxidant and anti-inflammatory properties. An effective daily supplement that has made a difference in boosting our immune system and respiratory health. Great quality, great size, great product, good package. I recommend this product to everyone. I'm very very satisfied.

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

Posted on Jul 7, 2025

United States

Works Well

Verified purchase

I started taking this product for my allergies. I didn't think it was doing much for me, so I quit taking it for a while. My allergies got significantly worse, so I am now a regular user and believer.

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