PlainVitamins

Magnesium Oxide 400

by Wonder Labs · tablet or pill · 120 tablets

  • On the market (NIH)
  • UPC 0 99528 68012 2
  • DSLD label 316128
  • Serving 2 tablets
  • 60 servings

Magnesium Oxide 400 by Wonder Labs lists one ingredient: 482.6 mg of magnesium per serving of 2 tablets. Its current label entered the NIH Dietary Supplement Label Database on October 24, 2024.

What is in Magnesium Oxide 400?

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).

Magnesium Oxide 400: Supplement Facts rows against the market (DSLD label 316128, January 2026 release)
IngredientAmount% DVAmong products listing it
Magnesiumas Magnesium Oxideelemental482.6 mg121%Magnesium in Magnesium Oxide 400 against 14,003 products482.6 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg482.6 mg

Higher than 96% of 14,003 products listing magnesium (median 86 mg). 1.4 times the adult UL a day.

Source: NIH ODS Dietary Supplement Label Database, label 316128 (entered October 24, 2024), 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:

  • At 1 serving a day, the most its directions give, the label lists 482.6 mg of magnesium, 1.4 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: For adults, take two (2) tablets daily with food or as directed by a physician.
Warnings
Tamper evident: Do not use this product if imprinted foil seal under cap is broken or missing.
Keep out of reach of children.
Caution: If you are pregnant, nursing, have kidney disease or are taking prescription medications, consult your physician before taking this product.
Allergens and what it does not contain
Non-GMO Gluten free
Sugar free
Storage
Keep tightly closed. Store at room temperature: 59 degrees - 86 degrees F (15 degrees to 30 degrees C).

Source: label statements in DSLD label 316128.

What else is on the label?

Other ingredients: Cellulose, Stearic Acid, Magnesium Stearate, Silica.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): FDA Registered Facility Certified GMP Good Manufacturing Practice USA Made.

How many labels does Magnesium Oxide 400 have?

7 labels are on file under this name since November 19, 2021: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 316128 (current) Entered October 24, 2024 · on the market · 120 tablets · UPC 0 99528 68012 2
  2. Label 316129 Entered September 25, 2024 · on the market · 250 tablets · UPC 0 99528 68025 2
  3. Label 262919 Entered January 22, 2022 · on the market · 250 tablets · UPC X000QNWZ3H
  4. Label 262974 Entered December 18, 2021 · off the market October 24, 2022 · 250 tablets · UPC 0 99528 68025 2
  5. Label 261002 Entered November 19, 2021 · on the market · 250 tablets · UPC 0 99528 68025 2
  6. Label 260941 Entered November 19, 2021 · off the market October 24, 2022 · 120 tablets · UPC 0 99528 68012 2
  7. Label 256194 Entered November 19, 2021 · on the market · 250 tablets · UPC X000QNWZ3H

DSLD also links this label to: Magnesium Oxide 400 mg (image difference, same product), Magnesium Oxide 400 mg (package size difference, same product), Magnesium Oxide 400 mg (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 Wonder Labs (distributor), White House, TN. All Wonder Labs products.

Where next?