Label arithmetic · NIH DSLD 15764
Genesis Products Magnesium-Oxide: 241 mg of magnesium per tablet, 1 tablet a day
241 mg of magnesium per tablet, 1 a day. No US price matched (Nov 2). Inside: salt weight, %DV check.
Genesis Products Magnesium-Oxide declares 241 mg of elemental magnesium per serving as oxide, which means 400 mg of magnesium oxide pressed into 1 tablet, compared with 1,100 mg in the largest standard capsule; capsule verdicts do not apply to a tablet. No US retail price matched as of 2026-11-02; 10 of the 61 oxide labels in this registry have a matched price. NIH DSLD 15764, label dated 2012-11-21.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| gluconate |
| 4,118 |
| orotate |
| 3,319 |
| L-threonate |
| 2,925 |
| taurate |
| 2,705 |
| lactate |
| 2,009 |
| glycerophosphate |
| 1,930 |
| glycinate |
| 1,711 |
| malate |
| 1,553 |
| aspartate |
| 1,543 |
| citrate |
| 1,493 |
| sulfate |
| 1,195 |
| chloride |
| 945 |
| carbonate |
| 837 |
| hydroxide |
| 579 |
| oxide |
| 400 |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 400 mg per tablet · Price: none matched · % DV: 60% vs 57%
Elemental: The magnesium itself; the rest of the compound weight is the partner molecule.
Compound: The whole salt, such as magnesium glycinate, that must physically fit in the capsule.
Size 000: The largest standard capsule, about 1,100 mg of powder at 0.8 g/mL, the top of the usual 0.6–0.8 range; size 00 holds about 730 mg and size 0 about 545 mg.
Recompute with your price
Enter the price you paid; the declared amount and servings of this label are prefilled, so the result is the cost per 100 mg of elemental magnesium for your bottle.
Same-salt comparison appears here.
How much oxide is pressed into one tablet?
Genesis Products Magnesium-Oxide carries 400 mg of magnesium oxide per serving for 241 mg of elemental magnesium, against 1,100 mg in the largest standard capsule; capsule capacities do not apply to this tablet or pill.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 241 mg |
| Units per serving | 1 |
| Magnesium oxide per serving | 400 mg |
| Magnesium oxide per tablet | 400 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Capsule sizes do not apply |
Source · NIH DSLD 15764 · label 2012-11-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does the label's own text add up on magnesium?
The label's own text says “MAGNESIUM OXIDE 400 MG 241.3 mg Elemental Magnesium”: 241 mg of magnesium from 400 mg of magnesium oxide is 60.3% magnesium, against the 60.3–60.3% that magnesium oxide can carry, so the label's numbers agree with its salt.
computed| Measure | Value |
|---|---|
| Label text (NIH DSLD statements) | MAGNESIUM OXIDE 400 MG 241.3 mg Elemental Magnesium |
| Implied magnesium share | 60.3% |
| Most magnesium oxide can carry | 60.3% |
Source · NIH DSLD 15764 label text · snapshot 2026-08-10; salt fractions from the chemistry model · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Genesis Products Magnesium-Oxide files 1 magnesium line in NIH DSLD 15764; the selected primary line declares 241 mg of elemental magnesium per serving, against 0 other rows excluded from the primary amount. A salt named under another nutrient does not turn that nutrient's quantity into elemental magnesium.
measured| Filed amount | Salt or note as filed | Role |
|---|---|---|
| 241 mg | oxide · Magnesium (Form: as Magnesium Oxide) | Primary serving |
Source · NIH DSLD 15764 · label 2012-11-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's oxide claim hold up, or could the magnesium come from another source?
The label names one magnesium form, oxide, resolved from the filed magnesium line; capsule capacities do not apply to this form, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| Magnesium oxide | 60.3% | filed magnesium line |
Source · NIH DSLD 15764 · label 2012-11-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
No US retail price is matched to this label as of 2026-11-02; 10 of 61 oxide labels have one, against a median of $0.0293 per 100 mg among 5 ranked oxide offers.
computed
Chart data
| Displayed chart text |
|---|
| n=5 |
| P25 $0.0258 |
| P75 $0.0356 |
| median $0.0293 |
| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 1 | Nutricost Magnesium Oxide | $0.0148 | 2026-11-02 |
| 2 | tnvitamins Magnesium Oxide 420 mg | $0.0258 | 2026-11-02 |
| 3 | Douglas Laboratories Magnesium Oxide | $0.0293 | 2026-11-02 |
| 4 | Wonder Labs Magnesium Oxide 400 | $0.0356 | 2026-11-02 |
| 5 | Carlson Magnesium Gels 400 mg | $0.0636 | 2026-11-02 |
| Median | 5 ranked oxide offers | $0.0293 | 2026-11-02 |
Source · Amazon via licensed data provider; NIH DSLD · unique ASIN × date; prices observed 2026-10-26 to 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method
How many days will this bottle last at the label's own serving, and what does a day cost?
Days per bottle cannot be computed for Genesis Products Magnesium-Oxide as of 2026-11-02: servings per container are not filed.
computed| Measure | Value |
|---|---|
| Net contents as filed | 120 Tablet(s) |
| Serving size as filed | 1 Tablet(s) |
| Servings per container | Not filed as of 2026-11-02 |
| Servings per day in the directions | 1 |
| Days per bottle | Not computable as of 2026-11-02 |
| $ per 30 days at one label serving a day | No ranked price as of 2026-11-02 |
| $ per 30 days at 420 mg Daily Value | No ranked price as of 2026-11-02 |
Source · NIH DSLD 15764 · label 2012-11-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "60% Daily Value" mean here, and does it recompute?
