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Vitamin C and bioflavonoid complex supplements offer a synergistic approach to supporting immune function and overall well-being. Understanding the key factors to consider when selecting a product can help you make an informed choice for your health needs.
Does this help with vitamin C absorption? Yes — Swanson Citrus Bioflavonoids Complex contains compounds known as bioflavonoids, which aid the absorption of vitamin C for enhanced immune benefits.*
Does this support the immune system? Yes — this dietary supplement offers powerful antioxidant support and aids vitamin C absorption to encourage immune health.*
How potent is this formula? Each capsule delivers a standardized 50% bioflavonoid content for consistent quality and effectiveness in every serving.*
What ingredients are included? Our supplement includes bioflavonoids from bitter orange, along with rose hips extract and acerola cherry for a comprehensive formula.
Can I trust the quality of this supplement? Swanson is a name you can rely on — our products are manufactured to the highest standards, ensuring you get trusted quality, every time.
ANTIOXIDANT PROTECTION*: A highly effective antioxidant that can help maintain healthy tissues by neutralizing free radicals generated during normal metabolism and exposure to environmental stressors*
VEGAN TABLETS/WITH 250 MG BIOFLAVONOIDS: Supplies calcium ascorbate, a buffered form of vitamin C that is bioavailable and non-acidic, and enhanced with bioflavonoids, which work synergistically with vitamin C*
CERTIFICATIONS/CLASSIFICATIONS: Soy Free, Non-GMO, Vegan/Vegetarian, Nut Free, Made without Gluten, Dairy Free, Egg Free, Kosher
GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product...
Founded in 1968 by Elwood Richard, NOW is one of the largest independent, family- and employee-owned manufacturers of natural products
ANTIOXIDANT PROTECTION*: A highly effective antioxidant that can help maintain healthy tissues by neutralizing free radicals generated during normal metabolism and exposure to environmental stressors.*
VEGAN TABLETS/WITH 250 MG BIOFLAVONOIDS: Supplies calcium ascorbate, a buffered form of vitamin C that is bioavailable and non-acidic, and enhanced with bioflavonoids, which work synergistically with vitamin C.*
CERTIFICATIONS/CLASSIFICATIONS: Soy Free, Non-GMO, Vegan/Vegetarian, Nut Free, Made without Gluten, Dairy Free, Egg Free, Kosher, Low Sodium
GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation).
Packaged in the USA by a family owned and operated company since 1968.
SUPPORTS HEALTHY IMMUNE FUNCTION - Assists and supports the body in healing responses to the wear and tear our bodies are constantly under.
OPTIMAL ANTIOXIDANT LEVELS - Containing 300 mg of citrus bioflavonoids, which enhance the action of Vitamin C
SUPPORTS VASCULAR HEALTH - 50 mg of Rose Hips that support optimal blood circulation.
PROMOTES HEALTHY SKIN - Acerola & Rutin powder are powerful bioflavonoids that are antioxidant-rich.
SUPERIOR ABSORPTION & BIOAVAILABILITY - Our Bioflavonoid C Complex formula contains 1000 mg of vitamin C as mineral ascorbates, which provides a buffered, easily assimilated form for the body to absorb.
Immune System Boost – Vitamin C has powerful antioxidant properties that support the immune system function. Our Vitamin C-1000 Complex is formulated with naturally occurring bioflavonoids that enhance the effect and provide a sustained release of...
Powerful Blend Of Natural Ingredients - NutriONN Vitamin C-1000 Complex contains 1000 mg Vitamin C, 530 mg Citrus Bioflavonoids with added Rutin, Acerola, Hesperidin, Quercetin and Rose Hips, which provide the perfect combination for an all-round immunity...
Enhanced Absorption - We have specially added a high amount of bioflavonoids to our Vitamin C-1000 Complex to increase the absorption of Vitamin C. Bioflavonoids and Vitamin C work in synergy to provide a targeted support for the immune system, brain and...
Why Choose NutriONN - As a small company, we value our clients and our open and honest approach has kept them coming back since 2013. We make sure to choose our ingredients carefully to provide you with high quality products.
100% Money Back Promise – If there is anything you don’t like about our product we will give you a 100% refund. No questions asked. At NutriONN our number one priority is to make sure our customers are happy and healthy.
Immune Support: Vitamin C formulated with natural citrus bioflavonoids for added antioxidant benefits resulting in better cellular protection against free radicals within the body*
Healthy Skin: Promotes collagen production, which enhances skin, nail, and hair health and supports healthy tissue and cartilage formation*
Detox Support: Promotes the body's natural ability to eliminate toxins and benefits liver health by helping increase glutathione and other potent antioxidants*
Third-Party Certified: This product has been third-party tested and certified to verify what's in the package matches what's on the label and to confirm it contains no unsafe levels of contaminants
Trusted: Thorne is trusted by 100+ professional sports teams and the #1 most recommended clinical brand by consumers and health-care practitioners (Based on a 2026 independent survey of US supplement consumers and health-care practitioners)
Antioxidant; Quercetin is found in onions and other foods; It possesses antioxidant properties, which help to fight free radicals
Immune Health Support; Solgar Quercetin Complex includes the important bioflavonoid Quercetin in a synergistic formula with Ester-C Plus to provide immune health support
Gentle On The Stomach; Ester-C Plus provides a unique, pH neutral (non-acidic), form of vitamin C that is gentle on the stomach; Ester-C Plus offers the additional benefits of incorporating acerola berry, citrus bioflavonoids, rutin and rose hips
Non-GMO, Gluten, Wheat & Dairy Free; Solgar Quercetin Complex is suitable for vegans and free of: gluten, wheat, dairy, soy, yeast, sugar, sodium, artificial flavor, sweetener, preservatives, and color
The Gold Standard: For over 70 years, Solgar has been committed to quality, health, and well-being. Our mission is to create the finest nutritional supplements in small batches, through tireless research, using only the finest raw materials
Vitamin C 1000mg Capsules; Our advanced formula vitamin C complex contains 1,000 mg of high potency vitamin C plus zinc, rose hips and bioflavonoids and supports a healthy immune system, production of cellular energy and collagen production
Free radical defense; BioSchwartz advanced formula vitamin C complex utilizes citrus Bioflavonoids and Rose Hips, both rich sources of vitamin C, to give your body an antioxidant boost and protect against free radicals while supporting immune cells to...
