Label arithmetic · NIH DSLD 273296
NFH Magnesium Citrate SAP: 136 mg of magnesium per capsule, 2 capsules a day
136 mg of magnesium per capsule; the label's 2 capsules a day give 272 mg. No US price matched (Nov 2). Inside: salt weight, capsule size.
NFH Magnesium Citrate SAP declares 136 mg of elemental magnesium per serving as citrate, which needs 842–1,204 mg of magnesium citrate in each capsule, 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: it fits only that size. No US retail price matched as of 2026-11-02; 17 of the 135 citrate labels in this registry have a matched price. NIH DSLD 273296, label dated 2023-01-23.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 842–1,204 mg of citrate per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 842–1,204 mg per capsule · Price: none matched · % DV: not declared
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 136 mg of citrate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: NFH Magnesium Citrate SAP implies 842–1,204 mg of magnesium citrate in each capsule to deliver 136 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: needs size 000, read at the most favourable hydration and the most units per serving.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 136 mg |
| Units per serving | 1 |
| Magnesium citrate per serving | 842–1,204 mg |
| Magnesium citrate per capsule | 842–1,204 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Needs size 000 |
The filed salt can have more than one hydration state (trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3%), so the compound mass is a range.
Source · NIH DSLD 273296 · label 2023-01-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
NFH Magnesium Citrate SAP files 1 magnesium line in NIH DSLD 273296; the selected primary line declares 136 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 |
|---|---|---|
| 136 mg | Salt not named in this row; magnesium citrate is taken from the label text | Primary serving |
Source · NIH DSLD 273296 · label 2023-01-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's citrate claim hold up, or could the magnesium come from another source?
The label names one magnesium form, citrate, 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 citrate | 11.3–16.2% | full NIH DSLD record text |
Source · NIH DSLD 273296 · label 2023-01-23; 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; 17 of 135 citrate labels have one, against a median of $0.1159 per 100 mg among 12 ranked citrate offers.
computed
Chart data
| Displayed chart text |
|---|
| n=12 |
| P25 $0.0843 |
| P75 $0.1469 |
| median $0.1159 |
| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 1 | Best Naturals Magnesium Citrate 200 mg | $0.0344 | 2026-11-02 |
| 2 | Solgar Magnesium Citrate | $0.0607 | 2026-11-02 |
| 3 | LES Labs Magnesium Citrate | $0.0777 | 2026-11-02 |
| 4 | Bluebonnet Magnesium Citrate | $0.0865 | 2026-11-02 |
| 5 | Solaray Magnesium Citrate 400 mg | $0.0868 | 2026-11-02 |
| Median | 12 ranked citrate offers | $0.1159 | 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, NFH Magnesium Citrate SAP lasts 45 days: 90 servings against 2 servings a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 90 Capsule(s) |
| Serving size as filed | 1 Capsule(s) |
| Servings per container | 90 |
| Servings per day in the directions | 2 |
| Days per bottle | 45 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 273296 · label 2023-01-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "percent Daily Value" mean here, and does it recompute?
The label does not declare a percent Daily Value for magnesium as of 2026-11-02.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| No declaration as of 2026-11-02 |
Source · NIH DSLD 273296; 21 CFR 101.9 · label 2023-01-23 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
NFH Magnesium Citrate SAP files 3 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 43 of 135 citrate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Magnesium Stearate |
| 2 | Hypromellose |
| 3 | Water, Purified |
| Shell | vegetarian |
| Target group | Children 4 or More Years of Age |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
| Target group | Dairy Free |
1 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Target group | Sugar Free |
Source · NIH DSLD 273296 · label 2023-01-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about citrate, and about side effects?
10 studies in the PubMed-checked registry measured outcomes involving citrate; 1 mention gastrointestinal or adverse outcomes. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2025 | Comparing the Bioavailability of Two Seawater-Derived Magnesium Preparations. | 40955524 |
| 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?
NFH has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. NFH 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 273296 · label 2023-01-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
6 labels use the same resolved citrate within ±10% of this label's 136 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| AN Amazing Nutrition Amazing Formulas Magnesium Citrate 400 mg | 133 mg | No price | Capsule sizes do not apply |
| Protocol For Life Balance Magnesium Citrate | 133 mg | No price | Capsule sizes do not apply |
| OL Olympian Labs Magnesium Citrate 400 mg (DSLD 326662) | 133 mg | No price | Needs size 000 |
| OL Olympian Labs Magnesium Citrate 400 mg (DSLD 326663) | 133 mg | No price | Needs size 000 |
| NOW Magnesium Citrate 400 mg | 133 mg | No price | Needs size 000 |
| Solaray Magnesium Citrate 400 mg | 133 mg | $20.84 · 2026-11-02 | Needs size 000 |
Source · NIH DSLD 273296 · label 2023-01-23; 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 273296 (label 2023-01-23, 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 8 56711 00191 7). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 273296 |
| Scanned label (PDF) | Label 273296 scan |
| Label date | 2023-01-23 |
| Date entered into DSLD | 2023-01-23 |
| Barcode (UPC) as filed | 8 56711 00191 7 |
| Manufacturer | NFH - Nutritional Fundamentals for Health, Inc., Vaudreuil, QC |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
16 additional rows
| Field | As filed |
|---|---|
| Claim category as filed | Structure/Function |
| Formulation re: Other | Magnesium Citrate SAP helps the body to metabolize carbohydrates, proteins, and fats. Magnesium Citrate SAP helps in the development and maintenance of bones and teeth. Magnesium Citrate SAP helps in tissue formation and to maintain proper muscle function. |
| Formulation re: Other | All ingredients listed for this product lot number have been tested by a third-party laboratory for identity, potency, and purity. |
| Suggested/Recommended/Usage/Directions | Directions for use: Adolescents 14-18 years and adults: Take 1 capsule twice daily or as directed by your healthcare practitioner. |
| Formulation re: Does NOT Contain | Contains no: Gluten, soy, wheat, corn, eggs, dairy, yeast, citrus, preservatives, artificial flavor or color, starch, or sugar. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Cautions and warnings: Consult a healthcare practitioner prior to use if you are pregnant or breast-feeding. |
| Precautions re: All Other | Do not use if seal is broken. |
| Precautions re: Children | Keep out of reach of children. |
| Formulation re: Other | Color, size and smell may vary from one lot to another. |
| 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. |
| Formula re: Contains | Magnesium Citrate SAP with L-taurine |
| FDA Statement of Identity | Dietary Supplement |
| Formulation re: Other | Made in Canada |
| General Statements: All Other Content | NPN 80050353 |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 273296 · label 2023-01-23; 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.