








🛡️ Unlock elite immune defense with nature’s most bioavailable quercetin!
Thorne’s Quercetin Phytosome harnesses a cutting-edge phytosome delivery system to provide 20 times greater absorption of quercetin, a potent plant flavonoid from Sophora japonica. Designed for year-round immune support, respiratory health, and seasonal allergy relief, this third-party tested supplement is trusted by elite athletes and healthcare pros alike to help regulate histamine, reduce inflammation, and combat oxidative stress.


















| ASIN | B0797DQTVZ |
| Best Sellers Rank | #7,495 in Health & Household ( See Top 100 in Health & Household ) #25 in Polyphenol Antioxidant Supplements |
| Customer Reviews | 4.7 4.7 out of 5 stars (2,297) |
| Date First Available | June 5, 2014 |
| Item model number | SB335 |
| Manufacturer | Thorne Research |
| Product Dimensions | 2.09 x 2.09 x 3.72 inches; 2.08 ounces |
S**Y
These were exactly what I needed after 5 months of torture
My eustachian tubes have been full of velcro/rice krispie sounds for 5 months. It distorted sounds and the crackling noises every time I yawned or swallowed was so maddening. Learned there was an inflammation in the narsopharynx and now my eosinophils were chaotic and wouldn't calm and kept re-inflaming tissue on their own. I learned that quercetin inhibits the eosinophils so they can "realize" that there is nothing no longer wrong and go back to my normal range. After two weeks of use FINALLY the tube blockage dissipated and function nearly as they should since the eosinophils are finally chilling out and going back to normal numbers. I am nearly recovered and no longer hear crackling in my ears. BLESS THESE PILLS.
G**P
Great quality
Thorne makes a great product.
R**K
Been using since covid
Works as advertised Reliable brand.
S**M
Great product
Really like this brand.
M**T
Can’t go wrong with Thorne.
It’s hard to say, cause I’m taking so many supplements, but anything by Thorne is top quality.
@**H
good product
good product
T**8
Works!
No more nightly hives!! I just hate I have to take another supplement until I figure out what is going on when I don’t take it.
S**A
Good brand
I bought it twice
J**Y
Excellent product
J**Y
I'm a long-perm consumer of anti-depressant and anti-enxiety meds. This Thorne product appears to have have given me the boost that prescription meds cannot match. Such has been the positive change in the six weeks since I began taking it, I am reluctant to put it all down to Quercetin, but I haven't had a single bad day since starting them. Before this, I rarely had a good day. I will update in a few months.
A**!
Great supplement. Allergies (nasal) vanished and no side effects. Helped me get over colds n coughs quicker. A super natural antihistamine and anti-inflammatory 🙌.
P**Y
I was taking this for my allergies and I don’t see any difference… I got on to antibiotics to reduce my allergies. But maybe a continued use of this supplement before the allergy season might help.
L**Y
Fab would recommend
Trustpilot
3 weeks ago
1 week ago