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Vitamin C Supplements Tested by


  • Does vitamin C help?

    If you get sufficient vitamin C from your diet (such as from a cup of tomato or orange juice), taking more from a supplement will generally not help. Nevertheless, taking high-dose vitamin C daily from a supplement during cold season can slightly reduce the risk of getting a cold, particularly if you are deficient in vitamin C, but won't help once you're sick. Vitamin C supplementation may also slightly reduce blood pressure, although it has not been shown to reduce rates of cardiovascular disease. Taking vitamin C has also been associated with a reduced risk of gout (See What It Does).
  • How much vitamin C to take?

    To be sure you're getting the daily requirement of vitamin C, a supplement providing roughly 50 mg to 100 mg of vitamin C is sufficient for most adults and is quite safe (see What to Consider When Using). When higher doses are taken in hopes of reducing the risk of a cold or gout, or to slightly reduce blood pressure, a typical dose is 500 mg taken twice daily or up to 2,000 mg per day. Be aware, however, that taking more than 500 mg of vitamin C per day on a regular basis (which will saturate your blood with vitamin C) may increase your risk of developing cataracts, and taking more than 1,000 mg per day may also increase your risk of kidney stones. In fact, while adequate levels of vitamin C in the body are associated with reduced risk of death, this appears to reverse at higher levels. Diarrhea can result from a single dose of more than 2,000 mg for an adult and lower amounts for children (see Concerns and Cautions). In short, there is a risk/benefit trade-off when taking high-dose vitamin C.
  • Which form of vitamin C is best?

    There are many forms of vitamin C available (ascorbic acid, sodium ascorbate, calcium ascorbate, liposomal vitamin C, etc.) but there is no compelling evidence that one is much better than another. The ascorbate forms may be easier on your stomach, but you will still run a risk of developing loose stools at a very high dose. Whole food ingredients (like lemon peel) will provide additional bioflavonoid compounds, which may be of some benefit, but are not necessary to meet your nutritional needs, and natural vitamin C, such as from rose hips, is the exact, same compound, L-ascorbic acid, found in most synthetic vitamin C supplements. As vitamin C is an acid, products formulated as capsules or tablets may be safer for your teeth than high-dose liquids, powders (mixed into liquids), chewables, or gummies. (See Forms of Vitamin C).
  • Which vitamin C supplement is best?

    Among the products that contained their listed amounts of vitamin C and were "Approved" in testing by, four were chosen as CL's Top Picks for different uses, including one that provides the daily requirement of vitamin C for less than a penny.

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Vitamin C supplements compared in this review

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American Health Ester-C

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ChildLife Liquid Vitamin C

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Dr. Mercola Liposomal Vitamin C

View Larger Image 7235_large_EmergenC-SuperOrange-VitaminC-2020.png

Emergen-C 1,000 mg Vitamin C - Super Orange

View Larger Image 7201_large_EsterC-VitaminC-2020.png

Ester-C 500 mg

View Larger Image 7190_large_GardenOfLife-Spray-VitaminC-2020.png

Garden of Life mykind Organics Vitamin C - Organic Spray - Orange-Tangerine

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Garden of Life Vitamin Code RAW Vitamin C

View Larger Image 7199_large_Jamieson-VitaminC-2020.png

Jamieson Chewable C 500

View Larger Image 7193_large_Life-Extension-VitaminC-2020.png

Life Extension Vitamin C and Bio-Quercetin Phytosome

View Larger Image 7236_large_NatureMade-Gummies-VitaminC-2020.png

Nature Made C Gummies 250 mg

View Larger Image 7200_large_NaturesBounty-VitaminC-2020.png

Nature's Bounty C 500 mg

View Larger Image 7185_large_NaturesPlus-VitaminC-2020.png

Natures Plus Animal Parade Vitamin C - Natural Orange Juice Flavor

View Larger Image 7194_large_NaturesWay-VitaminC-2020.png

Nature's Way Vitamin C With Rose Hips

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Nutrifii Vinali

View Larger Image 7213_large_Rexall-VitaminC-2020.png

Rexall Vitamin C 500 mg

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Signature Care Vitamin C 500 mg

View Larger Image 7188_large_Solaray-VitaminC-2020.png

Solaray Vitamin C Powder 5,000 mg

View Larger Image 7191_large_Solgar-UCubes-VitaminC-2020.png

Solgar U-Cubes Vitamin C Gummies

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Solgar Vitamin C 1,000 mg

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Sundown Vitamin C 500 mg

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Thorne Vitamin C with Flavonoids

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Vitafusion Power C - Natural Orange Flavor

You must be a member to get the full test results along with's recommendations and quality ratings. You will get results for ten vitamin C supplements selected for testing by as well as for twelve others that passed the same testing in CL's voluntary Quality Certification Program. In this comprehensive review of vitamin C supplements you'll learn:
  • Which vitamin C supplements passed testing, and which failed
  • Which high-quality vitamin C supplements are also lowest cost
  • What vitamin C can and cannot do for your health
  • The potential advantages and differences of forms of vitamin C, such as Ester-C, sodium ascorbate, slow-release vitamin C, and liposomal vitamin C
  • The value of additional ingredients, such as bioflavonoids (e.g., quercetin, dihydroquercetin, rutin, and hesperidin)
  • The dosage of vitamin C used for different purposes
  • The potential side-effects of vitamin C and its interactions with drugs and diagnostic tests

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Additional Information
Tested through CL's Quality Certification Program prior to, or after initial posting of this Product Review.