Quercetin
Quercetin is a plant flavonoid — one of the natural, colourful pigments that give fruits, vegetables and flowers their rich hues. You already eat it every day: it's found in onions, apples, capers, berries, leafy greens and even tea. In supplement form, quercetin lets you concentrate a compound that's otherwise spread thinly across the produce aisle, which is exactly why so many shoppers add it to their cupboard.
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As an antioxidant, quercetin helps protect the body against oxidative stress caused by free radicals, as part of a balanced diet, and provides antioxidants for the maintenance of good health. Antioxidants are the reason quercetin has such staying power on the shelf, and it sits comfortably alongside the other colourful, antioxidant-rich foods on your plate. It's a natural fit for anyone already leaning into a plant-forward diet.
Quercetin has become a familiar name in seasonal-wellness routines, especially when the seasons turn and people pay closer attention to their daily habits. It's often part of a broader routine that includes vitamin C, rest and a colourful diet. Many shoppers reach for it during spring and fall in particular, when they like to give their everyday habits a little extra thought. It's an easy way to lean into those seasonal habits with something you already eat in your food.
You'll frequently see quercetin combined with other ingredients in a single formula. Two of the most common companions are vitamin C — another well-known antioxidant — and bromelain, an enzyme derived from pineapple that's often included to support absorption. Citrus bioflavonoids are another popular pairing, which we cover in the section below. These blends let you cover several complementary ingredients with one purchase.
We stock quercetin as capsules, softgels and liquids, on its own or in combination formulas. When choosing, decide whether you want straight quercetin or a blend, and check the other ingredients so the formula matches your routine. Keep the bottle sealed in a cool, dry place away from light, and keep liquids out of humidity once opened. As with any supplement, speak with your health-care practitioner before adding it to your routine.
Quercetin with Bioflavonoids
Many quercetin products don't stop at quercetin alone — they round it out with citrus bioflavonoids, the plant compounds that occur alongside vitamin C in oranges, lemons and other citrus fruit. Because quercetin is itself a flavonoid, pairing it with a broader bioflavonoid complex is a natural fit, and it's one of the most popular ways shoppers buy it. These combination formulas often add vitamin C as well, giving you several antioxidant ingredients in a single capsule. If you'd rather keep your cupboard simple, a quercetin-with-bioflavonoids blend can replace two or three separate bottles. Check the label to see exactly which bioflavonoids and companion ingredients are included.
Should I choose plain quercetin or a bioflavonoid blend?
It depends on how you like to shop. Plain quercetin keeps things simple and lets you control each ingredient, while a bioflavonoid blend bundles complementary antioxidants — often with vitamin C — into one capsule. Read the label and pick whichever suits your routine.
Frequently asked questions
What foods naturally contain quercetin?
Quercetin is found in onions, apples, capers, berries, leafy greens, broccoli and tea, among others. A colourful, plant-rich diet naturally provides some. Supplements simply offer it in a more concentrated form.
Why is quercetin often paired with vitamin C or bromelain?
These are common companions in quercetin formulas. Vitamin C is another well-known antioxidant, while bromelain — a pineapple-derived enzyme — is frequently added to help with absorption. Blends let you cover several ingredients in one capsule.
When do people usually take quercetin?
Many shoppers keep it in their routine year-round, while others focus on the changing seasons, spring and fall especially. It's often paired with vitamin C and general good habits. The timing is really a matter of personal preference.
What are citrus bioflavonoids?
Bioflavonoids are plant compounds found alongside vitamin C in citrus fruit, and they're a popular addition to quercetin formulas. They round out the antioxidant profile of a blend. See the section below for more.
How should I store quercetin?
Keep it sealed in a cool, dry cupboard away from direct light and heat. Liquids are best kept out of humidity once opened. Check the best-before date on the label.
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