Label arithmetic · NIH DSLD 263544
Graxcell Pharmaceutical, LLC. Magnesium Oxide 400 mg: 242 mg of magnesium per tablet, 1 tablet a day
242 mg of magnesium per tablet, 1 a day. No US price matched (Nov 2). Inside: salt weight, %DV check.
Graxcell Pharmaceutical, LLC. Magnesium Oxide 400 mg declares 242 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 263544, label dated 2021-12-18.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| gluconate |
| 4,121 |
| orotate |
| 3,322 |
| L-threonate |
| 2,927 |
| taurate |
| 2,707 |
| lactate |
| 2,011 |
| glycerophosphate |
| 1,932 |
| glycinate |
| 1,713 |
| malate |
| 1,554 |
| aspartate |
| 1,544 |
| citrate |
| 1,494 |
| sulfate |
| 1,196 |
| chloride |
| 946 |
| carbonate |
| 838 |
| 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?
Graxcell Pharmaceutical, LLC. Magnesium Oxide 400 mg carries 400 mg of magnesium oxide per serving for 242 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 | 242 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 263544 · label 2021-12-18; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Graxcell Pharmaceutical, LLC. Magnesium Oxide 400 mg files 1 magnesium line in NIH DSLD 263544; the selected primary line declares 242 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 |
|---|---|---|
| 242 mg | Salt not named in this row; magnesium oxide is taken from the label text | Primary serving |
Source · NIH DSLD 263544 · label 2021-12-18; 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 full NIH DSLD record text; 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% | full NIH DSLD record text |
Source · NIH DSLD 263544 · label 2021-12-18; 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?
At the label's own serving, Graxcell Pharmaceutical, LLC. Magnesium Oxide 400 mg lasts 120 days: 120 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 120 Tablet(s) |
| Serving size as filed | 1 Tablet(s) |
| Servings per container | 120 |
| Servings per day in the directions | 1 |
| Days per bottle | 120 days |
| $ 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 263544 · label 2021-12-18; 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; 242 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 263544; 21 CFR 101.9 · label 2021-12-18 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Graxcell Pharmaceutical, LLC. Magnesium Oxide 400 mg files 3 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 | Magnesium Stearate |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
Source · NIH DSLD 263544 · label 2021-12-18; 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?
Graxcell Pharmaceutical, LLC. has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Graxcell Pharmaceutical, LLC. 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 263544 · label 2021-12-18; 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 242 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| Genesis Products Magnesium-Oxide | 241 mg | No price | Capsule sizes do not apply |
| 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 |
| Foods Plus Magnesium 400 | 240 mg | No price | Capsule sizes do not apply |
Source · NIH DSLD 263544 · label 2021-12-18; 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 263544 (label 2021-12-18, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 1 gap remain: No US retail price matched as of 2026-11-02 (barcode 8 63298 00028 8). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 263544 |
| Scanned label (PDF) | Label 263544 scan |
| Label date | 2021-12-18 |
| Date entered into DSLD | 2021-12-18 |
| Barcode (UPC) as filed | 8 63298 00028 8 |
| Manufactured by | GRAXCELL Pharmaceutical, LLC., Syosset, NY |
| Distributed by | GRAXCELL Pharmaceutical, LLC., Bohemia, NY |
| Claim category as filed | Nutrient |
16 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| General Statements: All Other Content | NDC 70795-1151-2 |
| FDA Statement of Identity | Magnesium Supplement |
| Formula re: Contains | Essential mineral |
| Formulation re: Other | Uses: Helps maintain muscle and nerve function and normal heart rhythm & blood pressure. Helps absorption of calcium and potassium. |
| Precautions re: All Other | Drug interaction precautions: This product may interact with certain prescription drugs. If you are presently taking a prescription drug, do not take this product without consulting your doctor or other health professional. |
| Precautions re: All Other | Warnings: 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 doctor before using this product if you have kidney disease or are pregnant or nursing a baby. |
| Precautions re: All Other | May have a laxative effect. |
| Storage | Other information Store at room temperature Keep lid tightly closed in a dry place |
| Precautions re: Children | Keep out of reach of children |
| Precautions re: All Other | Do not use if imprinted safety seal under cap is broken or missing |
| Precautions re: Allergies | Ask a doctor or pharmacist before use if you have a known allergy to this product. Stop use and contact a doctor if allergic reaction occurs. |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 263544 · label 2021-12-18; 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.