Label arithmetic · NIH DSLD 338474
Solaray Magnesium Citrate 400 mg: 133 mg of magnesium per capsule, 3 capsules a day, $10.42 a month
133 mg of magnesium per capsule; the label's 3 capsules a day cost $10.42 a month (Amazon, Nov 2). Inside: salt weight, capsule size, price rank.
Solaray Magnesium Citrate 400 mg declares 400 mg of elemental magnesium per serving as citrate, which needs 825–1,180 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. Observed at $0.0868 per 100 mg, rank 5 of 12 ranked citrate offers (1 = lowest price per 100 mg), percentile 42 (lower = lower price). NIH DSLD 338474, label dated 2025-09-25.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 825–1,180 mg of citrate per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-11-02 · chemistry 2026-10-17
Mass: 825–1,180 mg per capsule · Price: $0.0868 per 100 mg · % DV: 95% vs 95%
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 400 mg of citrate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: Solaray Magnesium Citrate 400 mg implies 825–1,180 mg of magnesium citrate in each capsule to deliver 400 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 | 400 mg |
| Units per serving | 3 |
| Magnesium citrate per serving | 2,475–3,540 mg |
| Magnesium citrate per capsule | 825–1,180 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 338474 · label 2025-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Solaray Magnesium Citrate 400 mg files 1 magnesium line in NIH DSLD 338474; the selected primary line declares 400 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 |
|---|---|---|
| 400 mg | Salt not named in this row; magnesium citrate is taken from the label text | Primary serving |
Source · NIH DSLD 338474 · label 2025-09-25; 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 338474 · label 2025-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
Solaray Magnesium Citrate 400 mg costs $0.0868 per 100 mg of elemental magnesium at the price observed 2026-11-02, rank 5 of 12 ranked citrate offers (1 = lowest price per 100 mg), percentile 42 (lower = lower price), against a same-salt median of $0.1159; prices observed 2026-10-26 to 2026-11-02. First observed 2026-10-05 at $20.89, latest 2026-11-02 at $20.84, 5 observations.
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, Solaray Magnesium Citrate 400 mg lasts 60 days: 60 servings against 1 serving a day in the filed directions. $10.42 a month at the label's suggested use (3 capsules a day) and $10.94 at the 420 mg Daily Value reference (21 CFR 101.9); arithmetic on the label, not intake advice.
computed| Measure | Value |
|---|---|
| Net contents as filed | 180 VegCap(s) |
| Serving size as filed | 3 VegCap(s) |
| Servings per container | 60 |
| Servings per day in the directions | 1 |
| Days per bottle | 60 days |
| Cost a month at the label suggested use | $10.42 a month at the label's suggested use (3 capsules a day) |
| $ per 30 days at 420 mg Daily Value | $10.94 |
Source · NIH DSLD 338474 · label 2025-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "95% Daily Value" mean here, and does it recompute?
The label declares 95% Daily Value; 400 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 95%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 95% | 420 mg | 95% |
Source · NIH DSLD 338474; 21 CFR 101.9 · label 2025-09-25 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Solaray Magnesium Citrate 400 mg files 7 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 | Cellulose |
| 2 | Cellulose |
| 3 | Magnesium Stearate |
| 4 | Watercress |
| 5 | Dandelion |
| 6 | Alfalfa |
| 7 | Parsley |
| Shell | vegetarian |
4 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Target group | Vegan |
| Target group | Vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Dairy Free |
Source · NIH DSLD 338474 · label 2025-09-25; 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?
Solaray has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Solaray 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 338474 · label 2025-09-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
6 labels use the same resolved citrate within ±10% of this label's 133 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 |
| Source Naturals Magnesium Citrate 133 mg | 133 mg | No price | Needs size 000 |
Source · NIH DSLD 338474 · label 2025-09-25; 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 338474 (label 2025-09-25, snapshot 2026-08-10), a price observed 2026-11-02 and the chemistry model of 2026-09-13. No data gap remains for the computed fields. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 338474 |
| Scanned label (PDF) | Label 338474 scan |
| Label date | 2025-09-25 |
| Date entered into DSLD | 2025-09-25 |
| Barcode (UPC) as filed | 0 76280 37402 5 |
| Label version · Image difference, same product | NIH DSLD 326041 |
| Label version · Image difference, same product | NIH DSLD 296054 |
| Label version · Image difference, same product | NIH DSLD 258920 |
22 additional rows
| Field | As filed |
|---|---|
| Label version · Package size difference, same product | NIH DSLD 255515 |
| Manufacturer | Solaray, Salt Lake City, UT, USA |
| Manufactured by | Nutraceutical Corp., USA |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Brand IP Statement(s) re: (c), (TM), (SM) | Solaray Est. 1973 A Brighter Way 1973 |
| Formula re: Contains | Magnesium Citrate 400 mg per serving |
| Formulation re: Other | Bone health Muscle support |
| FDA Statement of Identity | Dietary Supplement |
| Seals/Symbols | Lab Verified Vegan |
| Formulation re: Vegetarian/Vegan | Vegan |
| General Statements: All Other Content | Since 1973, we've scoured the globe for the highest-quality ingredients, connecting you with the most efficacious supplements that help you live brighter and embrace the moments that matter most. |
| Precautions re: All Other | Warning: Do not use if safety seal is broken or missing. Keep your licensed health care practitioner informed when using this product. Directions: Use only as directed. |
| Precautions re: Children | Keep out of reach of children. |
| Suggested/Recommended/Usage/Directions | Directions: Use only as directed. Take 3 VegCaps daily, preferably with a meal. |
| Storage | Store in a cool, dry place. |
| Formula re: Contains | Discussion: Magnesium Citrate is a specially-chelated form of Magnesium using citric acid. It's formulated to help with mineral bioavailability. |
| FDA Disclaimer Statement | These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease. |
| General Statements: All Other Content | 100% PCR bottles |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 338474 · label 2025-09-25; 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.