PlainVitamins

Oyster Shell Calcium & Magnesium

by Nature's Blend · tablet or pill · 100 tablets

  • On the market (NIH)
  • UPC 0 79854 50023 3
  • DSLD label 274596
  • Serving 3 tablets
  • 33 servings

Oyster Shell Calcium & Magnesium by Nature's Blend lists 2 ingredients, 2 with an amount per serving of 3 tablets, such as 750 mg of calcium and 465 mg of magnesium. Its current label entered the NIH Dietary Supplement Label Database on August 23, 2022.

What is in Oyster Shell Calcium & Magnesium?

Each row as the label prints it, per serving of 3 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).

Oyster Shell Calcium & Magnesium: Supplement Facts rows against the market (DSLD label 274596, January 2026 release)
IngredientAmount% DVAmong products listing it
Calciumas Oyster ShellOyster Shell Calcium750 mg58%Calcium in Oyster Shell Calcium & Magnesium against 17,831 products750 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg750 mg

Higher than 94% of 17,831 products listing calcium (median 115 mg).

Magnesiumas Magnesium Oxide465 mg111%Magnesium in Oyster Shell Calcium & Magnesium against 14,003 products465 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg465 mg

Higher than 96% of 14,003 products listing magnesium (median 86 mg). 1.3 times the adult UL a day.

Source: NIH ODS Dietary Supplement Label Database, label 274596 (entered August 23, 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 750 mg of calcium is higher than 94% of the 17,831 calcium products that print an amount; 985 list more.
  • At 1 serving a day, the most its directions give, the label lists 465 mg of magnesium, 1.3 times the adult Tolerable Upper Intake Level.

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.

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 dietary supplement, take three tablets daily, preferably with a meal, or as directed by your healthcare professional.
Warnings
Keep out of the reach of children.
Double safety sealed for your protection. Do not use if either seal is broken or missing.
Allergens and what it does not contain
Preservative & gluten free. No starch, artificial colors, artificial flavors, wheat, yeast, or corn added.
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 274596.

What else is on the label?

Other ingredients: Modified Cellulose, Croscarmellose Sodium, Maltodextrin, Acacia Gum, Magnesium Stearate, Stearic Acid, Silicon Dioxide, Triacetin, Polydextrose, Wax.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Lab Tested Potency Assay Guaranteed Release.

How many labels does Oyster Shell Calcium & Magnesium have?

One label is on file, entered on August 23, 2022.

  1. Label 274596 (current) Entered August 23, 2022 · on the market · 100 tablets · UPC 0 79854 50023 3

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

Who makes it?

The label names National Vitamin Company (manufacturer), Casa Grande, AZ. All Nature's Blend products.

Where next?