Quercetin

Quercetin is a powerful flavonoid antioxidant found in many fruits, vegetables, and herbs, particularly in onions, apples, and berries. It is known for its strong anti-inflammatory, antiviral, and immune-supportive properties, making it a popular supplement for respiratory health, allergy relief, and general immune balance.

Quercetin is especially beneficial for people dealing with seasonal allergies, histamine intolerance, or those seeking to reduce oxidative stress. It helps stabilize mast cells, reducing the release of histamine, and may also support healthy blood pressure and vascular function.

For best absorption, it is often paired with bromelain (an enzyme from pineapple) or taken in liposomal form. Quercetin is best taken with meals containing healthy fats to enhance bioavailability. Divided doses (e.g., 250–500 mg twice daily) are commonly used during allergy seasons or times of immune stress.