C 500
by 21st Century · tablet or pill · 250 tablets
- Off the market since August 2020 (NIH)
- UPC 7 40985 22338 3
- DSLD label 233368
- Serving 1 tablet
C 500 by 21st Century lists 2 ingredients, 2 with an amount per serving of 1 tablet, such as 500 mg of vitamin C and 30 mg of calcium. Its current label entered the NIH Dietary Supplement Label Database on August 23, 2020.
What is in C 500?
Each row as the label prints it, per serving of 1 tablet. 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).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| Vitamin Cas Ascorbic Acid | 500 mg | 833% | Higher than 81% of 18,583 products listing vitamin C (median 100 mg). |
| Calciumas Calcium CarbonateCalcium (Form: as Calcium Carbonate) | 30 mg | 3% | 84% of 17,831 products listing calcium give more (median 115 mg). |
Source: NIH ODS Dietary Supplement Label Database, label 233368 (entered August 23, 2020), 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?
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.
Which products have the closest formulas?
6 products list the very same ingredients; the nearest amounts come first.
- C 500 mg21st Century same ingredients
- Formula 601DC same ingredients
- Delayed Release C 500 mgMason Natural same ingredients
- Chewable Vitamin C 500 mg Natural Orange FlavorPharmax same ingredients
- Non-Acid Vitamin C-500Windmill · off the market same ingredients
- Buffered Vitamin C 500 mg Calcium AscorbateGood 'N Natural · off the market same ingredients
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
- Directions: As a vitamin supplement, adults take one (1) tablet daily with any meal or as directed by a healthcare provider. Do not exceed recommended dosage.
- Warnings
- Warning: Consult a healthcare provider prior to use if pregnant, nursing, on medications, have a medical condition or are planning a medical procedure.
- Stop use and contact a physician if adverse reactions occur.
- Keep out of reach of children.
- Do not use if product appears to be tampered with or seal is broken.
- Allergens and what it does not contain
- No added sugar, yeast, preservatives or artificial flavors.
- Gluten free
- Storage
- Store at room temperature.
Source: label statements in DSLD label 233368.
What else is on the label?
Other ingredients: Stearic Acid, Cellulose, Croscarmellose Sodium, Hydroxypropyl Methylcellulose, Contains Less Than 2% of.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Guaranteed Quality Laboratory Tested.
How many labels does C 500 have?
4 labels are on file under this name since July 25, 2012: other sizes, label designs and reformulations. The current one leads this page.
- Label 233368 (current) Entered August 23, 2020 · off the market August 5, 2020 · 250 tablets · UPC 7 40985 22338 3
- Label 11079 Entered July 25, 2012 · off the market June 28, 2019 · 250 tablets · UPC 7 40985 22338 3
- Label 11077 Entered July 25, 2012 · off the market March 14, 2019 · 110 tablets · UPC 7 40985 21190 8
- Label 11070 Entered July 25, 2012 · off the market June 28, 2019 · 110 tablets · UPC 7 40985 22316 1
DSLD also links this label to: C 500 mg (package size difference, same product), C 500 mg (package size difference, same product), C 500 mg (image difference, same product), C 500 mg (package size difference, same product), C 500 mg (package size difference, same product), C 500 mg (package size difference, same product), C 500 mg (image difference, same product), C 500 mg (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 21st Century HealthCare, Inc. (manufacturer), Tempe, AZ. All 21st Century products.