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Vitamin C · 9 products

What vitamin C really costs, and how much of its testing you can see.

Every price is converted to cost per 500 mg of vitamin C, using the vitamin C line on the Supplement Facts panel (not the weight of the whole compound). Each product shows its form, such as ascorbic acid or a buffered ascorbate. Testing transparency gets its own grade, A to C, and is never blended into the price.

What the research says about vitamin C →

Tier
Form
ProductCost per 500 mgBest priceTierTesting
NOW FoodsC-1000 With Rose Hips TabletsTablets · Ascorbic acid · with rose hipsNot yet reviewed
$0.046Vitacost$9.17 / 100 servingsChecked Oct 22, 2026CNo current certificationNo COA found
Nature MadeVitamin C 1,000 mg TabletsTablets · Ascorbic acidNot yet reviewed
$0.050Vitacost$10.00 / 100 servingsChecked Oct 22, 2026CNo current certificationNo COA found
Nature's BountyVitamin C 1,000 mgTablets · Ascorbic acidNot yet reviewed
$0.058Vitacost$11.50 / 100 servingsChecked Oct 22, 2026CNo current certificationNo COA found
Nature's BountyVitamin C 500 mg TabletsTablets · Ascorbic acidNot yet reviewed
$0.067Vitacost$6.69 / 100 servingsChecked Oct 22, 2026CNo current certificationNo COA found
NOW FoodsBuffered C-1000 Complex TabletsTablets · Calcium ascorbate · with citrus bioflavonoids, acerola, rutinNot yet reviewed
$0.068Vitacost$12.24 / 90 servingsChecked Oct 22, 2026CNo current certificationNo COA found
SolgarEster-C Plus Vitamin C 1,000 mgTablets · Calcium ascorbate · with Ester-C, citrus bioflavonoid complex, acerola extract, rose hips, rutinNot yet reviewed
$0.078Vitacost$28.19 / 180 servingsChecked Oct 22, 2026CNo current certificationNo COA found
ThorneVitamin C with FlavonoidsCapsules · Ascorbic acid · with citrus bioflavonoidsNot yet reviewed
$0.26Thorne$23.00 / 90 servingsChecked Oct 22, 2026CNo current certificationNo COA found
Emergen-CVitamin C Super Orange 1,000 mg PacketsPowder · Other · + 2 mg zincNot yet reviewed
$0.26Vitacost$15.43 / 30 servingsChecked Oct 22, 2026CNo current certificationNo COA found
Garden of LifeVitamin Code RAW Vitamin CCapsules · Other · with raw organic fruit and vegetable blend, raw probiotic and enzyme blendNot yet reviewed
$0.44Vitacost$26.59 / 60 servingsChecked Oct 22, 2026CNo current certificationNo COA found

What the tiers mean

A
A current third-party certification and a COA from an ISO/IEC 17025 accredited lab, testing the finished product, less than 2 years old.
B
Some proof of testing (a COA or a certification), but not everything Tier A needs.
C
No COA and no certification found.

Prices are read from each store's own page and marked stale after 14 days. A certification counts only if it appears on the certifier's own website. Star ratings are each store's own customer reviews, shown for reference; they never affect the order of the table.