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Quercetin is a plant pigment (flavonoid) commonly found in apples, dark berries and leafy green vegetables. Its natural antihistamine, anti-inflammatory and antioxidant properties make quercetin beneficial for all dogs, but particularly those who suffer from allergies, seasonal itching or need an immune boost.
Quercetin has a low bioavailability on its own — combining it with vitamin C, digestive enzymes like bromelain, or opting for liposomal quercetin, can improve absorption in your pet's body.