Label arithmetic · NIH DSLD 333758
Nature's Way Magnesium Complex 500 mg: 250 mg of magnesium per capsule, 2 capsules a day
250 mg of magnesium per capsule; the label's 2 capsules a day give 500 mg. No US price matched (Nov 2). Inside: label lines, ingredients.
Nature's Way Magnesium Complex 500 mg declares 500 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: buffered, complex, blend or asporotate wording leaves the composition unresolved., as of 2026-11-02. No US retail price matched as of 2026-11-02. NIH DSLD 333758, label dated 2025-06-25.
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: 119% vs 119%
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 500 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: buffered, complex, blend or asporotate wording leaves the composition unresolved.. The filed amounts are listed in the next block. Lower bound, not a measurement: even if all 500 mg of magnesium per serving came from magnesium oxide (60.3% magnesium), the richest magnesium salt used in supplements, because the complex or buffer does not specify every carrier, each of the 2 capsules would need at least 414 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 | 500 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 333758 · label 2025-06-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Nature's Way Magnesium Complex 500 mg files 1 magnesium line in NIH DSLD 333758; the selected primary line declares 500 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 |
|---|---|---|
| 500 mg | Salt not named in this row as of 2026-11-02 | Primary serving |
Source · NIH DSLD 333758 · label 2025-06-25; 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 333758 · label 2025-06-25; 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?
At the label's own serving, Nature's Way Magnesium Complex 500 mg lasts 50 days: 50 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 100 Capsule(s) |
| Serving size as filed | 2 Capsule(s) |
| Servings per container | 50 |
| Servings per day in the directions | 1 |
| Days per bottle | 50 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 333758 · label 2025-06-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "119% Daily Value" mean here, and does it recompute?
The label declares 119% Daily Value; 500 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 119%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 119% | 420 mg | 119% |
Source · NIH DSLD 333758; 21 CFR 101.9 · label 2025-06-25 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Nature's Way Magnesium Complex 500 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 gelatin shell.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Gelatin |
| 2 | Cellulose |
| 3 | Magnesium Stearate |
| 4 | Silica |
| Shell | gelatin |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
| Target group | Dairy Free |
Source · NIH DSLD 333758 · label 2025-06-25; 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?
Nature's Way has 9 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Nature's Way 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-0837-2014 | 2013-12-25 | Nature's Way (NW) is voluntary recalling a number of products because the raw material supplier informed them that enzymes in the blend they provided to NW may contain the antibiotic chloramphenicol. | Terminated |
| F-0838-2014 | 2013-12-25 | Nature's Way (NW) is voluntary recalling a number of products because the raw material supplier informed them that enzymes in the blend they provided to NW may contain the antibiotic chloramphenicol. | Terminated |
| F-0833-2014 | 2013-12-25 | Nature's Way (NW) is voluntary recalling a number of products because the raw material supplier informed them that enzymes in the blend they provided to NW may contain the antibiotic chloramphenicol. | Terminated |
| F-0835-2014 | 2013-12-25 | Nature's Way (NW) is voluntary recalling a number of products because the raw material supplier informed them that enzymes in the blend they provided to NW may contain the antibiotic chloramphenicol. | Terminated |
| F-0831-2014 | 2013-12-25 | Nature's Way (NW) is voluntary recalling a number of products because the raw material supplier informed them that enzymes in the blend they provided to NW may contain the antibiotic chloramphenicol. | 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 333758 · label 2025-06-25; 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 333758 · label 2025-06-25; 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 333758 (label 2025-06-25, 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: buffered, complex, blend or asporotate wording leaves the composition unresolved.; No US retail price matched as of 2026-11-02 (barcode 0 33674 41051 6); 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 333758 |
| Scanned label (PDF) | Label 333758 scan |
| Label date | 2025-06-25 |
| Date entered into DSLD | 2025-06-25 |
| Barcode (UPC) as filed | 0 33674 41051 6 |
| Label version · Image difference, same product | NIH DSLD 40573 |
| Label version · Image difference, same product | NIH DSLD 251628 |
| Label version · Image difference, same product | NIH DSLD 62258 |
20 additional rows
| Field | As filed |
|---|---|
| Manufacturer | Nature's Way Brands, LLC, Green Bay, WI, USA |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Formulation re: Other | Supports muscle relaxation Promotes a sense of calm Supports a healthy response to stress Replenishes stress-depleted magnesium levels. |
| Formula re: Contains | High potency formula with two forms of magnesium |
| General Statements: All Other Content | Explore more products at naturesway.com Bottle made from 50% post-consumer recycled plastic |
| Formulation re: Does NOT Contain | Gluten free. No wheat, corn, soy, dairy, or artificial colors, or flavors. |
| Brand IP Statement(s) re: (c), (TM), (SM) | Copyright 2023 Nature's Way Brands, LLC |
| FDA Disclaimer Statement | These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. |
| Formulation re: Other | High potency Supports muscle relaxation & function |
| Formula re: Contains | Magnesium Complex 500 mg per 2-capsule serving |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Recommendation: Adults take 2 capsules daily, preferably with food. |
| Precautions re: Pregnant or Nursing or Prescription Medications | If you are pregnant, nursing, or taking any medications, consult a healthcare professional before use. |
| Precautions re: Children | Keep out of reach of children. |
| Precautions re: All Other | Safety sealed with inner seal. Do not use if seal is broken or missing. |
| Storage | Keep tightly closed. Store at room temperature. Avoid excessive heat and direct sunlight. |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 333758 · label 2025-06-25; 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.