Label arithmetic · NIH DSLD 184671
Pure Encapsulations Magnesium (Citrate/Malate): 120 mg of magnesium per capsule, 1–4 capsules a day – citrate + malate
120 mg of magnesium per capsule; the label's 1–4 capsules a day give 120–480 mg. From citrate + malate. Inside: label lines, ingredients.
Pure Encapsulations Magnesium (Citrate/Malate) declares 120 mg of elemental magnesium per 1–4 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 184671, label dated 2019-01-07.
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: 29% vs 29%
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 120 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 120 mg of magnesium per serving came from magnesium citrate (16.2% magnesium), the richest of the 2 forms named for magnesium on the label, each of the 4 capsules (the most the serving allows) would need at least 186 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 mix of forms may need more.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 120 mg |
| Units per serving | 1–4 |
| 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 184671 · label 2019-01-07; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Pure Encapsulations Magnesium (Citrate/Malate) files 1 magnesium line in NIH DSLD 184671; the selected primary line declares 120 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 |
|---|---|---|
| 120 mg | citrate, malate · Magnesium (Form: as Magnesium Citrate, Magnesium Malate) | Primary serving |
Source · NIH DSLD 184671 · label 2019-01-07; 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?
The label names 2 magnesium forms (citrate, malate); a named blend does not establish how much magnesium each form contributes, so the resolved reading is the most favourable one, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| Magnesium citrate | 11.3–16.2% | named on label |
| Magnesium malate | 12.6–15.5% | named on label |
Source · NIH DSLD 184671 · label 2019-01-07; 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, Pure Encapsulations Magnesium (Citrate/Malate) lasts 90 days: 90 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 90 Capsule(s) |
| Serving size as filed | 1–4 Capsule(s) |
| Servings per container | 90 |
| Servings per day in the directions | 1 |
| Days per bottle | 90 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 184671 · label 2019-01-07; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "29% Daily Value" mean here, and does it recompute?
The label declares 29% Daily Value; 120 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 29%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 29% | 420 mg | 29% |
Source · NIH DSLD 184671; 21 CFR 101.9 · label 2019-01-07 · 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?
Pure Encapsulations Magnesium (Citrate/Malate) files 2 other ingredients and a vegetarian shell.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Vegetarian Capsule |
| 2 | Ascorbyl Palmitate |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
Source · NIH DSLD 184671 · label 2019-01-07; 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?
Pure Encapsulations has 2 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Pure Encapsulations 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-0396-2018 | 2017-12-06 | Product contains undeclared sulfites. | Terminated |
| F-0397-2018 | 2017-12-06 | Product contains undeclared sulfites. | 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 184671 · label 2019-01-07; 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 184671 · label 2019-01-07; 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 184671 (label 2019-01-07, 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 7 66298 00435 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 184671 |
| Label date | 2019-01-07 |
| Date entered into DSLD | 2019-01-07 |
| Barcode (UPC) as filed | 7 66298 00435 8 |
| Label version · Image difference, same product | NIH DSLD 93076 |
| Label version · Package size difference, same product | NIH DSLD 182998 |
| Label version · Package size difference, same product | NIH DSLD 184669 |
| Label version · Package size difference, same product | NIH DSLD 93076 |
26 additional rows
| Field | As filed |
|---|---|
| Label version · Package size difference, same product | NIH DSLD 294014 |
| Label version · Image difference, same product | NIH DSLD 219482 |
| Label version · Image difference, same product | NIH DSLD 185004 |
| Label version · Package size difference, same product | NIH DSLD 219484 |
| Label version · Package size difference, same product | NIH DSLD 219482 |
| Label version · Package size difference, same product | NIH DSLD 185004 |
| Manufactured by: | Pure Encapsulations, Sudbury, MA |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Storage | Store in a cool, dry place. |
| Suggested/Recommended/Usage/Directions | Recommendations: As a dietary supplement, take 1-4 capsules daily. Consume with food. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Warning: If you are pregnant or lactating, have any health condition or are taking any medication, consult your health professional before use. |
| Precautions re: Children | Keep out of the reach of children. |
| Precautions re: All Other | Use only if safety seal is intact. |
| General Statements: All Other Content | Contents may not fill package in order to accommodate required labeling. Please rely on stated quantity. |
| Formulation re: Does NOT Contain | Certified Gluten-Free by the Gluten-Free Certification Organization, www.gluten.org |
| General Statements: All Other Content | Scan to learn about our hypoallergenic supplements |
| General Statements: All Other Content | Supports cardiometabolic, neurocognitive and musculoskeletal health |
| Formulation re: Does NOT Contain | Gluten-free, Non-GMO & Hypoallergenic |
| Formulation re: Other | Gluten-free, Non-GMO & Hypoallergenic |
| FDA Statement of Identity | Dietary Supplement |
| Seals/Symbols | GF |
| 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. |
| General: Product/Version Code | v5 code: MCM9 |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 184671 · label 2019-01-07; 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.