Best Lemon Flavonoid Vitamin Supplements in 2026

BALANCED IMMUNE SYSTEM: Quercetin is a naturally occurring free radical scavenger that supports healthy seasonal immune system function. Laboratory studies have demonstrated that quercetin can also help to promote normal respiratory function.

WITH BROMELAIN: Bromelain has a long history of use by herbalists and is known to help support a balanced immune system response to environmental challenges.

CLASSIFICATIONS/CERTIFICATIONS: Kosher, non-GMO, soy free, vegan/vegetarian, nut free, made without gluten, dairy free, egg free

MAX STRENGTH QUERCETIN: aSquared Nutrition’s maximum strength Quercetin formula contains 500mg of Quercetin powder per capsule and 200 vegetable capsules per bottle for a full 200-day supply. Quercetin is a plant pigment flavonoid that is naturally found in berries, broccoli, and leafy greens. Quercetin is a powerful antioxidant and free radical scavenger that helps protect the body from cell membrane damage & DNA alterations. *

FEEL THE DIFFERENCE: Quercetin is a powerful antioxidant. Quercetin supplementation may support immune and skin health, and cardiovascular health. Additionally, Quercetin helps fight allergies, supports circulation, supports mood & energy levels, and may help protect your kidneys, brain & liver. *

POWERFUL ANTIOXIDANT: Flavonoids such as Quercetin are free radical scavengers that fight off oxidation. Diets high in Quercetin may help combat cognitive impair & allergies. *

Quercetin the most abundant dietary flavonoid plant pigment naturally found in fruits and vegetables

Supports cardiovascular health

60 servings per bottle

FIGHT OXIDATIVE STRESS – Vitamin C helps fight oxidizing free radicals, which is good for you from your head to your toes. Quercetin does too—the only problem is absorption.Our quercetin is wrapped in a phytosome, which makes it 50 times more bioavailable than traditional quercetin.

Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product delivery

ENCOURAGE HEALTHY IMMUNE FUNCTION - Quercetin and vitamin C both promote immune health: in a randomized clinical trial, quercetin encouraged a healthy immune response in physically fit older adults—and we all know how much immune challenges want a taste of 1000 mg of vitamin C.

Supports Antioxidant Status: Quercetin is a phenolic antioxidant found in green leafy vegetables, onions, apples and cherries.

Cardiovascular Health: Quercetin supports cardiovascular health by supporting blood vessel endothelial cellular integrity and function.

Immune Health: Quercetin has been shown to be one of the most bioactive flavonoids that supports a healthy immune system response.

𝟮𝗫 𝗠𝗢𝗥𝗘 𝗘𝗙𝗙𝗘𝗖𝗧𝗜𝗩𝗘 𝗜𝗠𝗠𝗨𝗡𝗘 𝗦𝗨𝗣𝗣𝗢𝗥𝗧: Our quercetin-bromelain supplement contains 500mg NATURAL QUERCETIN, providing 2x more powerful immune support than other supplements’ 250mg of synthetic quercetin. Plus, we blend in 5 ADDED NUTRIENTS FOR BROAD-SPECTRUM SUPPORT.

𝗣𝗢𝗧𝗘𝗡𝗧 𝗭𝗜𝗡𝗖 𝗙𝗢𝗥𝗠: Our synergistic Z-Pass complex combines 50mg zinc with quercetin 500mg. Quercetin helps zinc pass through lipid membranes for INCREASED ABSORPTION. Our quercetin with zinc citrate is 23% MORE BIOAVAILABLE than zinc sulfate: its OPTIMAL DOSAGE is 5x more potent than 10mg formulas.

𝟯𝗫 𝗕𝗘𝗧𝗧𝗘𝗥 𝗤𝗨𝗘𝗥𝗖𝗘𝗧𝗜𝗡 𝗔𝗕𝗦𝗢𝗥𝗣𝗧𝗜𝗢𝗡: On its own, quercetin isn’t easily absorbed. To combat this, we combine quercetin with 500mg of the PUREST VITAMIN C FORM (ascorbic acid) and natural bromelain (from pineapple). Together, these nutrients BOOST UPTAKE of QUERCETIN’S POLYPHENOL and FLAVONOID COMPOUNDS.

