Vitamin C Supplements Tested by ConsumerLab.comProduct Reviews
Vitamin C Supplements Review

Find the Best Vitamin C Supplement

20% Of Vitamin C Supplements Fail CL's Tests of Quality

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Brands compared in report

American Health Ester-C
Bronson Laboratories Vitamin C Crystals
CVS Pharmacy C
Dynamic Health Liquid Vitamin C for Kids - Natural Citrus Flavors
Garden of Life Mykind Organics Vitamin C
GNC Vitamin C 1000
Jamieson C
Kirkland Signature (Costco) Vitamin C
Life Extension Vitamin C with Dihydroquercetin
LivOn Laboratories Lypo-Spheric Vitamin C
Metagenics Ultra Potent-C
Nature Made C
Nature's Bounty C
Nature's Bounty C-1000 mg
Nature's Plus Vitamin C
Nutrifii VinaliC Vitamin C
Rainbow Light Gummy Vitamin C Slices
Rexall Vitamin C
Shaklee Vita -C
Spring Valley [Walmart] C
Sundown Naturals Vitamin C
The Vitamin Shoppe Vitamin C 1,000 mg - Capsule
The Vitamin Shoppe Vitamin C 1,000 mg - Softgels
TwinLab C-1000 Caps
Up & Up [Target] Vitamin C
Vitacost Vitamin C
Vitafusion L'il Critters Immune C Plus Zinc & Echinacea
Vitafusion Power C
Vitamin World C-1,000 mg
Well at Walgreens Vitamin C With Natural Rose Hips

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More about this report

Many people take a vitamin C supplement believing it will improve their health or prevent disease. Will it really? Are there downsides? 

And if you take a vitamin C supplement, does the product actually contain what it says? Is it the best product in terms of quality and value?'s tests of popular vitamin C supplements revealed that 20% contained much more vitamin C than listed on their labels — a concern because too much vitamin C can have negative short-term and long-term health effects.

In this report you'll learn about the benefits of vitamin C as an essential nutrient and whether taking it as a supplement helps prevent a cold, gout, or heart disease. You'll also learn that vitamin C may cause problems, including diarrhea, cataracts, and kidney stones. 

Of course, you'll also get's tests and comparisons of vitamin C supplements based on independent, laboratory analyses. You'll find out which products were "Approved" or "Not Approved" and why. You'll also learn which products offer exceptional quality and value - making them CL's Top Picks. Some of these cost as little as 1 or 2 cents per dose! 

You must be a member to get the full test results along with's recommendations and quality ratings. You will get results for 15 vitamin C supplements selected for testing 
by as well as for 16 others which 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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Related questions and answers

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