Label arithmetic · NIH DSLD 267034
DC Magnesium Oxide 400 mg: 241 mg of magnesium per tablet, 1–2 tablets a day
241 mg of magnesium per tablet; the label's 1–2 tablets a day give 241–483 mg. No US price matched (Nov 2). Inside: salt weight, %DV check.
DC Magnesium Oxide 400 mg declares 241 mg of elemental magnesium per serving as oxide, which means 400 mg of magnesium oxide pressed into 1–2 tablets, 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 267034, label dated 2022-06-16.
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: 200 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?
DC Magnesium Oxide 400 mg 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 | 1–2 |
| Magnesium oxide per serving | 400 mg |
| Magnesium oxide per tablet | 200 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Capsule sizes do not apply |
Source · NIH DSLD 267034 · label 2022-06-16; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
DC Magnesium Oxide 400 mg files 1 magnesium line in NIH DSLD 267034; 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: Elemental Magnesium, from 400 mg Magnesium Oxide) | Primary serving |
Source · NIH DSLD 267034 · label 2022-06-16; 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 267034 · label 2022-06-16; 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, DC 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 | 1–2 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 267034 · label 2022-06-16; 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 267034; 21 CFR 101.9 · label 2022-06-16 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
DC Magnesium Oxide 400 mg 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 | Veg. Cellulose |
| 2 | Stearic Acid |
| 3 | Veg. Magnesium Stearate |
| 4 | Silica |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
Source · NIH DSLD 267034 · label 2022-06-16; 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?
DC has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. DC has FDA CAERS adverse event reports on record at brand level, as do 143 of 273 brands in this registry; openFDA states that “there is no certainty that the reported event (adverse event) was actually due to the product” and that reports “cannot be used to estimate the incidence of these events.”
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 267034 · label 2022-06-16; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
No other label files the same resolved salt within ±10% of this label's dose per unit as of 2026-11-02.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| No neighbour as of 2026-11-02 |
Source · NIH DSLD 267034 · label 2022-06-16; 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 267034 (label 2022-06-16, 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 0 52301 68012 2). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 267034 |
| Scanned label (PDF) | Label 267034 scan |
| Label date | 2022-06-16 |
| Date entered into DSLD | 2022-06-16 |
| Barcode (UPC) as filed | 0 52301 68012 2 |
| Label version · Image difference, same product | NIH DSLD 245142 |
| Label version · Image difference, same product | NIH DSLD 265890 |
| Label version · Image difference, same product | NIH DSLD 265891 |
19 additional rows
| Field | As filed |
|---|---|
| Mfg. by | Dee Cee Laboratories, Inc., White House, TN |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Precautions re: All Other | Tamper Evident: Do not use this product if imprinted foil seal under cap is broken or missing. |
| Formulation re: Other | FDA Registered Facility (Reg. #1023013) |
| Storage | Keep tightly closed. Store at room temperature: 59 degrees - 86 degrees F (15 degrees to 30 degrees C). |
| Precautions re: Children | Keep out of reach of children. |
| Formulation re: Other | Conforms to USP <2091> for weight. Meets USP <2040> disintegration for maximum bioavailability. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Caution: If you are pregnant, nursing, have kidney disease or are taking prescription medication, consult your physician before taking this product. |
| FDA Disclaimer Statement | This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. |
| Formulation re: Other | Now coated, easier to swallow |
| Formulation re: Does NOT Contain | Gluten free |
| Seals/Symbols | Quali Pure |
| Formulation re: Other | Promotes bone mineralization and cardiovascular health |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Directions: As an adult dietary supplement, take 1 or 2 tablets daily. |
| Formulation re: Other | Made in USA |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 267034 · label 2022-06-16; 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.