THE HEALTH BENEFITS OF RED GRAPES, ONIONS & APPLES – Quercetin is a flavonoid found in red grape skins, red onions, apples and other food sources. It supports healthy cellular function, cardiovascular health and encourages a healthy immune response, especially to seasonal challenges

EXTRA IMMUNE SUPPORT - While quercetin is known for immune health benefits, it comes with a supporting cast in our formula. Our Optimized Quercetin is augmented with vitamin C and camu-camu extract for additional immune support

QUERCETIN & YOUR HEART - Quercetin promotes cardiovascular health by protecting the integrity of your vascular endothelium. It also supports already-healthy cholesterol levels

600mg Quercetin + 600mg Nettles - Two plant extracts that have been shown to support the immune system and the body’s natural inflammatory response upon exposure to environmental challenges.*

Quercetin is a flavonoid found in many foods that works to promote a healthy inflammatory response.*

Nettles have a high vitamin C content underlying its immune-supportive and antioxidant properties that may also benefit a normal inflammatory response.*

PREMIUM IMMUNE SUPPORT: Our organic elderberry gummies combines the health benefits of Black Elderberry Extract, Echinacea Extract, which can better strengthen body's natural defenses, boost immunity. These organic elderberry syrup are rich in antioxidants and high potency, which can provide you and your family with the protection you need.

STRENGTHEN ANTI-OXIDATION: One study has proved that organic black elderberry boosted anti-oxidation ​is three times faster than a regular herbal supplement. For optimal protection all year-round, you can chew 1- 2 sambucus elderberry gummies vitamins per day to help our body remain balanced and defend naturally.

MOST VALUABLE BIOACTIVES: EnvyCure vegan elderberry gummies are made from the European black elderberry extract to ensure you can get a higher content and all-natural flavonoids, which are the most valuable antioxidants and phytochemicals in elderberry. Each serving elderberry gummies contains 150mg of elderberry extract, which is standardized to 25% anthocyanin (potent flavonoid BioActives) to ensure you get better immunity compared with other elderberry supplements.

✅ Quercetin Phytosome is better than Quercetin with Bromelain. Forget about Ultra Pure Quercetin, or Premium Quercetin Dihydrate. These are just fancy names for supplements that don’t get absorbed. While other Quercetin supplements get poorly digested, our Quercetin Phytosome is absorbed by more than 20-fold compared to other brands. The most bioavailable form of Quercetin complex on the market

✅ Enhanced with a patented Vitamin C supplement that supports immune health and enter cells safely, quickly, and more effectively with absorption rates of more than 200% the retention rates of other Vitamin C capsules in the market

✅ Get the recommended daily intake of Zinc with a patented formula with superior bioavailability to support immune function, metabolism and health maintenance. It is especially helpful for people on their golden years where the zinc absorption decreases

Sambucus elderberry gummies are made from European black elder (Sambucus nigra L.) has been traditionally used as a winter remedy for immune support.* Made with our unique, full spectrum black elderberry extract, ensuring Flavonoid BioActives content, which has been tested and shown to be active within the body.

Elderberry gummies are made from a unique cultivar of black elderberries with a higher level of naturally-occurring flavonoids; each serving delivers 50 mg of black elderberry extract, with vitamin C and Zinc.

Black elderberry extract is standardized to BioActives (flavonoids).

【Benifit of ECHINACEA】Echinacea, also known as purple coneflower, which is a very popular herb for centuries, people commonly take it as immune system booster. It can improve digestive & immune system health.

【Powerful Antioxidants 】Our organic echinacea & elderberry gummies is loaded with high concentration of Flavonoid which are potent BioActives to promote your immune defenses, maintain healthy digestive system. Added with the Vitamin C & Zinc as aid to help stimulate activity of immune system cell and improve skin health and chronic fatigue.

【100% Natural Supplement】The organic echinacea gummies for kids & adults are free of GMOs, preservatives, artificial colors, soy, eggs, nuts, gluten, gelatin. These are vegetarian and low sugar echinacea gummies, only uses all-natural ingredients.

Tri-Complex: One tablet contains 1000 milligrams lemon bioflavonoid and 100 ea. hesperidin and rutin

Antioxidant Support: Powerful free radical scavengers may help protect cells

More Bioflavonoid Benefits: Helps support vitamin C absorption and healthy blood flow

Breathe easy with year-round defense for your seasonal allergies; Formulated with a fast-acting, highly bioavailable form of quercetin that’s easy to absorb

Support your immune system with this potent antioxidant; Protects against oxidative stress and free radicals; Enhances the efficacy of other nutrients like zinc and vitamin C

Supports a healthy inflammatory response as well as sinus and upper respiratory health; Also includes 50mg of vitamin C per serving for a boost in antioxidant protection

FUEL YOUR INNER ATHLETE - Muscle cells naturally contain high levels of carnosine. It’s a compound (made up of two amino acids) that acts as an antioxidant and a pH buffer, protecting your muscle cells from oxidative stress during AND after exercise. But as we age, ideal carnosine levels begin to decline. Adding carnosine to your daily routine may help protect your cells against oxidative stress

GLYCATION BE GONE - Carnosine helps inhibit glycation, a process by which excess sugar molecules bind to a protein or fat molecule. Over time, glycation affects your body’s essential proteins, and it can contribute to a variety of age-related factors, like wrinkled skin

MULTI-NUTRIENT BLEND - Are you ready to get maximum carnosine benefits? Our formula delivers 500 mg of carnosine, but we didn’t stop there. We added luteolin, a flavonoid found in fruits and veggies that helps safeguard DNA health. And to complement carnosine’s potent antioxidant properties, we added vitamin B1 (thiamine) and benfotiamine. Get the most out of this muscle-friendly nutrient—all in easy-to-swallow capsules

A POWERFUL COMBINATION TO BOOST THE IMMUNE SYSTEM. *Quercetin is a plant pigment naturally found in fruits and vegetables.* Our Gflow Quercetin has Bromelain, vitamin C, Zinc, and Vitamin D3, as well as stinging nettle that also contains high vitamin C and they work together which may help the body absorb the quercetin more effectively.

