PlainVitamins

C-500 Calcium Ascorbate-C

by NOW · capsule · 250 capsules

  • On the market (NIH)
  • UPC 7 33739 00677 6
  • DSLD label 244648
  • Serving 1 veg capsule

C-500 Calcium Ascorbate-C by NOW lists 3 ingredients, 3 with an amount per serving of 1 veg capsule, such as 500 mg of vitamin C, 55 mg of calcium and 10 mg of citrus bioflavonoid complex. Its current label entered the NIH Dietary Supplement Label Database on February 25, 2021.

What is in C-500 Calcium Ascorbate-C?

Each row as the label prints it, per serving of 1 veg capsule. 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).

C-500 Calcium Ascorbate-C: Supplement Facts rows against the market (DSLD label 244648, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Cas Calcium AscorbateVitamin C (Form: from Calcium Ascorbate)500 mg556%Vitamin C in C-500 Calcium Ascorbate-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). Per day at the most servings: 1,500 mg.

Calciumas Calcium AscorbateCalcium (Form: from Calcium Ascorbate)55 mg4%Calcium in C-500 Calcium Ascorbate-C against 17,831 products55 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg55 mg

71% of 17,831 products listing calcium give more (median 115 mg). Per day at the most servings: 165 mg.

Citrus Bioflavonoid Complex10 mgFlavonoid in C-500 Calcium Ascorbate-C against 2,343 products10 mg per serving; the middle half of products list 25 mg to 100 mg, the median 50 mg.10 mg

89% of 2,343 products listing flavonoid give more (median 50 mg). Per day at the most servings: 30 mg.

Source: NIH ODS Dietary Supplement Label Database, label 244648 (entered February 25, 2021), version 9.4.0. See the label on DSLD. Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • 89% of the 2,343 products that print an amount of flavonoid list more than its 10 mg of citrus bioflavonoid complex (filed by NIH under flavonoid) (median 50 mg).

The NIH database records 1 to 3 servings 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.

Which products have the closest formulas?

6 products list the very same ingredients; the nearest amounts come first.

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

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
Suggested Usage: Take 1 capsule 1 to 3 times daily.
Warnings
Caution: For adults only.
Consult physician if pregnant/nursing, taking medication, or have a medical condition.
Keep out of reach of children.
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Allergens and what it does not contain
Non-GMO
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients.
Storage
Store in a cool, dry place after opening.

Source: label statements in DSLD label 244648.

What else is on the label?

Other ingredients: Hypromellose, Microcrystalline Cellulose, Stearic Acid.

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

How many labels does C-500 Calcium Ascorbate-C have?

8 labels are on file under this name since October 25, 2012: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 244648 (current) Entered February 25, 2021 · on the market · 250 capsules · UPC 7 33739 00677 6
  2. Label 244644 Entered February 25, 2021 · on the market · 100 veg capsules · UPC 7 33739 00676 9
  3. Label 177431 Entered May 24, 2018 · off the market August 14, 2023 · 100 capsules · UPC 7 33739 00676 9
  4. Label 70264 Entered January 25, 2017 · off the market August 14, 2023 · 250 capsules · UPC 7 33739 00677 6
  5. Label 49869 Entered August 25, 2015 · off the market November 30, 2016 · 250 capsules · UPC 7 33739 00677 6
  6. Label 48094 Entered August 25, 2015 · off the market January 12, 2018 · 100 capsules · UPC 7 33739 00676 9
  7. Label 14390 Entered February 25, 2013 · off the market June 30, 2015 · 100 capsules · UPC 7 33739 00676 9
  8. Label 14393 Entered October 25, 2012 · off the market July 21, 2015 · 250 capsules · UPC 7 33739 00677 6

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

Who makes it?

The label names NOW Foods (manufacturer), Bloomingdale, IL. All NOW products.

Where next?