Initially Posted: 06/06/2020 | Last Updated: 10/31/2020
Vitamin C Supplements Tested by ConsumerLab.com

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

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

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Ester-C 500 mg

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

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Garden of Life Vitamin Code RAW Vitamin C

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Jamieson Chewable C 500

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Life Extension Vitamin C and Bio-Quercetin Phytosome

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Nature Made C Gummies 250 mg

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Nature's Bounty C 500 mg

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Natures Plus Animal Parade Vitamin C - Natural Orange Juice Flavor

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Nature's Way Vitamin C With Rose Hips

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Rexall Vitamin C 500 mg

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Signature Care Vitamin C 500 mg

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Solaray Vitamin C Powder 5,000 mg

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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

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Summary

  • 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. 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 product is best? Among the products that contained their listed amounts of vitamin C and were "Approved" in testing by ConsumerLab.com, 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.
You must be a member to get the full test results along with ConsumerLab.com's recommendations and quality ratings. You will get results for ten vitamin C supplements selected for testing by ConsumerLab.com as well as for eleven 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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