Label arithmetic · NIH DSLD 203753
Swanson Magnesium Citrate 225 mg Super Strength: 225 mg of magnesium per tablet, 1–2 tablets a day
225 mg of magnesium per tablet; the label's 1–2 tablets a day give 225–450 mg. No US price matched (Nov 2). Inside: salt weight, %DV check.
Swanson Magnesium Citrate 225 mg Super Strength declares 225 mg of elemental magnesium per serving as citrate, which means 1,392–1,991 mg of magnesium citrate pressed into 1 tablet, compared with 1,100 mg in the largest standard capsule; capsule verdicts do not apply to a tablet. 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 203753, label dated 2019-06-24.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| gluconate |
| 3,840 |
| orotate |
| 3,095 |
| L-threonate |
| 2,727 |
| taurate |
| 2,522 |
| lactate |
| 1,873 |
| glycerophosphate |
| 1,800 |
| glycinate |
| 1,596 |
| malate |
| 1,448 |
| aspartate |
| 1,439 |
| citrate |
| 1,392 |
| sulfate |
| 1,114 |
| chloride |
| 881 |
| carbonate |
| 780 |
| hydroxide |
| 540 |
| oxide |
| 373 |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 1,392–1,991 mg per tablet · Price: none matched · % DV: 54% vs 54%
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.
How much citrate is pressed into one tablet?
Swanson Magnesium Citrate 225 mg Super Strength carries 1,392–1,991 mg of magnesium citrate per serving for 225 mg of elemental magnesium, against 1,100 mg in the largest standard capsule; capsule capacities do not apply to this tablet or pill.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 225 mg |
| Units per serving | 1 |
| Magnesium citrate per serving | 1,392–1,991 mg |
| Magnesium citrate per tablet | 1,392–1,991 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Capsule sizes do not apply |
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 203753 · label 2019-06-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Swanson Magnesium Citrate 225 mg Super Strength files 1 magnesium line in NIH DSLD 203753; the selected primary line declares 225 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 |
|---|---|---|
| 225 mg | citrate · Magnesium (Form: from Magnesium Citrate) | Primary serving |
Source · NIH DSLD 203753 · label 2019-06-24; 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 filed magnesium line; capsule capacities do not apply to this form, 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% | filed magnesium line |
Source · NIH DSLD 203753 · label 2019-06-24; 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; 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?
Days per bottle cannot be computed for Swanson Magnesium Citrate 225 mg Super Strength as of 2026-11-02: servings per container are not filed.
computed| Measure | Value |
|---|---|
| Net contents as filed | 120 Tablet(s) |
| Serving size as filed | 1 Tablet(s) |
| Servings per container | Not filed as of 2026-11-02 |
| Servings per day in the directions | 1–2 |
| 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 203753 · label 2019-06-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "54% Daily Value" mean here, and does it recompute?
The label declares 54% Daily Value; 225 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 54%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 54% | 420 mg | 54% |
Source · NIH DSLD 203753; 21 CFR 101.9 · label 2019-06-24 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Swanson Magnesium Citrate 225 mg Super Strength files 10 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 | Stearic Acid |
| 2 | Croscarmellose Sodium |
| 3 | Hydroxypropyl Methylcellulose |
| 4 | Titanium Dioxide |
| 5 | Silica |
| 6 | Magnesium Silicate |
| 7 | Triacetin |
| 8 | Magnesium Stearate |
4 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| 9 | Hydroxypropyl Cellulose |
| 10 | Carnauba Wax |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
Source · NIH DSLD 203753 · label 2019-06-24; 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?
Swanson has 6 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Swanson 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-0705-2013 | 2012-11-28 | This is to inform you of a product recall involving 2 lots of Swanson Organic 100% Certified Organic Fennel Seed (SWF092). Some jars of fennel seeds have been found to contain small, red beetle-type insects. | Terminated |
| F-0220-2014 | 2013-11-27 | Swanson Health Products is recalling two lots of Swanson Premium Full Spectrum Black Cumin Seed (Nigella sativa) Dietary Supplement Capsules. The product was found to be mislabel. Bottles of Black Cumin Seed from these two lots numbers (199399 & 201359) have been found to contain White Cumin Seed (Cuminum cyminum). | Terminated |
| F-1936-2014 | 2014-05-21 | The contract manufacturer has notified Swanson Health Products that Swanson Full Spectrum Cilantro (Coriander) (SW1112) is subject to a recall due to a potential risk of salmonella contamination. | Terminated |
| F-2438-2014 | 2014-09-24 | Swanson Certified Organic Carob Powder, item number SWF115 is being recalled due to a potential risk of Salmonella contamination from a raw ingredient used in this product. | Terminated |
| F-1985-2018 | 2018-10-03 | Himalayan Crystal Salt may contain metal wire pieces. | 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 203753 · label 2019-06-24; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
6 labels use the same resolved citrate within ±10% of this label's 225 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| Biotech Nutritions Magnesium Citrate | 225 mg | No price | Exceeds size 000 |
| Solgar Magnesium Citrate (DSLD 219453) | 210 mg | $15.29 · 2026-11-02 | Capsule sizes do not apply |
| Solgar Magnesium Citrate (DSLD 219466) | 210 mg | $15.29 · 2026-11-02 | Capsule sizes do not apply |
| Solgar Magnesium Citrate (DSLD 241135) | 210 mg | $15.29 · 2026-11-02 | Capsule sizes do not apply |
| Solgar Magnesium Citrate (DSLD 241141) | 210 mg | No price | Capsule sizes do not apply |
| Solgar Magnesium Citrate (DSLD 241142) | 210 mg | No price | Capsule sizes do not apply |
Source · NIH DSLD 203753 · label 2019-06-24; 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 203753 (label 2019-06-24, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 2 gaps remain: No US retail price matched as of 2026-11-02 (barcode 0 87614 02339 7); Servings per container are not filed as of 2026-11-02. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 203753 |
| Label date | 2019-06-24 |
| Date entered into DSLD | 2019-06-24 |
| Barcode (UPC) as filed | 0 87614 02339 7 |
| Label version · Image difference, same product | NIH DSLD 159707 |
| Label version · Image difference, same product | NIH DSLD 184900 |
| Label version · Image difference, same product | NIH DSLD 79148 |
| Label version · Image difference, same product | NIH DSLD 26658 |
16 additional rows
| Field | As filed |
|---|---|
| Label version · Image difference, same product | NIH DSLD 173336 |
| Distributed by | Swanson Health Products, Fargo, ND, USA |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| General Statements: All Other Content | Essential for strong muscles and bones, cardiovascular health and more Helps maintain healthy blood pressure and glucose levels Science-Backed Quality Since 1969 |
| Suggested/Recommended/Usage/Directions | Suggested use: As a dietary supplement, take one tablet one to two times per day with water. |
| Precautions re: All Other | Warning: For adults only. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Consult your physician before using this or any product 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 seal is broken. |
| Storage | 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. |
| General Statements: All Other Content | Muscle and bone health 225 mg per tablet |
| FDA Statement of Identity | Mineral Supplement |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 203753 · label 2019-06-24; 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.