Label arithmetic · NIH DSLD 213752
The Vitamin Shoppe Magnesium Threonate: 48 mg of magnesium per capsule, 3 capsules a day
48 mg of magnesium per capsule; the label's 3 capsules a day give 144 mg. No US price matched (Nov 2). Inside: salt weight, capsule size.
The Vitamin Shoppe Magnesium Threonate declares 144 mg of elemental magnesium per serving as l-threonate, which needs 582 mg of magnesium l-threonate 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; 2 of the 8 l-threonate labels in this registry have a matched price. NIH DSLD 213752, label dated 2020-02-26.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 582 mg of l-threonate per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 582 mg per capsule · Price: none matched · % DV: 34% vs 34%
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 144 mg of l-threonate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: The Vitamin Shoppe Magnesium Threonate implies 582 mg of magnesium l-threonate in each capsule to deliver 144 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 | 144 mg |
| Units per serving | 3 |
| Magnesium l-threonate per serving | 1,745 mg |
| Magnesium l-threonate per capsule | 582 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Needs size 00 |
Source · NIH DSLD 213752 · label 2020-02-26; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
The Vitamin Shoppe Magnesium Threonate files 1 magnesium line in NIH DSLD 213752; the selected primary line declares 144 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 |
|---|---|---|
| 144 mg | Salt not named in this row; magnesium l-threonate is taken from the label text | Primary serving |
Source · NIH DSLD 213752 · label 2020-02-26; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's l-threonate claim hold up, or could the magnesium come from another source?
The label names one magnesium form, l-threonate, 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 L-threonate | 8.3% | full NIH DSLD record text |
Source · NIH DSLD 213752 · label 2020-02-26; 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; 2 of 8 l-threonate labels have one, against a median of $1.1572 per 100 mg among 1 ranked l-threonate offer.
computed
Chart data
| Displayed chart text |
|---|
| n=1 |
| median $1.1572 |
| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 1 | Momentous Magnesium Threonate | $1.1572 | 2026-11-02 |
| Median | 1 ranked l-threonate offer | $1.1572 | 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, The Vitamin Shoppe Magnesium Threonate lasts 30 days: 30 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 90 Vegetable Capsule(s) |
| Serving size as filed | 3 Vegetable Capsule(s) |
| Servings per container | 30 |
| Servings per day in the directions | 1 |
| Days per bottle | 30 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 213752 · label 2020-02-26; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "34% Daily Value" mean here, and does it recompute?
The label declares 34% Daily Value; 144 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 34%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 34% | 420 mg | 34% |
Source · NIH DSLD 213752; 21 CFR 101.9 · label 2020-02-26 · 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?
The Vitamin Shoppe Magnesium Threonate files 3 other ingredients and a vegetarian shell, and no magnesium stearate, against 1 of 8 l-threonate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Modified Cellulose |
| 2 | L-Leucine |
| 3 | Silicon Dioxide |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
| Target group | Dairy Free |
Source · NIH DSLD 213752 · label 2020-02-26; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about l-threonate, and about side effects?
No study in the registry measured l-threonate 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?
The Vitamin Shoppe has 1 FDA recall record matched by brand name in the enforcement data queried 2026-10-19. The Vitamin Shoppe 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-1143-2020 | 2020-08-12 | Sample analysis revealed product is sub-potent for Vitamin D | 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 213752 · label 2020-02-26; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
3 labels use the same resolved l-threonate within ±10% of this label's 48 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| Momentous Magnesium Threonate | 48 mg | $49.99 · 2026-11-02 | Needs size 00 |
| Dr. Mercola Magnesium Advanced | 48 mg | $34.97 · 2026-09-21 | Needs size 00 |
| Source Naturals Magtein Magnesium L-Threonate 667 mg | 49 mg | No price | Needs size 00 |
Source · NIH DSLD 213752 · label 2020-02-26; 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 213752 (label 2020-02-26, 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 7 66536 03920 3). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 213752 |
| Label date | 2020-02-26 |
| Date entered into DSLD | 2020-02-26 |
| Barcode (UPC) as filed | 7 66536 03920 3 |
| Distributed by | Vitamin Shoppe, Inc., Secaucus, NJ |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
16 additional rows
| Field | As filed |
|---|---|
| Formula re: Contains | Highly bioavailable form of magnesium |
| Formulation re: Other | Supports brain health |
| General Statements: All Other Content | Specialty |
| FDA Statement of Identity | Dietary Supplement |
| Seals/Symbols | Quality promise Tested & trusted |
| Formulation re: Does NOT Contain | Gluten-free Dairy-free Soy-free Nut-free |
| Formulation re: Does NOT Contain | Does not contain: Gluten, salt, artificial colors or flavors. |
| 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. |
| Suggested/Recommended/Usage/Directions | Directions: Take three (3) vegetable capsules per day, with or without food. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Warning: Consult your healthcare provider prior to use if you are pregnant, nursing, taking any medications or have any medical conditions. |
| Storage | Store in a cool, dry place. |
| Precautions re: Children | Keep out of reach of children. |
| Precautions re: All Other | Tamper evident Do not use if outer seal is broken or missing. |
| Brand IP Statement(s) re: (c), (TM), (SM) | Magtein is a trademark of Magceutics inc. and is distributed exclusively by AIDP, Inc. |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 213752 · label 2020-02-26; 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.