Quercetin Supplements

What quercetin is

Quercetin is a flavonoid — a natural plant pigment and antioxidant found in foods like apples, onions, berries, and leafy greens. Because getting a concentrated amount from food alone is hard, people take it as a supplement for everyday antioxidant and immune support. It's one of the most widely used plant compounds in the supplement world.

Quercetin and histamine

Quercetin is well studied for its role in the body's natural histamine response, which is the main reason it's so popular during allergy season — it's the supplement many people reach for when pollen counts climb. The research is ongoing and results vary from person to person, so it's best thought of as something people choose seasonally rather than a guaranteed fix.

Quercetin with bromelain or vitamin C

Quercetin is often paired with other ingredients. Bromelain — an enzyme from pineapple — is a common partner, thought to aid quercetin's absorption. Others combine it with vitamin C in immune-focused blends. You'll find both single-ingredient quercetin and these combination formulas here.

Forms and doses

Quercetin comes as capsules and tablets, plus liposomal liquids (wrapped in a fat layer to aid absorption). Common doses range from about 250 mg to 1000 mg per serving. Some people take it year-round for general antioxidant support, others seasonally — the format and dose follow how you plan to use it.

Quercetin in Canada

Quercetin supplements sold in Canada carry a Natural Product Number (NPN) from Health Canada and ship from our Ontario warehouse to addresses across Canada.

Safety and side effects

Quercetin is generally well tolerated. Some people may notice mild side effects such as headache or digestive discomfort, particularly at higher doses. Follow the dose on the label, and check with a healthcare provider before use if you're pregnant, breastfeeding, or taking medication.