Label arithmetic · NIH DSLD 270606
Nutricost Magnesium Oxide 375 mg: 210 mg of magnesium per capsule, 1 capsule a day, $1.87 a month
210 mg of magnesium per capsule; the label's 1 capsule a day cost $1.87 a month (Amazon, Nov 2). Inside: salt weight, capsule size, price rank.
Nutricost Magnesium Oxide 375 mg was observed at $14.95 on 2026-11-02 for 240 servings of 210 mg elemental magnesium as oxide: $0.0297 per 100 mg, rank 1 of 5 ranked oxide offers (1 = lowest price per 100 mg), percentile 60 (lower = lower price) (median $0.0293, ranked prices observed 2026-10-26 to 2026-11-02). NIH DSLD 270606, label dated 2022-06-16.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 348 mg of oxide per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-11-02 · chemistry 2026-10-17
Mass: 348 mg per capsule · Price: $0.0297 per 100 mg · % DV: 50% vs 50%
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.
Will 210 mg of oxide actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: Nutricost Magnesium Oxide 375 mg implies 348 mg of magnesium oxide in each capsule to deliver 210 mg of elemental magnesium, against 1,100 mg in the largest standard capsule (size 000) at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range. Verdict: fits size 0, read at the most favourable hydration and the most units per serving.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 210 mg |
| Units per serving | 1 |
| Magnesium oxide per serving | 348 mg |
| Magnesium oxide per capsule | 348 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Fits size 0 |
Source · NIH DSLD 270606 · 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?
Nutricost Magnesium Oxide 375 mg files 1 magnesium line in NIH DSLD 270606; the selected primary line declares 210 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 |
|---|---|---|
| 210 mg | Salt not named in this row; magnesium oxide is taken from the label text | Primary serving |
Source · NIH DSLD 270606 · 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 full NIH DSLD record text; at that salt the declaration is within the assumed size 000 capacity at powder density 0.8 g/mL, 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 270606 · 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?
Nutricost Magnesium Oxide 375 mg costs $0.0297 per 100 mg of elemental magnesium at the price observed 2026-11-02, rank 1 of 5 ranked oxide offers (1 = lowest price per 100 mg), percentile 60 (lower = lower price), against a same-salt median of $0.0293; prices observed 2026-10-26 to 2026-11-02. First observed 2026-10-12 at $14.95, latest 2026-11-02 at $14.95, 3 observations.
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, Nutricost Magnesium Oxide 375 mg lasts 240 days: 240 servings against 1 serving a day in the filed directions. $1.87 a month at the label's suggested use (1 capsule a day) and $3.74 at the 420 mg Daily Value reference (21 CFR 101.9); arithmetic on the label, not intake advice.
computed| Measure | Value |
|---|---|
| Net contents as filed | 240 Capsule(s) |
| Serving size as filed | 1 Capsule(s) |
| Servings per container | 240 |
| Servings per day in the directions | 1 |
| Days per bottle | 240 days |
| Cost a month at the label suggested use | $1.87 a month at the label's suggested use (1 capsule a day) |
| $ per 30 days at 420 mg Daily Value | $3.74 |
Source · NIH DSLD 270606 · label 2022-06-16; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "50% Daily Value" mean here, and does it recompute?
The label declares 50% Daily Value; 210 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 50%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 50% | 420 mg | 50% |
Source · NIH DSLD 270606; 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?
Nutricost Magnesium Oxide 375 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 | Capsule |
| 2 | Microcrystalline Cellulose |
| 3 | Vegetable Magnesium Stearate |
| 4 | Silicon Dioxide |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
Source · NIH DSLD 270606 · 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?
Nutricost has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Nutricost 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 270606 · 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?
3 labels use the same resolved oxide within ±10% of this label's 210 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| Douglas Laboratories MgO2 (Magnesium Caps) (DSLD 10307) | 215 mg | No price | Fits size 0 |
| Douglas Laboratories MgO2 (Magnesium Caps) (DSLD 10308) | 215 mg | No price | Fits size 0 |
| Swanson Magnesium 200 mg | 200 mg | No price | Fits size 0 |
Source · NIH DSLD 270606 · 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 270606 (label 2022-06-16, snapshot 2026-08-10), a price observed 2026-11-02 and the chemistry model of 2026-09-13. No data gap remains for the computed fields. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 270606 |
| Scanned label (PDF) | Label 270606 scan |
| Label date | 2022-06-16 |
| Date entered into DSLD | 2022-06-16 |
| Barcode (UPC) as filed | 8 57077 00805 3 |
| Distributed by | Nutricost, Vineyard, UT |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
15 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | Structure/Function |
| Suggested/Recommended/Usage/Directions | Recommended Use: As a dietary supplement, take 1 capsule daily with 8-12 oz of water or as directed by your physician. |
| Precautions re: All Other | Warning: For healthy individuals 18 years and older. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Consult a healthcare professional prior to use if you are pregnant or nursing, taking medication, or have a medical condition. |
| Precautions re: Children | Keep out of reach of children. |
| Precautions re: All Other | Do not use if safety seal is broken or missing. |
| Storage | Notice: Store in a cool, dry place. |
| FDA Disclaimer Statement | These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. |
| FDA Statement of Identity | Dietary Supplement |
| Seals/Symbols | Quality Guaranteed Nutricost |
| Formulation re: Other | Third Party Tested |
| Formulation re: Does NOT Contain | Non-GMO Gluten-Free |
| Formula re: Contains | 375 mg magnesium oxide per serving |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 270606 · 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.