Our Ingredients: Quercetin | LIBERTY | Supplements for high performers

Quercetin: Key takeaways

Quercetin is a flavanoid, a plant compound found in the skin of foods like onions, apples, berries and tea. [1]
Quercetin is best known as an antioxidant and its anti-inflammatory properties. [1]
Most people get relatively small amounts (10-20mg/day) from their diet alone while average recommended daily amounts range from 50 to 150mg. Thus, a daily supplement can meaningfully contribute to daily intake. [1]
Quercetin is a popular “training stack” supplement because it can support recovery from muscle-damaging exercise, which can complement creatine-based routines (creatine supports hypertrophy, quercetin supports recovery). [11] [12]
Quercetin also shows promising evidence for maintaining collagen integrity in the skin (especially under stress), and cardio-metabolic markers such as blood pressure. [5] [8] [9]
Liberty's Work Hard Play Hard and Peak Performance supplements each contain 75 mg quercetin per daily serving. [3] [4]

What is quercetin?

Quercetin is a naturally occurring flavonoid that plants produce as part of their own protection system. Humans have consumed it for centuries through foods like onions, apples, berries, capers and tea.

In nutrition research, quercetin is one of the most studied polyphenols for it support in antioxidant defenses and anti-inflammatory properties, both relevant when when physical and mental stress levels are high (due to e.g. work stress, travel, poor sleep or hard training). [1]

Quercetin had a social media moment during the COVID period where it was often discussed for its immune support. More recently it is increasingly mentioned in longevity discussions for its senolytic* potential. [13]

*A senolytic is a compound that helps clear senescent cells, which are cells that have stopped dividing but that keep sending out pro-inflammatory signals. [14]

Benefits

A powerful antioxidant
Supports muscle growth when taken with creatine
Supports collagen maintenance for healthy, firm skin
Potentially helps protect the heart and liver

A powerful antioxidant

Quercetin is best known for supporting the body’s antioxidant defenses, which helps protect the cells from oxidation and early cell death as a result of a stressful lifestyle (due to e.g. work stress, frequent travel, poor sleep, hard training or late nights). [1]

Scientific reviews describe quercetin as a widely studied flavonoid with thoroughly studied antioxidant and anti-inflammatory properties, which is the core reason it is used in modern supplement routines. [1]

Supports muscle growth when taken with creatine

Quercetin is often paired with creatine in performance routines because the two ingredients support different parts of the muscle-building process: creatine helps you train harder and build more lean mass over time, while quercetin is studied more for recovery and muscle damage support. [11] [12]

A systematic review and meta-analysis of randomized controlled trials found that quercetin supplementation can reduce markers of muscle damage and soreness after intense exercise, supporting recovery. [11] Another systematic review found creatine plus resistance training leads to small but meaningful improvements in measures of hypertrophy versus resistance training alone. [12] The realistic takeaway is that quercetin is not a "muscle builder" on its own, but supports consistency and recovery when muscle training with creatine. [11] [12]

Supports collagen maintenance for healthy, firm skin

Quercetin is commonly used in skin routines for its positive impact on collagen integrity and strength, impacting how the skin holds up under UV exposure, stress and inflammation. [8]

In a lab study using human skin tissue, quercetin reduced UV-driven signals linked to photoaging and helped prevent UV-related collagen degradation, implying that quercetin may help protect collagen structure over time. [8] This evidence is stronger for supplements that promote collagen protection (slowing breakdown) rather than “instant collagen building.” [8]

Potentially helps protect the heart and liver

Quercetin is often included in high performer health routines because cardio-metabolic markers (impacting the heart, arteries and liver) are heavily influenced by stress, sleep, diet consistency, and inflammation, which are exactly the areas that get pushed in high-performance lifestyles. [1]

A systematic review and meta-analysis of randomized trials found quercetin supplementation can reduce blood pressure. [5] For liver health, a randomized controlled trial in NAFLD reported reduced intrahepatic fat after 12 weeks of quercetin, while a recent meta-analysis also supports improvements in liver-related markers across multiple trials. [6] [7]

Recommended dosage

There is no official recommended intake for quercetin, but most studies recommend a range between 50 and 150mg/day. [2]
A typical Western diet is estimated to provide 10–20 mg/day. [2]
In a human dose-ranging study, supplementing quercetin intake by 50–150 mg/day for 2 weeks increased circulating quercetin levels by ~178% to ~570%. [2]
Liberty uses 75 mg/day, which sits right in this “top-up” window. It is several times higher than typical dietary intake and is expected to measurably raise circulating quercetin when taken consistently as part of a daily routine. [2]
Higher standalone protocols of 500–1,000 mg/day exist, but only as short-term, targeted doses (of 4-12 weeks). [11]

Safety & interactions

Quercetin is generally well tolerated in human studies, but long-term high-dose use (1000mg<) deserves caution because extended-duration safety data is limited. [16]
Quercetin has potential interaction pathways (including drug transporters and metabolism), so always check with your doctor if you use prescription medication, especially anticoagulants or immunosuppressants. [16]
If you are pregnant or breastfeeding, consult a medical professional before use. [16]

Frequently Asked Questions about quercetin

Why is quercetin so popular on social media?

It trended during the COVID period as part of “immune support” routines and is now heavily discussed for its longevity and cell health support. [13]

Is quercetin better from food or supplements?

As with any supplement, natural food sources are always the better source of quercetin. However, given the small amount of quercetin consumed via the average daily diet, a supplement is an easier and more stable alternative. [1]

Does quercetin improve sleep?

Some trials show improved sleep quality in certain groups, while others show no effect, so it appears context dependent. [9] [10]

Does quercetin help build muscle?

No, quercetin is better viewed as a recovery-support ingredient. The “muscle growth” angle mainly makes sense when it helps you recover and stay consistent with training, especially alongside creatine. [11] [12]

Is quercetin good for heart health?

Meta-analyses suggest it can modestly reduce blood pressure, but it does not replace lifestyle fundamentals or medical care when needed. [5]

Can I take quercetin daily?

Daily use is common in studies, but it is best to stick to label directions and avoid stacking multiple high-dose quercetin products. [12]