Description

Quercetin is a type of plant compound called a flavonoid (a fancy name for a plant pigment) that contributes to the natural, vibrant colors of fruits and vegetables like apples, onions, berries, and tea. Flavonoids function as antioxidants, seeking out damaging free radicals and neutralizing them.* Free radicals are caused by the daily oxidative stress placed on our bodies, and they are linked to cellular damage, accelerated aging, and chronic health conditions. 

Thorne’s Quercetin Phytosome offers the antioxidant benefits of a flavonoid, as well as its immune-supporting properties and the ability to support a healthy inflammatory response, which provides a range of health-promoting benefits.* 

As a natural compound, quercetin is typically characterized by poor absorption into the bloodstream, which is why the quercetin used in Thorne products is provided as a quercetin phytosome. A quercetin phytosome complex enhances the benefits of quercetin by utilizing phytosome technology to optimize the nutrient’s bioavailability. Thorne’s Quercetin Phytosome is up to 20 times more bioavailable than quercetin extract alone, for maximum benefit from a smaller amount.*

Who can benefit from Thorne Quercetin Phytosome

  • Anyone looking to support healthy immune function*
  • Those looking to promote recovery and a healthy inflammatory response in the respiratory tract*
  • Biohackers looking to optimize sirtuin function and decrease senescent cells*
  • Anyone wanting to support a healthy aging process*


Immune Support

Quercetin Phytosome offers a range of benefits for immune health – from general immune support to maintenance of a healthy respiratory tract.* Quercetin plays a crucial role in moderating immune function through several different actions, such as:  

  • Supporting various types of immune cells that are necessary for an optimized immune response* 
  • Supports healthy seasonal immune system function*
  • Helping to support a normal inflammatory response, particularly in the respiratory tract*  


Unique Benefits for Healthy Aging

Cutting-edge research is placing quercetin in the spotlight for healthy aging because of new research that shows quercetin helps reduce cellular senescence.* Senescent cells are malfunctioning cells that have stopped dividing but do not die and remain in the body. Environmental factors, along with regular aging, causes a buildup of senescent cells, which can be associated with biological aging and age-related disorders.
 What makes Quercetin Phytosome a healthy aging superstar:

  • Quercetin is one of only two nutrients that have been studied to reduce cellular senescence*   
  • Quercetin up-regulates sirtuins (key regulators of cellular health) associated with improved weight-related metabolic factors at the cellular level*
  • The trio of antioxidant, sirtuin, and senescence support helps optimize healthy cellular aging*


This product has been third-party tested and certified to verify what's in the package matches what's on the label and to confirm it contains no unsafe levels of contaminants, such as heavy metals, pesticides, and microorganisms.

Suggested Use:

Take 1 capsule two to three times daily with meals or as recommended by your health-care practitioner.

Warnings:

ALLERGY WARNING

This product is contraindicated in an individual with a history of hypersensitivity to any of its ingredients.

PREGNANCY

If pregnant, consult your health-care practitioner before using this product.

INTERACTIONS

There are no known adverse interactions or contraindications at publication date.

FAQs
Frequently asked question

Is Quercetin Phytosome worth buying compared to regular quercetin supplements?

Yes. Quercetin Phytosome uses a patented delivery system that significantly improves quercetin absorption compared to standard quercetin supplements. Regular quercetin has poor bioavailability, meaning your body absorbs very little. The phytosome form binds quercetin to phospholipids, making it more readily absorbed and effective. If you want to actually benefit from quercetin's antioxidant and immune-supporting properties, the phytosome version is the smarter investment.

Where can I buy Thorne Quercetin Phytosome and is it available for subscription?

Thorne Quercetin Phytosome is available directly on this page. Purchasing here ensures you receive a genuine, quality-verified product. Many customers opt for a subscription option to save on repeat orders and maintain consistent supplementation. Buying directly from an authorized retailer also ensures proper storage handling and product freshness, which matters for supplement efficacy.

What is quercetin and what does it do for the body?

Quercetin is a natural flavonoid found in foods like apples, onions, berries, and tea. It acts as a powerful antioxidant, neutralizing harmful free radicals caused by daily oxidative stress. This helps protect cells from damage linked to accelerated aging and chronic health conditions. Quercetin also supports immune function and healthy inflammatory response, making it a popular choice for overall wellness.

What is a phytosome and why does it matter?

A phytosome is a patented technology that bonds plant-based compounds like quercetin to phospholipids — healthy fats your cell membranes are made of. This makes the nutrient far easier for your body to absorb and utilize. Without this delivery system, most quercetin passes through your digestive system without being properly absorbed, meaning you get less benefit from each dose.

How should I take Quercetin Phytosome and when will I notice results?

Follow the dosage instructions on the product label, typically taken once or twice daily with or without food. Results vary by individual, but many people notice improvements in energy, immune resilience, and overall wellbeing within two to four weeks of consistent use. For best results, take it daily as part of a balanced wellness routine rather than sporadically.

Are there any side effects or interactions I should know about?

Quercetin Phytosome is generally well tolerated. However, if you are pregnant, nursing, or taking medications — particularly blood thinners or antibiotics — consult your healthcare provider before use. High doses of quercetin may interact with certain drugs. Thorne products are manufactured to strict quality standards, but individual responses can vary, so starting with the recommended dose is always advised.

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