Label arithmetic · NIH DSLD 327567
MegaFood Magnesium 300 mg: 150 mg of magnesium per capsule, 2 capsules a day (salt not resolved)
150 mg of magnesium per capsule; the label's 2 capsules a day give 300 mg. Salt not resolved from the NIH record. Inside: label lines, ingredients.
MegaFood Magnesium 300 mg declares 300 mg of elemental magnesium per 2 capsule(s); the magnesium salt is not resolved from the filed record, Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved., as of 2026-11-02. No US retail price matched as of 2026-11-02. NIH DSLD 327567, label dated 2025-04-24.
as filedData release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: not computable · Price: none matched · % DV: 71% vs 71%
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 300 mg of magnesium actually fit in one capsule, or do I need more than one?
The compound mass behind this label cannot be computed as of 2026-11-02: Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved.. The filed amounts are listed in the next block. Lower bound, not a measurement: even if all 300 mg of magnesium per serving came from magnesium oxide (60.3% magnesium), the richest magnesium salt used in supplements, because the label names no form, each of the 2 capsules would need at least 249 mg of compound, so at this bound it needs at least a size 0 capsule (about 545 mg at 0.8 g/mL); the actual form, which the label does not name, may need more.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 300 mg |
| Units per serving | 2 |
| Magnesium salt per serving | Not computable as of 2026-11-02 |
| Magnesium salt per capsule | Not computable as of 2026-11-02 |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Not computable as of 2026-11-02 |
Source · NIH DSLD 327567 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
MegaFood Magnesium 300 mg files 1 magnesium line in NIH DSLD 327567; the selected primary line declares 300 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 |
|---|---|---|
| 300 mg | Salt not named in this row as of 2026-11-02 | Primary serving |
Source · NIH DSLD 327567 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's magnesium claim hold up, or could the magnesium come from another source?
No single magnesium salt is resolved from the filed record as of 2026-11-02, so the source of the declared magnesium cannot be checked against capsule capacity, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| No form named as of 2026-11-02 | No defined fraction | named on label |
Source · NIH DSLD 327567 · label 2025-04-24; 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, and without a resolved salt there is no same-salt comparison.
computed| Rank | Label | Per 100 mg | Observed |
|---|
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 MegaFood Magnesium 300 mg as of 2026-11-02: the filed directions give no complete daily frequency.
computed| Measure | Value |
|---|---|
| Net contents as filed | 60 Capsule(s) |
| Serving size as filed | 2 Capsule(s) |
| Servings per container | 30 |
| 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 327567 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "71% Daily Value" mean here, and does it recompute?
The label declares 71% Daily Value; 300 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 71%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 71% | 420 mg | 71% |
Source · NIH DSLD 327567; 21 CFR 101.9 · label 2025-04-24 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain these other ingredients, what shell is it, and who is it filed for?
MegaFood Magnesium 300 mg files 3 other ingredients and a vegetarian shell.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Hypromellose |
| 2 | Ascorbyl Palmitate |
| 3 | Rice Husk Concentrate |
| Shell | vegetarian |
| Target group | Vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | No Allergies |
| Target group | Gluten Free |
1 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Target group | Dairy Free |
Source · NIH DSLD 327567 · label 2025-04-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about this form, and about side effects?
No study in the registry measured an unresolved salt as of 2026-11-02.
measured| Year | Study | PubMed |
|---|
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?
MegaFood has 4 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. MegaFood 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 |
|---|---|---|---|
| F-1133-2014 | 2014-01-01 | Potential for Chloramphenicol contamination. | Terminated |
| F-1134-2014 | 2014-01-01 | Potential for Chloramphenicol contamination. | Terminated |
| F-1132-2014 | 2014-01-01 | Potential for Chloramphenicol contamination. | Terminated |
| F-1362-2016 | 2016-05-25 | Multi Vitamin label fails to have required warning statement for iron and child resistant cap | Terminated |
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 327567 · label 2025-04-24; 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 327567 · label 2025-04-24; 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 327567 (label 2025-04-24, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 3 gaps remain: Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved.; No US retail price matched as of 2026-11-02 (barcode 0 51494 10396 8); A single salt with a defined elemental fraction is unresolved as of 2026-11-02. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 327567 |
| Scanned label (PDF) | Label 327567 scan |
| Label date | 2025-04-24 |
| Date entered into DSLD | 2025-04-24 |
| Barcode (UPC) as filed | 0 51494 10396 8 |
| Made for | MegaFood, Manchester, NH, USA |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
20 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | Structure/Function |
| General Statements: All Other Content | Learn about our seals: megafood.com/standards |
| Formulation re: Does NOT Contain | Made without milk, eggs, peanuts, tree nuts, soy, wheat, fish, shellfish and sesame. |
| Seals/Symbols | Tested 125+ Pesticides Herbicides Glyphosate Residue free detoxproject.org Vegetarian Certified B Corporation |
| Formulation re: Does NOT Contain | Tested 125+ Pesticides Herbicides Glyphosate Residue free detoxproject.org Made without 9 Food Allergens Gluten Free |
| Formulation re: Vegetarian/Vegan | Vegetarian |
| 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. |
| Formula re: Contains | Citrate, Malate, Glycinate |
| Formulation re: Other | An essential mineral for muscle relaxation |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Suggested Use: Adults take 2 capsules any time of day with food and a beverage. |
| Formula re: Contains | MegaFood Magnesium 300 contains three synergistic forms of magnesium to help support a healthy heart, nervous system, and muscle relaxation. |
| Formulation re: Other | Formulated to be gentle and effective. |
| Formulation re: Other | Satisfaction guaranteed or your money back. |
| 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. |
| Precautions re: Children | Keep out of reach of children. |
| Storage | Store tightly sealed in a cool place and avoid exposure to moisture. |
| Suggested/Recommended/Usage/Directions | Once open, consume within three months. |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 327567 · label 2025-04-24; 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.