Best Flavonoid Supplements for Immune Support of 2026

Clean Nutraceuticals Immune Blend is a comprehensive 18-in-1 immunity complex that comes in a 30-serving bottle, providing a 30 Day Supply to help boost your immune system. The rapid absorption formula ensures quick effectiveness without added sugars. With essential ingredients like vitamin C, vitamin D3, elderberry, and more, this blend offers powerful support all year round. Simplify your supplement routine with just one daily serving packed with antioxidants to aid your wellness journey.

This Zinc Quercetin supplement comes with 120 vegetarian capsules and can provide 60 servings per bottle. It supports immune system health, cardiovascular health, and respiratory health. This supplement belongs to the Zinc Supplements category.

Pure Quercetin Capsules are a flavonoid vitamin supplement designed to support your immune, cellular, and cardiometabolic health. With bioflavonoids, this supplement can help you maintain healthy mast cell function, promote cardiovascular health, and support the health of capillaries by enhancing their strength and integrity. Additionally, Quercetin has been shown to be one of the most bioactive flavonoids, and research suggests it can play a supportive role in cellular, immune, and cardiometabolic health. Pure Encapsulations is committed to quality, using only premium ingredients sourced from trusted suppliers, and their products are free from wheat, eggs, tree nuts & peanuts, gluten, artificial colors, flavors & sweeteners, coatings and shellacs, GMOs, and unnecessary binders, fillers & preservatives.

The Double Wood Quercetin Capsules help support your immune system by using natural plant compounds found in fruits and vegetables. These capsules include 200 mg of bromelain, which helps your body absorb quercetin more effectively, making the supplement work better. Quercetin also acts as a metabolic activator, which means it may support your body's energy use and overall metabolism. In addition, it functions as a powerful antioxidant and helps your immune system by improving zinc absorption. These combined benefits make the Double Wood Quercetin Capsules a convenient way to boost your immune health and metabolic support daily.

Naturebell Quercetin 1000mg is a powerful and natural antioxidant nutritional supplement that offers daily immune system health support. It contains activated quercetin that retains a 95% purity level with every serving, and is in the highest bioavailable form known as quercetin dihydrate. It is a natural herbal ingredient that is necessary for both mens and womens health, and provides important active properties like flavonoids to help support immune defense, heart health, sugar glucose maintenance, and overall longevity. Customers have reported positive results in preventing the common cold and flu, and have found relief from congestion, sore throat, cough, body ache, and fatigue.

The Turmeric Curcumin Quercetin with Bromelain & Black Pepper Capsules is a premium supplement designed to promote joint health and comfort, support the immune system, and provide allergy relief. The supplement contains inflammation-balancing properties of turmeric, quercetin, and bromelain, which are ideal for maintaining an active lifestyle. Additionally, the supplement includes bioperine, a black pepper extract, that enhances the absorption of active ingredients in turmeric curcumin supplements, making it easier for you to enjoy the maximum benefits.

Micro Ingredients Immune Support is a comprehensive immunity booster designed for your health needs throughout the year. This formula combines six essential nutrients, including 500mg of quercetin, 500mg of vitamin C, and a zinc complex, to help you stay healthy during seasonal changes. With 240 capsules in each pouch, you can easily take two capsules daily to support your immune system, lung health, and heart health. It’s a convenient option for those looking to enhance their antioxidant intake and overall wellness without worrying about allergens, as it is free from soy, dairy, gluten, and preservatives.

Sandhu's Quercetin 500mg is designed to support your immune and respiratory health throughout the year by providing a potent dose of quercetin dihydrate in each capsule. This supplement offers a highly pure form of quercetin, standardized to 95%, which means you get a stronger and more effective antioxidant compared to many other options. Each serving delivers 1000mg of this bioavailable nutrient, helping you maintain cellular health and ease oxidative stress. Rich in bioflavonoids, this formula supports your immune system naturally, making it a convenient choice for those looking to boost their overall wellness with a trusted supplement.

Jarrow Formulas Quercetin 500 mg is a dietary supplement that supports antioxidant status, cardiovascular health, and immune health. It contains a phenolic antioxidant found in onions, green leafy vegetables, and fruits such as apples and cherries. Quercetin supports cardiovascular health by supporting blood vessel endothelial cellular integrity and function. It has also been shown to be one of the most bioactive flavonoids that supports a healthy immune system response. This supplement comes in veggie capsules, is vegan and vegetarian friendly, and certified non-GMO.

GADE NUTRITION BOOST YOUR HEALTH Quercetin Supplements are a potent combination of Quercetin, Bromelain, Vitamin C, D, and Zinc that work together to boost the immune system, support healthy aging, and promote normal respiratory function. With 1000mg of Quercetin per serving, these supplements are offered in veggie capsules to suit most diet preferences and are made with non-GMO, gluten-free, and vegan ingredients. The capsules are also free of sugar, stimulants, binders, filters, allergens, and chemical or synthetic substitutes. Manufactured in the USA in an FDA-registered laboratory that is GMP certified, these supplements are of high quality and purity.