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Vitamin C, also known as ascorbic acid, is a crucial nutrient for immune function, skin health, and antioxidant defense. With numerous options available, selecting the right supplement ensures you receive its full benefits effectively and safely. This guide helps navigate the key factors to consider when purchasing an ascorbate C vitamin supplement.
ANTIOXIDANT PROTECTION: NOW C-500 Calcium capsules provide a daily dose of vitamin C, which is necessary for the production of collagen and is therefore also important for skin, bone, and joint health.
CALCIUM ASCORBATE-C WITH BIOFLAVONOIDS: This product supplies calcium ascorbate, a buffered form of vitamin C that is bioavailable and non-acidic; it is enhanced with bioflavonoids, which work synergistically with vitamin C.
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
Well-Retained; The Vitamin C metabolites in Ester-C positively impact retention of Vitamin C in cells; This complex yields beneficial antioxidant and immune system support; Includes natural bioflavonoids, acerola berry, and rose hips fruit powder
Unique Formula; Special manufacturing process creates a unique calcium ascorbate metabolite complex; Less acidic, pH neutral Vitamin C for sensitive stomachs; Easy to digest, highly-absorbable
Immune Support & More; Solgar Ester-C Plus 500 mg Vitamin C Vegetable Capsules also contribute to collagen formation for healthy skin and cartilage; Increases iron absorption
Non-GMO, Vegan, Kosher & Gluten Free; Solgar Ester C Vegetable Capsules with 500 mg of Vitamin C are free of: gluten, wheat, dairy, soy, yeast, sugar, sodium, artificial flavor, sweetener, 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
ULTRA POTENT GENTLE FORMULA: Deliver 1500mg of high-potency Vitamin C per serving. Our buffered formula uses Calcium Ascorbate to neutralize acidity, making it the perfect choice for those with sensitive stomachs who can't tolerate regular ascorbic acid.*
NON-ACIDIC & STOMACH FRIENDLY: Experience the benefits of Vitamin C without the digestive discomfort. This non-acidic buffered Vitamin C is designed for maximum absorption and gastrointestinal comfort, supporting your daily wellness routine easily.*
POWERFUL IMMUNE SYSTEM SUPPORT: Boost your body’s natural defenses. Our Vitamin C capsules provide essential antioxidant protection, helping to fight free radicals and supporting healthy collagen production for skin, joints, and overall vitality.*
HIGH ABSORPTION CALCIUM ASCORBATE: Unlike standard tablets, our buffered capsules ensure better bioavailability. Enhanced with Calcium, this formula provides a steady release of Vitamin C to keep your immune system strong throughout the day.*
PURE & VEGAN FRIENDLY: Made with non-GMO ingredients in a GMP-certified facility. Our vegan capsules contain no artificial colors or preservatives. Quality you can trust from Innervis Nutrition for your long-term health goals.*
POWERFUL IMMUNITY BOOSTER: our Sodium Ascorbate is a high absorption, bioavailable form of Vitamin C that serves to fortify your body’s immune system, helping you and your family stay healthy*
BE ACTIVE, STAY ACTIVE: a powerful antioxidant and supports the production of carnitine, collagen, and certain neurotransmitters, vital to supporting optimal energy production, healthy looking skin, tissue repair, and brain health*
MIXES WELL & KID FRIENDLY: mixes easily into smoothies and juice, and its mild taste makes it more tolerable for kids and adults than sour tasting forms of Vitamin C such as ascorbic acid*
EASIER ON THE DIGESTION: unlike other Vitamin C supplements such as ascorbic acid that may lead to heartburn, reflux, and stomach upset, this buffered form goes down easy, even when taken in higher doses*
A TRUSTED SOURCE FOR OVER 43 YEARS: we were founded with the guiding principle that everyone deserves good health, and inspired by the research and recommendations of Linus Pauling, PhD, the world’s first two-time Nobel Laureate and pioneer of Vitamin C...
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
For Sensitive Individuals: Buffered ascorbic acid combines calcium ascorbate, magnesium ascorbate, and potassium ascorbate to create a neutral pH vitamin C*
Lessens Gastric Irritation: This special form of ascorbic acid lessens possible gastric irritation in sensitive individuals*
Antioxidant Support: Vitamin C offers a wide range of support for the human body, and it is an antioxidant and free radical scavenger*
Pure Quality: Our supplements are made with premium ingredients sourced from trusted suppliers and guided by nutritional experts, then manufactured and tested to verify potency and purity
Pure Difference: What we leave out matters, too; Pure Encapsulations products are FREE FROM common allergens, artificial or unnecessary ingredients, and GMOs
Gentle on the Stomach: A non-acidic form of Vitamin C, as Sodium Ascorbate.
Laboratory: This product has been tested for GMO and it is GMO-FREE.
Superior Quality: All Bronson products are tested in our state-of-the-art cGMP registered facility in New York.
