PlainVitamins

Vitamin C

by Isotonix · powder · 3.5 ounces

  • On the market (NIH)
  • UPC 8 48570 00688 2
  • DSLD label 313416
  • Serving 3.3 g (1 capful)
  • 30 servings

Vitamin C by Isotonix lists 3 ingredients, 3 with an amount per serving of 3.3 g, such as 240 mcg RAE of vitamin A, 500 mg of vitamin C and 100 mg of potassium, beside 3 Nutrition Facts rows (calories, fat and the like). Its current label entered the NIH Dietary Supplement Label Database on July 25, 2024.

What is in Vitamin C?

Each row as the label prints it, per serving of 3.3 g. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

Vitamin C: Supplement Facts rows against the market (DSLD label 313416, January 2026 release)
IngredientAmount% DVAmong products listing it
Calories10 Calories
Total Carbohydrates2 g1%Carbohydrate in Vitamin C against 21,979 products2 g per serving; the middle half of products list 1 g to 6 g, the median 3 g.2 g

58% of 21,979 products listing carbohydrate give more (median 3 g).

Total Sugars2 gSugar in Vitamin C against 11,807 products2 g per serving; the middle half of products list 1 g to 4 g, the median 2 g.2 g

48% of 11,807 products listing sugar give more (median 2 g).

Added Sugars2 g4%
Vitamin Aas Beta-Carotene240 mcg RAE27%
Vitamin Cas Ascorbic Acid500 mg556%Vitamin C in Vitamin C against 18,583 products500 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg500 mg

Higher than 81% of 18,583 products listing vitamin C (median 100 mg).

Potassiumas Potassium Bicarbonate100 mg2%Potassium in Vitamin C against 11,614 products100 mg per serving; the middle half of products list 50 mg to 190 mg, the median 99 mg.DV 4,700 mg100 mg

Higher than 51% of 11,614 products listing potassium (median 99 mg).

Source: NIH ODS Dietary Supplement Label Database, label 313416 (entered July 25, 2024), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.

The NIH database records one serving a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions
Directions for use: Pour 1 level, white bottle capful of powder into the overcap. Add water to the line on the overcap (2 fl oz/60 mL) and stir. As a dietary supplement, take once daily or as directed by your healthcare provider. Maximum absorption occurs when taken on an empty stomach. This product is isotonic only if the specified amounts of powder and water are used.
Warnings
Warning: If you are currently using prescription drugs, have an ongoing medical condition, or are pregnant or breastfeeding, consult your healthcare provider before using this product.
Keep out of the reach of children.
Do not use if safety seal is broken or missing.
Resale on third-party websites is strictly prohibited unless specifically authorized by Market America or its corporate affiliates. If barcodes are altered or you purchase this product from an unauthorized third-party website, the product is not guaranteed by Market America or its corporate affiliates.
Allergens and what it does not contain
This vegan product contains no added wheat, soy, yeast, gluten, artificial flavor, salt, preservatives or milk.
Gluten free
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 313416.

What else is on the label?

Other ingredients: Fructose, Glucose, Maltodextrin, Malic Acid, Orange flavor, Silica, Citric Acid, Stearic Acid.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Vegan.

How many labels does Vitamin C have?

4 labels are on file under this name since January 24, 2014: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 313416 (current) Entered July 25, 2024 · on the market · 3.5 ounces · UPC 8 48570 00688 2
  2. Label 217865 Entered April 23, 2020 · off the market October 4, 2023 · 3.5 oz. · UPC 8 48570 00688 2
  3. Label 202714 Entered May 28, 2019 · on the market · 300 grams
  4. Label 29515 Entered January 24, 2014 · off the market October 25, 2019 · 3.5 oz.

DSLD also links this label to: Vitamin D with K2 (package size difference, same product).

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names Market America, Inc. (distributor), Greensboro, NC. All Isotonix products.

Where next?