Essential for optimal health; BioSchwartz advanced formula vitamin C complex has the fighting power of 10 oranges packed with antioxidant rich vitamin C, which is essential for muscle health, tissue repair, heart health and more
Purity tested and allergen free; Each and every batch of BioSchwartz advanced formula vitamin C complex are third party tested to guarantee purity, potency, and quality. This formula has been manufactured without GMOS, soy, gluten, milk, egg, wheat...
The BioSchwartz Quality Difference; Our professional grade vitamin C complex supplement is made in the USA with the finest quality globally sourced ingredients, following strict cGMP guidelines to ensure the greatest benefits are achieved
Tri-Complex – A hardworking antioxidants supplement, Nature's Life Lemon Bioflavonoids provide 1000mg of citrus bioflavonoids and 100mg each of Hesperidin and Rutin – the perfect trifecta for antioxidant support.
Flavonoids to the Rescue – Polyphenols naturally found in lemons and other citrus fruits, bioflavonoids support cellular health by helping to neutralize free radicals and may help the body absorb and utilize all-important Vitamin C.
GMP Certified – GMP stands for Good Manufacturing Practice, and it ensures that all the products we make – including our bioflavonoids supplements – follow stringent quality standards. We even document each step of the manufacturing process.
Our Policy is Quality – All supplements are not created equal and “less than” will not stand at Nature’s Life. We craft and source our products with exceptional care, turn away 90% of new raw ingredients and triple-test every product to ensure...
Love Your Mother Earth – Our products help fill nutritional gaps without taking away from the earth – and we put our money where our mouth is. We’re members of 1% for the Planet, meaning that we donate 1% of our annual sales to go towards...
Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Vitamin C & Bioflavonoid Complex Supplements
Understanding Vitamin C Forms
Vitamin C, or ascorbic acid, comes in various forms. Buffered forms, like calcium ascorbate or sodium ascorbate, are often gentler on the stomach for individuals sensitive to acidic supplements. Esterified vitamin C (e.g., Ester-C®) is another popular option, designed for enhanced absorption and sustained release.
The Role of Bioflavonoids
Bioflavonoids, also known as flavonoids, are plant-derived compounds that work synergistically with vitamin C. They are believed to enhance the absorption and utilization of vitamin C in the body and possess their own antioxidant properties. Look for supplements that clearly list the types and amounts of bioflavonoids included, such as hesperidin, quercetin, rutin, and citrus bioflavonoid complex.
Dosage and Potency
The optimal dosage of vitamin C can vary, but many supplements range from 500 mg to 1000 mg per serving. Consider your individual dietary intake and health goals when determining the right potency. It's also important to check the bioflavonoid content, as this can vary significantly between products. Always follow the recommended serving size on the product label.
Ingredient Quality and Sourcing
Prioritize supplements made with high-quality ingredients. Look for products that are:
Free from artificial colors, flavors, and preservatives.
Made in facilities that adhere to Good Manufacturing Practices (GMP).
Third-party tested for purity and potency by independent laboratories.
Understanding the source of the ingredients can also be beneficial, with many preferring natural or plant-derived sources.
Comparison Tips
Form of Vitamin C: Choose a form that suits your digestive system.
Bioflavonoid Inclusion: Ensure the supplement contains a diverse range of bioflavonoids.
Potency: Match the dosage to your personal needs and dietary habits.
Third-Party Certifications: Look for seals of approval from reputable testing organizations.
Absence of Fillers: Opt for minimal ingredients to avoid unnecessary additives.
Frequently Asked Questions
What are bioflavonoids and why are they important in supplements?
Bioflavonoids are natural compounds found in fruits and vegetables that work alongside vitamin C. They are thought to boost vitamin C's effectiveness and provide their own antioxidant benefits.
Are there different forms of Vitamin C available in supplements?
Yes, Vitamin C comes in various forms. Buffered options like calcium ascorbate are gentler on the stomach, while esterified forms are designed for better absorption.
How much Vitamin C should I take daily?
The ideal daily intake varies based on individual needs and diet. Many supplements offer between 500 mg and 1000 mg, but it's best to consult with a healthcare professional for personalized advice.
Can I take Vitamin C and bioflavonoid supplements with other medications?
It's always recommended to consult your doctor or a pharmacist before combining any new supplements with existing medications. They can advise on potential interactions.
What does 'third-party tested' mean for supplements?
Third-party testing means an independent laboratory has verified the supplement's purity, potency, and ingredient accuracy. This ensures the product meets its label claims.
Are Vitamin C and bioflavonoid supplements suitable for vegetarians or vegans?
Many Vitamin C and bioflavonoid supplements are suitable for vegetarians and vegans, but it's important to check the product label for specific certifications or ingredient sourcing.
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