The label declares 60% Daily Value; 241 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 57%, a difference of 3 points. Labels filed under the earlier 400 mg reference, or with a different filing basis, show gaps of this kind.
computed
Chart data
| Displayed chart text |
|---|
| Declared vs recomputed % |
| DV |
| 57 · 60 |
| Declared vs |
| recomputed % DV |
| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 60% | 420 mg | 57% |
Source · NIH DSLD 15764; 21 CFR 101.9 · label 2012-11-21 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Genesis Products Magnesium-Oxide files 4 other ingredients, including magnesium stearate (reference fraction 4.1% magnesium; no quantity filed, so it is not added to the total) and a vegetarian shell, against 30 of 61 oxide labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Microcrystalline Cellulose |
| 2 | Corn Starch |
| 3 | Talc |
| 4 | Magnesium Stearate |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
Source · NIH DSLD 15764 · label 2012-11-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about oxide, and about side effects?
12 studies in the PubMed-checked registry measured outcomes involving oxide; 2 mention gastrointestinal or adverse outcomes. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2026 | Randomized, open-label study of the short-term pharmacokinetics of oral magnesium oxide in healthy volunteers. | 42091979 |
| 2024 | Comparative Clinical Study on Magnesium Absorption and Side Effects After Oral Intake of Microencapsulated Magnesium (MAGSHAPE™ Microcapsules) Versus Other Magnesium Sources. | 39770988 |
| 2022 | Effects of short-term magnesium supplementation on ionized, total magnesium and other relevant electrolytes levels. | 35041150 |
Source · PubMed-checked study registry · registry checked 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Has this brand had FDA recalls or adverse event reports?
Genesis Products has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Genesis Products has no FDA CAERS adverse event report on record at brand level as of 2026-10-19 (143 of 273 brands in this registry have at least one CAERS report).
measured| Recall | Date | Reason | Status |
|---|---|---|---|
| No recall record as of 2026-10-19 |
Source · openFDA enforcement and CAERS · queried 2026-10-19 · release 2026-08-10-f441aa9f · CSV · method
Is this the same formula as another brand's, and how do their prices differ?
No other brand files the same formulation (ingredients, shell, units and rounded amount) as of 2026-11-02.
computed| Label | Brand | Price per 100 mg |
|---|---|---|
| No cross-brand match as of 2026-11-02 |
Source · NIH DSLD 15764 · label 2012-11-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
6 labels use the same resolved oxide within ±10% of this label's 241 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| Rising MAGnesium-Oxide | 241 mg | No price | Capsule sizes do not apply |
| Wonder Labs Magnesium Oxide 400 (DSLD 261002) | 241 mg | $21.49 · 2026-11-02 | Capsule sizes do not apply |
| Wonder Labs Magnesium Oxide 400 (DSLD 262919) | 241 mg | $21.49 · 2026-11-02 | Capsule sizes do not apply |
| Wonder Labs Magnesium Oxide 400 (DSLD 316129) | 241 mg | $21.49 · 2026-11-02 | Capsule sizes do not apply |
| Graxcell Pharmaceutical, LLC. Magnesium Oxide 400 mg | 242 mg | No price | Capsule sizes do not apply |
| Foods Plus Magnesium 400 | 240 mg | No price | Capsule sizes do not apply |
Source · NIH DSLD 15764 · label 2012-11-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Where does this record come from, what is missing, and how do I cite or correct it?
Every value on this page traces to NIH DSLD 15764 (label 2012-11-21, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 2 gaps remain: No US retail price matched as of 2026-11-02 (barcode 7 68585 00612 0); Servings per container are not filed as of 2026-11-02. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 15764 |
| Label date | 2012-11-21 |
| Date entered into DSLD | 2012-11-21 |
| Barcode (UPC) as filed | 7 68585 00612 0 |
| Distributed by | Genesis Products, Div. of Rising Pharmaceuticals, Inc., Paramus, NJ |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Storage | Store in a dry location at 59(0)to 86(0)F (15(0)to 30(0)C). |
19 additional rows
| Field | As filed |
|---|---|
| Brand IP Statement(s) re: (c), (TM), (SM) | *This product is not manufactured or distributed by Blaine Co., Inc., owners of the registered trademark MAG-OX 400(R). |
| Precautions re: All Other | Important: Do not use if printed foil inner seal is broken or missing. |
| Precautions re: Children | Keep out of the reach of children. |
| Suggested/Recommended/Usage/Directions | Close cap tightly after each use. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Drug Interaction Precaution: This product may interact with certain prescription drugs. If you are presently taking a prescription drug, do not take this product without checking with your physician or other health professional. |
| Brand IP Statement(s) re: (c), (TM), (SM) | Compare to active ingredient of MAG-OX 400(R)* |
| Formula re: Contains | MAGNESIUM OXIDE 400 MG 241.3 mg Elemental Magnesium 19.86 mEq |
| FDA Statement of Identity | Magnesium Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Directions: Take 1 tablet daily or as directed by a physician. |
| Precautions re: All Other | Warning: Not recommended for use in amounts over the recommended daily intake of 400 mg per day (1 tablet). |
| Precautions re: Pregnant or Nursing or Prescription Medications | Consult a physician before using this product if you have a kidney disease, or are pregnant or nursing a baby. |
| Precautions re: All Other | May have a laxative effect. |
| Formula re: Contains | MAGNESIUM OXIDE 400 MG |
| Formula re: Contains | Each Tablet Contains: Magnesium Oxide, 400 mg (241.3 mg. elemental magnesium (19.86 mEq). |
| General Statements: All Other Content | LOT # |
| FDA Statement of Identity | A Dietary Supplement |
| Seals/Symbols | GP Inc. |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 15764 · label 2012-11-21; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
6 brand pages linked below contain magnesium labels from the NIH DSLD registry snapshot dated 2026-08-10.