PlainVitamins

Magnesium Oxide Pure Powder

by NOW · powder · 8 oz.

  • On the market (NIH)
  • UPC 7 33739 01310 1
  • DSLD label 72119
  • Serving 0.25 tsp (approx. 500 mg)
  • 454 servings

Magnesium Oxide Pure Powder by NOW lists one ingredient: 290 mg of magnesium per serving of 0.25 tsp. Its current label entered the NIH Dietary Supplement Label Database on April 25, 2017.

What is in Magnesium Oxide Pure Powder?

Each row as the label prints it, per serving of 0.25 tsp. 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).

Magnesium Oxide Pure Powder: Supplement Facts rows against the market (DSLD label 72119, January 2026 release)
IngredientAmount% DVAmong products listing it
Magnesiumas Magnesium OxideMagnesium (Form: from Magnesium Oxide)290 mg69%Magnesium in Magnesium Oxide Pure Powder against 14,003 products290 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg290 mg

Higher than 87% of 14,003 products listing magnesium (median 86 mg).

Source: NIH ODS Dietary Supplement Label Database, label 72119 (entered April 25, 2017), 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.

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
Suggested Usage: Mix 1/4 level teaspoon of powder into at least 6 oz. of cold water or clear liquid. Take once daily with a meal. Pure Magnesium Oxide Powder can increase the temperature of liquids upon contact; therefore, the recommended serving must be mixed into at least 6 oz. of cold liquid to neutralize this reaction prior to ingestion.
Warnings
Caution: This product must be dissolved into at least 6 oz. of cold water or clear liquid before consuming. Do not breathe powder and avoid contact with skin, eyes, and clothing. For adults only.
Consult physician if pregnant/nursing, taking medication, or have a medical condition.
Keep out of reach of children.
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Allergens and what it does not contain
Non-GMO
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients.
Storage
Store in a cool, dry place after opening.

Source: label statements in DSLD label 72119.

What else is on the label?

Other ingredients: None.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): NON GMO Project Verified nongmoproject.org; GMP Quality Assured.

How many labels does Magnesium Oxide Pure Powder have?

3 labels are on file under this name since October 22, 2015: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 72119 (current) Entered April 25, 2017 · on the market · 8 oz. · UPC 7 33739 01310 1
  2. Label 60659 Entered June 24, 2016 · off the market March 7, 2017 · 8 oz. · UPC 7 33739 01310 1
  3. Label 51758 Entered October 22, 2015 · off the market March 31, 2016 · 8 oz. · UPC 7 33739 01310 1

DSLD also links this label to: Magnesium Oxide (image difference, same product), Magnesium Oxide (image 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 NOW Foods (manufacturer), Bloomingdale, IL. All NOW products.

Where next?