THE KEY BENEFITS: Quercetin with Bromelain supports healthy aging, helps to reduce the damage and irritation caused by free radicals, helps promote a normal respiratory function, helps to fuel the immune system, helps enhance the absorption of zinc.*

Quercetin helps to lower the release of histamines, a compound that is released by cells in response to allergic.*It is one of the most abundant antioxidants in the diet and plays an important role in helping your body combat free radical damage.*Quercetin 500 mg is offered in a vegetarian capsule to suit most diet preferences, promoting general health and well-being.*

Powerful Flavonoid & Antioxidant Powder - Unflavored quercetin supplement, just add to water. 100 Servings per container.

500mg Quercetin - Quercetin is one of several flavonoids that have effects on mast cells and basophils.*

Histamine Support - Vitamin C helps promote normal histamine responses.*

APPLE POLYPHENOLS EXTRACT - Safe product with no side effect, this supplement belongs to the flavonoids family providing antioxidant benefits, with quercetin, anthocyanins, catechins and kaempferol.

ANTIOXIDANT - In recent studies, polyphenols from apples extended lifespan by up to 12% by stimulating antioxidant defenses. It slows down aging, balances glucose and lipids levels, and supports skin health.*

NON-GMO, GLUTEN FREE, VEGETARIAN FRIENDLY - Supersmart offers you an outstanding quality and choice of supplements for women and men, difficult to find elsewhere.

Each softgel contains 666.66 mg Green Propolis from pure Propolis Extract

Fully licensed with GMP, and SGC HACCP

Manufactured by unpolluted tropical forest material in Brazil

Orange flavor with a sour finish tailored for sour candy lovers

Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product delivery

Soft pectin-based vegetarian gummy, Supports Healthy Immune System*

Biotrex nutraceutical is premium and a trusted brand is driven by quality, consistency and science. Each product is scientifically formulated through intensive research. Quercetin 100mg is an advanced quercetin 100mg that provides a maximum dose per unit of veg capsules for health.

Improves Health: Quercetin may help reduce blood pressure levels. The compound appeared to have a relaxing effect on blood vessels. Quercetin in supplement form daily reduced systolic and diastolic blood pressure fights allergies, lowers inflammation, potentially improves endurance.

This is a vegetarian product: All the vitamin supplements produced in the Biotrex Nutraceuticals is made out of natural ingredients which make all the capsules 100% vegetarian, vegan-friendly, gluten-free, Non-GMO, GMP and ISO 22000 certified.

IMMUNITY SUPERSTAR! IMMUNO by PureHealth Research is jam-packed with core natural nutrients to help support healthy immune functions at the cellular level.

BURSTING WITH NUTRIENTS – FEEL LIKE A MILLION BUCKS! Living in this toxin-filled world can overwhelm your immunity and make you feel sluggish and foggy.

Relive Memorable Moments — Your friends and family appreciate when you remember their favorite meal, hobby or holiday. Gamma-aminobutyric acid (GABA) can help promote a calm, relaxed state of mind. Easily recall your niece’s favorite animated character with these memory enhancer supplements for adults

QUERCETIN WITH BROMELAIN: Our powerful Quercetin with Bromelain complex helps support a healthy immune system and respiratory health. Each capsule provides 500mg of Quercetin and 100mg of Bromelain. We recommend two easy to swallow Quercetin Capsules per day to provide you with a powerful dose of Quercetin Dihydrate and Bromelain. Feel the benefits of our Quercetin & Bromelain Supplement today!

IMMUNE SYSTEM & SEASONAL SUPPORT: No matter the season, our Quercetin & Bromelain blend is a powerful formula to help support a healthy immune system and seasonal wellness. With 1000mg of Quercetin (as quercetin dihydrate) and 200mg of Bromelain per serving, you’re getting a powerful Bromelain Quercetin Supplement to support your health.

SUPPORTS IMMUNE & RESPIRATORY HEALTH: Do seasonal challenges have you feeling down? Or are you looking to support a healthy immune system? Quercetin is a natural flavonoid with antioxidant properties and Bromelain is an powerful digestive enzyme. Our high quality Bromelain with Quercetin complex helps support immune system in a vegetarian capsule without harmful fillers.