PlainVitamins

C-Ascorbs Sustained Release

by NaturesPlus · tablet or pill · 180 tablets

  • On the market (NIH)
  • UPC 0 97467 03691 8
  • DSLD label 298620
  • Serving 4 tablets
  • 45 servings

C-Ascorbs Sustained Release by NaturesPlus lists 10 ingredients, 9 with an amount per serving of 4 tablets, such as 4,000 mg of vitamin C, 212 mg of calcium, 108 mg of magnesium and 10 mg of zinc; 1 sits inside a blend without its own amount, beside 2 Nutrition Facts rows (calories, fat and the like). Its current label entered the NIH Dietary Supplement Label Database on October 24, 2023.

What is in C-Ascorbs Sustained Release?

Each row as the label prints it, per serving of 4 tablets. 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-Ascorbs Sustained Release: Supplement Facts rows against the market (DSLD label 298620, January 2026 release)
IngredientAmount% DVAmong products listing it
Total Carbohydrates1 g1%Carbohydrate in C-Ascorbs Sustained Release against 21,979 products1 g per serving; the middle half of products list 1 g to 6 g, the median 3 g.1 g

74% of 21,979 products listing carbohydrate give more (median 3 g).

Dietary Fiber1 g4%Fiber in C-Ascorbs Sustained Release against 6,987 products1 g per serving; the middle half of products list 1 g to 4 g, the median 2 g.1 g

56% of 6,987 products listing fiber give more (median 2 g).

Vitamin Cas Ascorbic Acid, Mineral Ascorbates4,000 mg4,444%

This amount is far outside what other labels list for vitamin C, or disagrees with the label's own %DV: possibly a unit or transcription slip in the database. Check the label image on DSLD.

Calciumas Calcium Ascorbate212 mg16%Calcium in C-Ascorbs Sustained Release against 17,831 products212 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg212 mg

Higher than 70% of 17,831 products listing calcium (median 115 mg).

Magnesiumas Magnesium Ascorbate108 mg26%Magnesium in C-Ascorbs Sustained Release against 14,003 products108 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg108 mg

Higher than 63% of 14,003 products listing magnesium (median 86 mg).

Zincas Zinc Ascorbate10 mg91%Zinc in C-Ascorbs Sustained Release against 13,186 products10 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg10 mg

51% of 13,186 products listing zinc give more (median 11 mg).

Manganeseas Manganese Ascorbate0.4 mg17%Manganese in C-Ascorbs Sustained Release against 7,016 products0.4 mg per serving; the middle half of products list 1 mg to 3.92 mg, the median 2 mg.DV 2.3 mgUL 11 mg0.4 mg

91% of 7,016 products listing manganese give more (median 2 mg).

Potassiumas Potassium Ascorbate240 mg5%Potassium in C-Ascorbs Sustained Release against 11,614 products240 mg per serving; the middle half of products list 50 mg to 190 mg, the median 99 mg.DV 4,700 mg240 mg

Higher than 83% of 11,614 products listing potassium (median 99 mg).

Lemon Bioflavonoid Complex400 mgFlavonoid in C-Ascorbs Sustained Release against 2,343 products400 mg per serving; the middle half of products list 25 mg to 100 mg, the median 50 mg.400 mg

Higher than 93% of 2,343 products listing flavonoid (median 50 mg).

Active Flavanones48%192 mg
Flavanols2%8 mgFlavanols in C-Ascorbs Sustained Release against 30 products8 mg per serving; the middle half of products list 43.75 mg to 375 mg, the median 212.5 mg.8 mg

80% of 30 products listing flavanols give more (median 212.5 mg).

Flavonesno amount given
Phenolic Compoundsrelatedno amount given

Source: NIH ODS Dietary Supplement Label Database, label 298620 (entered October 24, 2023), 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?

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:

  • 91% of the 7,016 products that print an amount of manganese list more than its 0.4 mg of manganese (median 2 mg).
  • Its 400 mg of lemon bioflavonoid complex (filed by NIH under flavonoid) is higher than 93% of the 2,343 flavonoid products that print an amount; 139 list more.

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?

The products whose ingredient lists overlap most with C-Ascorbs Sustained Release's, rare ingredients counting for more.

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: Four tablets once daily.
Warnings
Keep out of reach of children.
Allergens and what it does not contain
Free from artificial colors and artificial preservatives. Free from all of the major allergens identified in the U.S. Food Allergen Labeling and Consumer Protection Act.
Gluten Free
Storage
Keep tightly closed in a cool, dry place.

Source: label statements in DSLD label 298620.

What else is on the label?

Other ingredients: Hydroxypropyl Methylcellulose, Stearic Acid, Microcrystalline Cellulose, Dicalcium Phosphate, Rutin, Magnesium Stearate, Silica, Pharmaceutical Glaze.

How many labels does C-Ascorbs Sustained Release have?

One label is on file, entered on October 24, 2023.

  1. Label 298620 (current) Entered October 24, 2023 · on the market · 180 tablets · UPC 0 97467 03691 8

DSLD also links this label to: Sustained Release C-Ascorbs (package size difference, same product), Sustained Release C-Ascorbs (image difference, same product), Sustained Release C-Ascorbs (package size difference, same product), Sustained Release C-Ascorbs (image difference, same product), Sustained Release C-Ascorbs (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 Natural Organics Laboratories, Inc. makers of Nature's Plus (manufacturer), Amityville, New York. All NaturesPlus products.

Where next?