Check a label

Vitamin C supplements

Vitamin C is judged on what a day of the label's directions gives. Blood levels climb steeply up to about 200 mg a day and are saturated by 1,000 mg, so studies of vitamin C supplements use 200–1,000 mg a day. The RDA, set to prevent deficiency, is 90 mg for men and 75 mg for women, and anything over the 2,000 mg upper limit is flagged. Commission never changes the order.

Powders (1)

ProductPer servingServings a dayPer day, as directedVerdictProof
Emergen-C 1,000 mg Vitamin C · label 24 Oct 20241 g1 serving1 gEffective doseLabel claim only

Gummies (1)

ProductPer servingServings a dayPer day, as directedVerdictProof
Airborne Original Gummies · label 23 Aug 2022750 mg in 3 gummies1 serving750 mgEffective doseLabel claim only

Capsules (11)

ProductPer servingServings a dayPer day, as directedVerdictProof
Dr. Mercola Liposomal Vitamin C 1,000 mg · label 22 Jun 20231 g in 2 capsules1 serving1 gEffective doseLabel claim only
MegaFood Liposomal Vitamin C 1000 mg · label 25 Sep 20251 g in 2 capsules1 serving1 gEffective doseLabel claim only
NutraBio Vitamin C 1000 mg · label 25 Sep 20241 g in 1 capsule1 serving1 gEffective doseLabel claim only
Puritan's Pride Ester-C · label 22 Jun 20231 g in 2 capsules1 serving1 gEffective doseLabel claim only
Solaray Buffered Super Bio Vitamin C 1000 mg · label 22 Aug 20251 g in 2 capsules1 serving1 gEffective doseLabel claim only
Twinlab C-1000 Caps · label 16 Jun 20221 g in 1 capsule1 serving1 gEffective doseLabel claim only
Pure Encapsulations Ester-C & Flavonoids · label 22 Jun 2023619 mg in 1 capsule1–2 servings619 mg–1.24 gEffective doseLabel claim only
Amazon Elements Whole Food Vitamin C 500 mg · label 14 Dec 2023500 mg in 2 capsules1 serving500 mgEffective doseLabel claim only
Bluebonnet Vitamin C 500 mg · label 23 Jan 2023500 mg in 1 capsule1 serving500 mgEffective doseLabel claim only
Garden of Life Vitamin Code Raw Vitamin C · label 23 Jan 2025500 mg in 2 capsules1 serving500 mgEffective doseLabel claim only
Sports Research Vitamin C 1000 mg · label 25 Mar 20251 g in 1 capsule1–3 servings1–3 gOver the upper limitLabel claim only

Tablets (7)

ProductPer servingServings a dayPer day, as directedVerdictProof
Airborne Citrus Chewable Tablets · label 11 Oct 20261 g in 4 tablets1 serving1 gEffective doseLabel claim only
Airborne Original Effervescent Tablets · label 23 May 20241 g in 1 tablet1–2 servings1–2 gEffective doseLabel claim only
Member's Mark Vitamin C 1000 mg · label 23 Aug 20221 g in 1 tablet1 serving1 gEffective doseLabel claim only
NOW Foods C-1000 · label 23 May 20241 g in 1 tablet1 serving1 gEffective doseLabel claim only
Puritan's Pride C-1000 mg · label 21 Feb 20231 g in 1 tablet1 serving1 gEffective doseLabel claim only
Nature Made Vitamin C 500 mg · label 20 Jun 2024500 mg in 1 tablet1 serving500 mgEffective doseLabel claim only
Source Naturals C-1000 · label 22 Jun 20231 g in 1 tablet3 servings3 gOver the upper limitLabel claim only

Liquids (1)

ProductPer servingServings a dayPer day, as directedVerdictProof
Beekeeper's Naturals Propolis + Vitamin C Liposomal · label 11 Oct 20261 g in 1 packet1 serving1 gEffective doseLabel claim only

21 products. Where the directions give a range, the verdict judges the most they give in a day. Read the vitamin c guide for the studies behind the dose. "Proof" is a published independent lab test, a certifier listing we read on the certifier's own site (usually for listed lots only), or "Label claim only" when we found neither.