Label arithmetic · NIH DSLD 65045
Spring Valley Rapid-Release Magnesium Citrate 100 mg: 100 mg of magnesium per capsule, 3 capsules a day
100 mg of magnesium per capsule; the label's 3 capsules a day give 300 mg. No US price matched (Nov 2). Inside: salt weight, capsule size.
Spring Valley Rapid-Release Magnesium Citrate 100 mg declares 100 mg of elemental magnesium per serving as citrate, which needs 619–885 mg of magnesium citrate in each capsule, against 730 mg in a size 00 capsule at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range: it needs size 00 or larger. 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 65045, label dated 2016-09-22.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 619–885 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: 619–885 mg per capsule · Price: none matched · % DV: 25% vs 24%
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 100 mg of citrate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: Spring Valley Rapid-Release Magnesium Citrate 100 mg implies 619–885 mg of magnesium citrate in each capsule to deliver 100 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 00, read at the most favourable hydration and the most units per serving.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 100 mg |
| Units per serving | 1 |
| Magnesium citrate per serving | 619–885 mg |
| Magnesium citrate per capsule | 619–885 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Needs size 00 |
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 65045 · label 2016-09-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Spring Valley Rapid-Release Magnesium Citrate 100 mg files 1 magnesium line in NIH DSLD 65045; the selected primary line declares 100 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 |
|---|---|---|
| 100 mg | citrate · Magnesium (Form: as Magnesium Citrate) | Primary serving |
Source · NIH DSLD 65045 · label 2016-09-22; 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; 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% | filed magnesium line |
Source · NIH DSLD 65045 · label 2016-09-22; 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 Spring Valley Rapid-Release Magnesium Citrate 100 mg as of 2026-11-02: servings per container are not filed.
computed| Measure | Value |
|---|---|
| Net contents as filed | 100 Capsule(s) |
| Serving size as filed | 1 Capsule(s) |
| Servings per container | Not filed as of 2026-11-02 |
| Servings per day in the directions | 3 |
| 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 65045 · label 2016-09-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "25% Daily Value" mean here, and does it recompute?
The label declares 25% Daily Value; 100 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 24%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 25% | 420 mg | 24% |
Source · NIH DSLD 65045; 21 CFR 101.9 · label 2016-09-22 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Spring Valley Rapid-Release Magnesium Citrate 100 mg 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 gelatin shell, against 43 of 135 citrate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Gelatin |
| 2 | Croscarmellose |
| 3 | Vegetable Magnesium Stearate |
| Shell | gelatin |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
| Target group | Dairy Free |
| Target group | Sugar Free |
Source · NIH DSLD 65045 · label 2016-09-22; 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?
Spring Valley has 3 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Spring Valley 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-0903-2020 | 2020-04-01 | Firm was notified by supplier that Organic Ground Flaxseed powder was under recall by manufacturer due to unapproved herbicide - Haloxyfop | Terminated |
| F-1292-2023 | 2023-08-02 | Product contains undeclared milk. | Terminated |
| F-0664-2024 | 2024-01-10 | Potential mold contamination | 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 65045 · label 2016-09-22; 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 100 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| XYMOGEN Magnesium Citrate (DSLD 6139) | 100 mg | $36.99 · 2026-11-02 | Needs size 00 |
| Vitamin World Magnesium Citrate | 100 mg | No price | Needs size 00 |
| XYMOGEN Magnesium Citrate (DSLD 50041) | 100 mg | $36.99 · 2026-11-02 | Needs size 00 |
| H-E-B Magnesium Citrate 100 mg | 100 mg | No price | Needs size 00 |
| Genestra Brands Magnesium | 100 mg | No price | Needs size 00 |
| MDLogic Magnesium Citrate | 100 mg | No price | Needs size 00 |
Source · NIH DSLD 65045 · label 2016-09-22; 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 65045 (label 2016-09-22, 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 6 81131 08750 6); 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 65045 |
| Label date | 2016-09-22 |
| Date entered into DSLD | 2016-09-22 |
| Barcode (UPC) as filed | 6 81131 08750 6 |
| Distributed by: | Wal-Mart Stores, Inc., Bentonville, AR |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
18 additional rows
| Field | As filed |
|---|---|
| General Statements: All Other Content | Bone health Magnesium is essential for the formation of bone and also supports nerve and muscle health. Magnesium Citrate offers higher absorption compared to magnesium oxide. |
| General Statements: All Other Content | Highly absorbable |
| Suggested/Recommended/Usage/Directions | Suggested Use: Adults, take one capsule three times daily, preferably with meals. |
| Formulation re: Does NOT Contain | No Gluten, Yeast, Wheat, Milk or Milk Derivatives, Lactose, Sugar, Preservatives, Soy, Artificial Color, Artificial Flavor, Sodium (less than 5 mg per serving) |
| Formula re: Contains | No Gluten, Yeast, Wheat, Milk or Milk Derivatives, Lactose, Sugar, Preservatives, Soy, Artificial Color, Artificial Flavor, Sodium (less than 5 mg per serving) |
| Precautions re: Pregnant or Nursing or Prescription Medications | Warning: If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use. |
| Precautions re: All Other | Discontinue use and consult your doctor if any adverse reactions occur. |
| Precautions re: Children | Keep out of reach of children. |
| Storage | Store at room temperature 59(0) - 86(0)F (15(0) - 30(0)C). Keep bottle tightly closed. |
| Precautions re: All Other | For your protection, do not use if seal under cap is broken or missing. |
| Brand IP Statement(s) re: (c), (TM), (SM) | Quality guaranteed Spring Valley products are produced under strict quality guidelines. If you are unhappy with this product, we'll replace it or refund your money. |
| General: Product/Version Code | Item No. 15215 B15215W 01A |
| Formula re: Contains | Rapid-Release Magnesium Citrate 100 mg per capsule |
| General Statements: All Other Content | 108234 |
| 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. |
| FDA Statement of Identity | Dietary Supplement |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 65045 · label 2016-09-22; 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.