PlainVitamins

Acid Block

by Rx Vitamins · tablet or pill · 60 chewable tablets

  • On the market (NIH)
  • UPC 0 08429 04015 7
  • DSLD label 42025
  • Serving 1 to 2 chewable tablets; amounts per 1 chewable tablet
  • 60 servings

Acid Block by Rx Vitamins lists 4 ingredients, 4 with an amount per serving of 1 chewable tablet, such as 30 mg of calcium carbonate, 450 mg of alginic acid, 250 mg of licorice and 50 mg of slippery elm, beside 3 Nutrition Facts rows (calories, fat and the like). Its current label entered the NIH Dietary Supplement Label Database on February 25, 2015.

What is in Acid Block?

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

Acid Block: Supplement Facts rows against the market (DSLD label 42025, January 2026 release)
IngredientAmount% DVAmong products listing it
Calories10 Calories
Total Carbohydrates2 g1%Carbohydrate in Acid Block 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).

Sugar2 gSugar in Acid Block 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).

Calcium Carbonate30 mg3%

The label names the compound (Calcium Carbonate); its amount is likely the compound's weight, not the calcium it holds, so it is not placed among other products.

Alginic Acid450 mg
Licoriceas GlycyrrhizinLicorice (Form: standardized < 2% Glycyrrhizin Note: <10% mg) PlantPart: root Genus: Glycyrrhiza Species: glabra250 mgLicorice in Acid Block against 888 products250 mg per serving; the middle half of products list 42 mg to 300 mg, the median 100 mg.250 mg

Higher than 73% of 888 products listing licorice (median 100 mg).

Sodium Alginate50 mgSodium in Acid Block against 14,514 products50 mg per serving; the middle half of products list 15 mg to 142 mg, the median 55 mg.50 mg

51% of 14,514 products listing sodium give more (median 55 mg).

Slippery Elmas PhytosterolsSlippery Elm (Form: standardized 20% Phytosterols) PlantPart: bark50 mgSlippery Elm in Acid Block against 232 products50 mg per serving; the middle half of products list 50 mg to 300 mg, the median 150 mg.50 mg

74% of 232 products listing slippery elm give more (median 150 mg).

Source: NIH ODS Dietary Supplement Label Database, label 42025 (entered February 25, 2015), 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?

The products whose ingredient lists overlap most with Acid Block'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
Recommended Usage: As a dietary supplement, chew 1-2 tablets after meals or before retiring. For best results, drink a glass of water after chewing tablets.
Warnings
Do not use if tamper-evident seal is broken or missing.
KEEP OUT OF REACH OF CHILDREN
Allergens and what it does not contain
Contains no yeast, dairy, eggs, gluten, corn, wheat, starch, artificial colors or preservatives.

Source: label statements in DSLD label 42025.

What else is on the label?

Other ingredients: Fruit Sugar, proprietary FOS, Chicory root extract, Mung Bean extract, Stearic Acid.

How many labels does Acid Block have?

One label is on file, entered on February 25, 2015.

  1. Label 42025 (current) Entered February 25, 2015 · on the market · 60 chewable tablets · UPC 0 08429 04015 7

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

Who makes it?

The label names Rx Vitamins Inc. (manufacturer, distributor), Elmsford, NY. All Rx Vitamins products.

Where next?