Trusted Since 1960: The pioneers of Bronson Vitamins were a group of pharmacists who witnessed the benefits of vitamins and mineral supplementation firsthand with their patients. Bronson Vitamins have been consistently mentioned by top medical...
Well-Retained; The Vitamin C metabolites in Ester-C positively impact retention of Vitamin C in cells; This complex yields beneficial antioxidant and immune system support; Includes natural bioflavonoids, acerola berry, and rose hips fruit powder
Unique Formula; Special manufacturing process creates a unique calcium ascorbate metabolite complex; Less acidic, pH neutral Vitamin C for sensitive stomachs; Easy to digest, highly-absorbable
Immune Support & More; Solgar Ester-C Plus 1000 mg Vitamin C Tablets also contribute to collagen formation for healthy skin and cartilage; Increases iron absorption
Non-GMO, Vegan, Kosher & Gluten Free; Solgar Ester-C Tablets with 1000 mg of Vitamin C are free of: gluten, wheat, dairy, soy, yeast, sugar, sodium, artificial flavor, sweetener, 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
Well Retained; The vitamin C metabolites in Ester-C positively impact retention of vitamin C in cells; This complex yields beneficial antioxidant and immune system support; Includes natural bioflavonoids, acerola berry, and rose hips fruit powder
Unique Formula; Our special manufacturing process creates a unique calcium ascorbate metabolite complex; Less acidic, pH-neutral vitamin C for sensitive stomachs; Easy to digest, highly absorbable
Immune Support & More; Solgar Ester-C Plus 500 mg Vitamin C also contributes to collagen formation for healthy skin and cartilage; Increases iron absorption
Non-GMO, Vegan, Kosher & Gluten Free; These vegetable capsules are free of: gluten, wheat, dairy, soy, yeast, sugar, sodium, artificial flavor, sweetener, 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
Gentle on the Stomach; No other vitamin C gives you what Ester-C does; Solgar Ester-C Plus 1000 mg Vitamin C offers a unique, non-acidic vitamin C that’s gentle on the stomach
Upper Respiratory Support; Every dose offers immune support and supports upper respiratory health; What’s more, Ester-C is clinically studied to stay in your white blood cells for up to 24 hours
Highly Absorbable; Our special manufacturing process creates a unique calcium ascorbate metabolite complex; Less acidic, pH-neutral vitamin C for sensitive stomachs; Easy to digest, highly absorbable
Non-GMO & Gluten Free; These tablets are free of: gluten, wheat, dairy, soy, yeast, sugar, sodium, artificial flavor, sweetener 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
Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Ascorbate C Vitamin Supplements
Form of Vitamin C
Ascorbic acid is the most common form, but other buffered or esterified forms may be gentler on the stomach for some individuals. Look for supplements that clearly state the form of vitamin C used, such as calcium ascorbate or sodium ascorbate, if you have a sensitive digestive system.
Dosage and Potency
Vitamin C dosages can range widely, from 100 mg to over 1000 mg per serving. The recommended daily allowance varies by age and sex, but many supplements offer doses significantly higher for therapeutic purposes. Consider your individual needs and consult a healthcare professional if unsure about the appropriate dosage.
Added Ingredients and Purity
Check the ingredient list for fillers, artificial colors, or allergens like soy or gluten, especially if you have dietary restrictions. Opt for products that are third-party tested for purity and potency, indicated by certifications from organizations like USP or NSF. This verification ensures the supplement contains what it claims and is free from contaminants.
Bioavailability and Absorption
Some formulations are designed to enhance absorption. Liposomal vitamin C, for example, encapsulates the vitamin in lipid spheres to potentially improve uptake. While not always necessary, these advanced forms might be beneficial for individuals with absorption issues or those seeking maximum benefit.
Frequently Asked Questions
What is the difference between ascorbic acid and other forms of Vitamin C?
Ascorbic acid is the pure, most acidic form. Other forms, like calcium ascorbate or magnesium ascorbate, are buffered and less acidic, which can be gentler on the stomach for sensitive individuals.
How much Vitamin C should I take daily?
The Recommended Dietary Allowance (RDA) for adults is typically around 75-90 mg per day. However, many supplements offer higher doses for specific health goals; consult with a healthcare provider to determine your personal needs.
Are there any side effects of taking high doses of Vitamin C?
High doses can sometimes cause digestive upset, such as diarrhea or nausea. It's generally recommended to start with a lower dose and gradually increase it, and to stay within recommended upper intake levels.
What does 'third-party tested' mean for supplements?
Third-party testing means an independent laboratory has verified the product's purity, potency, and ingredient accuracy. This ensures the supplement meets label claims and is free from harmful contaminants.
Can I get enough Vitamin C from diet alone?
It is possible to meet your Vitamin C needs through a balanced diet rich in fruits and vegetables like citrus, berries, and bell peppers. However, supplements can be a convenient way to ensure adequate intake, especially if dietary intake is insufficient.
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