vitamin

Vitamin C supplements

Half of the 18,583 vitamin C supplements in the NIH label database that print an amount list 100 mg or less per serving; the middle half list 60 mg to 270 mg, and 1 in 82 of the 18,422 with a plausible amount give more than the adult upper limit at the most servings their labels direct (DSLD version 9.4.0, January 2026). The 775 products whose only supplement ingredient is vitamin C list a median of 500 mg, and 1 in 15 of them give more than the upper limit.

How much vitamin C do supplements contain?

The median product lists 100 mg per serving. One in ten lists 21 mg or less, one in ten 750 mg or more. The amount printed most often is 60 mg (2,234 products).

How do the amounts compare with the Daily Value and the upper limit?

The FDA Daily Value for vitamin C is 90 mg (adults and children 4 and older). The median product gives 111% of it per serving; the 90th percentile 833%.

The adult Tolerable Upper Intake Level is 2,000 mg a day (total intake from food, water and supplements). At the most servings their labels direct, 224 of the 18,422 products with a plausible amount (1.2%) give more than that from the supplement alone (what counts as plausible).

The upper limit is for total intake from food, water and supplements unless stated, and does not apply under medical supervision. A label amount is what the maker printed. This is data, not advice: the NIH ODS fact sheets explain what each nutrient does.

Which products list the most vitamin C?

On-market products, per serving, with a plausible amount: the rule leaves out likely entry slips, such as an amount far beyond every other label with no %DV or strength on the label to back it (each product page still shows its own amount, marked).

• Ultra Preventive Forte-Chel (Capsules)Douglas Laboratories3,000 mg
• Ultra Preventive Forte-ChelDouglas Laboratories3,000 mg
• C-500Optimox3,000 mg
• C Buffered CrystalsThompson3,000 mg
• Vitamin C 1,000 mgIndiana Botanic Gardens3,000 mg
• Anti-Alcohol Antioxidants With HepatoProtection ComplexLife Extension3,000 mg
• Mega-Liposomal Vitamin C 3000 mgAurora Nutrascience3,000 mg
• Ortho C+ Lemon FlavorAOR Advanced Orthomolecular Research Premium3,000 mg

Have the amounts changed over the years?

Products whose current label entered DSLD in 2011 list a median of 120 mg; those entered in 2025, 100 mg.

In which products and brands?

Brands listing it most: Nature's Way (366), Douglas Laboratories (330), Nature's Plus (284), ProCaps Laboratories (169), Bronson (151), NOW (144), Country Life (129), Puritan's Pride (110), Source Naturals (108), Nature Made (106).

Every product listing vitamin C

19,919 products, A to Z by name (page 55 of 399), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.

• Buffered Lemon C PowderNatural Healthy Concepts2,350 mg
• Buffered Magnesium AscorbateNOW820 mg
• Buffered Magnesium Ascorbate Vitamin C PowderSwanson Premium Brand · off the market830 mg
• Buffered Magnesium Oxide 180 mgKirkman20 mg
• Buffered Sodium Ascorbate Vitamin C PowderSwanson Premium Brand · off the market1,770 mg
• Buffered Super Bio Vitamin C 1000 mgSolaray1,000 mg
• Buffered Vit CHigher Nature · off the market906 mg
• Buffered Vitamin CJarrow Formulas · off the market820 mg
• Buffered Vitamin CHigher Nature906 mg
• Buffered Vitamin CNutrition Rescue1,068 mg
• Buffered Vitamin CDr. Clark Research Association Dr. Clark Zentrum1,000 mg
• Buffered Vitamin CAllergy Research Group1 mg as transcribed, likely a slip
• Buffered Vitamin CNutriCology1,000 mg
• Buffered Vitamin CFreeda500 mg
• Buffered Vitamin CIntegrative Therapeutics1,000 mg
• Buffered Vitamin CNutriBiotic Immunity500 mg
• Buffered Vitamin C + Citrus BioflavonoidsJarrow Formulas500 mg
• Buffered Vitamin C + Citrus Bioflavonoids 750 mgJarrow Formulas · off the market500 mg
• Buffered Vitamin C - Unflavored PowderKirkman · off the market1,100 mg
• Buffered Vitamin C 1,000 mgCountry Life1,000 mg
• Buffered Vitamin C 1,250 mg w/BioflavonoidsWonder Laboratories1,000 mg
• Buffered Vitamin C 1000Vinco1,000 mg
• Buffered Vitamin C 1000 mgMartin Avenue Pharmacy1,000 mg
• Buffered Vitamin C 1000 mgUniversal Nutrition / Universal Naturals1,000 mg
• Buffered Vitamin C 1000 mgMetabolic Maintenance1,000 mg
• Buffered Vitamin C 1000 mgBluebonnet1,000 mg
• Buffered Vitamin C 2500 mg w/BioflavonoidsWonder Labs · off the market2,000 mg
• Buffered Vitamin C 500 mgWhole Foods500 mg
• Buffered Vitamin C 500 mgSchiff500 mg
• Buffered Vitamin C 500 mgFreeda · off the market500 mg
• Buffered Vitamin C 500 mgMetabolic Maintenance500 mg
• Buffered Vitamin C 500 mgBluebonnet500 mg
• Buffered Vitamin C 500 mgSwanson · off the market500 mg
• Buffered Vitamin C 500 mgCountry Life500 mg
• Buffered Vitamin C 500 mgSolaray500 mg
• Buffered Vitamin C 500 mg Calcium AscorbateGood 'N Natural · off the market500 mg
• Buffered Vitamin C 800 mgSolaray800 mg
• Buffered Vitamin C Cassava SourceAllergy Research Group1,000 mg
• Buffered Vitamin C Cassava Source with Calcium and MagnesiumNutriCology · off the market1,000 mg
• Buffered Vitamin C Chewable 485 mg Natural Orange FlavorSolaray485 mg
• Buffered Vitamin C Chewable 500 mg Natural Orange FlavorSolaray · off the market500 mg
• Buffered Vitamin C CrystalsEcological Formulas1,250 mg
• Buffered Vitamin C CrystalsVitamin Discount Center · off the market1,000 mg
• Buffered Vitamin C PowderMartin Avenue Pharmacy2,350 mg
• Buffered Vitamin C PowderLife Extension4,000 mg as transcribed, likely a slip
• Buffered Vitamin C PowderAllergy Research Group1.07 mg as transcribed, likely a slip
• Buffered Vitamin C PowderNutriCology1,067 mg
• Buffered Vitamin C PowderGroovy Bee880 mg
• Buffered Vitamin C Powder FlavoredKirkman · off the market1,100 mg
• Buffered Vitamin C Powder Passionfruit FlavorKirkman1,100 mg

Where next?

• Liquid vitamin C
• Vitamin C capsules
• Vitamin C drops
• Vitamin C gummies
• Vitamin C powder
• Check an amount of vitamin C
• Labels above the upper limit
• All ingredients