Ester-C 24 Hour Immune Support 500 mg
by NatureSmart · tablet or pill · 60 vegetarian coated tablets
- On the market (NIH)
- UPC 0 25077 16970 2
- DSLD label 277269
- Serving 2 tablets
- 30 servings
Ester-C 24 Hour Immune Support 500 mg by NatureSmart lists 11 ingredients, 3 with an amount per serving of 2 tablets, such as 1,000 mg of vitamin C, 110 mg of calcium and 204 mg of C-sorb citrus bioflavonoid complex; 8 sit inside a blend without their own amounts. Its current label entered the NIH Dietary Supplement Label Database on October 24, 2022.
What is in Ester-C 24 Hour Immune Support 500 mg?
Each row as the label prints it, per serving of 2 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).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| Vitamin Cas Ester-C Calcium AscorbateVitamin C (Form: as Ester-C Calcium Ascorbate) | 1,000 mg | 1,111% | Higher than 91% of 18,583 products listing vitamin C (median 100 mg). |
| Calciumas Ester-C Calcium AscorbateCalcium (Form: as Ester-C Calcium Ascorbate) | 110 mg | 8% | 51% of 17,831 products listing calcium give more (median 115 mg). |
| C-Sorb Citrus Bioflavonoid Complex | 204 mg | Higher than 88% of 2,343 products listing flavonoid (median 50 mg). | |
| Citrus Bioflavonoid Complexas Citrus spp. | no amount given | ||
| sweet Orange | no amount given | ||
| Tangerine | no amount given | ||
| Lime | no amount given | ||
| Lemon | no amount given | ||
| Acerola extract | no amount given | ||
| Rutin | no amount given | ||
| Hesperidin Complexas Citrus spp. | no amount given | ||
| naturally occurring Vitamin C Metabolites | no amount given |
Source: NIH ODS Dietary Supplement Label Database, label 277269 (entered October 24, 2022), 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:
- Its 1,000 mg of vitamin C is higher than 91% of the 18,583 vitamin C products that print an amount; 445 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?
5 products list the very same ingredients; the nearest amounts come first.
- Vitamin C 1000 mgSpring Valley same ingredients
- Ester-CAmerican Health · off the market same ingredients
- Ester-C 24 Hour Immune Support 1000 mgNatureSmart same ingredients
- Ester-C 24 Hour Immune SupportNatureSmart same ingredients
- Ester-C 500 mg with BioflavonoidsPhysioLogics · off the market same ingredients
- Ester-C 1000 mg with Citrus BioflavonoidsPhysioLogics · off the market 9 shared, 89% alike
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: For adults, take two (2) tablets once daily, preferably with a meal.
- Warnings
- Warning: If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use.
- Discontinue use and consult your doctor if any adverse reactions occur.
- Keep out of reach of children.
- Do not use if seal under cap is broken or missing.
- Allergens and what it does not contain
- Vitamin C also contributes to the health of your upper respiratory tract, plus, Ester-C Vitamin C is manufactured without chemicals to neutralize pH, which means it's non-acidic and gentle on your stomach.
- Non-gmo. No gluten, no wheat, no milk, no lactose, no artificial color, flavor or sweetener, no sugar, no starch, no soy, no yeast, no fish. Sodium free.
- Non GMO
- Storage
- Store at room temperature.
Source: label statements in DSLD label 277269.
What else is on the label?
Other ingredients: Vegetable Cellulose, Calcium Silicate, Maltodextrin, natural Palm leaf glaze, Triacetin, Vegetable Magnesium Stearate, Vegetable Stearic Acid.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Made in the USA with select ingredients from around the world.
How many labels does Ester-C 24 Hour Immune Support 500 mg have?
One label is on file, entered on October 24, 2022.
- Label 277269 (current) Entered October 24, 2022 · on the market · 60 vegetarian coated tablets · UPC 0 25077 16970 2
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names NatureSmart, LLC (manufacturer), Bohemia, NY. All NatureSmart products.