Label arithmetic · NIH DSLD 256377
Wonder Laboratories Magnesium: 133 mg of magnesium per tablet, 1–3 tablets a day
133 mg of magnesium per tablet; the label's 1–3 tablets a day give 133–399 mg. No US price matched (Nov 2). Inside: salt weight, %DV check.
Wonder Laboratories Magnesium declares 133 mg of elemental magnesium per serving as carbonate, which means 461–537 mg of magnesium carbonate 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; 0 of the 3 carbonate labels in this registry have a matched price. NIH DSLD 256377, label dated 2021-10-22.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| gluconate |
| 2,270 |
| orotate |
| 1,829 |
| L-threonate |
| 1,612 |
| taurate |
| 1,491 |
| lactate |
| 1,107 |
| glycerophosphate |
| 1,064 |
| glycinate |
| 943 |
| malate |
| 856 |
| aspartate |
| 850 |
| citrate |
| 823 |
| sulfate |
| 659 |
| chloride |
| 521 |
| carbonate |
| 461 |
| hydroxide |
| 319 |
| oxide |
| 220 |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 461–537 mg per tablet · Price: none matched · % DV: 32% vs 32%
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 carbonate is pressed into one tablet?
Wonder Laboratories Magnesium carries 461–537 mg of magnesium carbonate per serving for 133 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 | 133 mg |
| Units per serving | 1 |
| Magnesium carbonate per serving | 461–537 mg |
| Magnesium carbonate per tablet | 461–537 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 (anhydrous or hydrated; labels rarely state which), so the compound mass is a range.
Source · NIH DSLD 256377 · label 2021-10-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Wonder Laboratories Magnesium files 1 magnesium line in NIH DSLD 256377; the selected primary line declares 133 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 |
|---|---|---|
| 133 mg | Salt not named in this row; magnesium carbonate is taken from the label text | Primary serving |
Source · NIH DSLD 256377 · label 2021-10-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's carbonate claim hold up, or could the magnesium come from another source?
The label names one magnesium form, carbonate, resolved from the full NIH DSLD record text; 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 carbonate | 24.8–28.8% | full NIH DSLD record text |
Source · NIH DSLD 256377 · label 2021-10-22; 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; 0 of 3 carbonate labels have one, against a median of none per 100 mg among 0 ranked carbonate offers.
computed| Rank | Label | Per 100 mg | Observed |
|---|
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, Wonder Laboratories Magnesium lasts 83–250 days: 250 servings against 1–3 servings a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 250 Tablet(s) |
| Serving size as filed | 1 Tablet(s) |
| Servings per container | 250 |
| Servings per day in the directions | 1–3 |
| Days per bottle | 83–250 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 256377 · label 2021-10-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "32% Daily Value" mean here, and does it recompute?
The label declares 32% Daily Value; 133 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 32%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 32% | 420 mg | 32% |
Source · NIH DSLD 256377; 21 CFR 101.9 · label 2021-10-22 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Wonder Laboratories Magnesium files 6 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 2 of 3 carbonate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Vegetable Cellulose |
| 2 | L-Glycine |
| 3 | Vegetable Magnesium Silicate |
| 4 | Stearic Acid |
| 5 | Silica |
| 6 | Vegetable Magnesium Stearate |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
1 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Target group | Gluten Free |
Source · NIH DSLD 256377 · label 2021-10-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about carbonate, and about side effects?
2 studies in the PubMed-checked registry measured outcomes involving carbonate; none reports a gastrointestinal outcome as of 2026-11-02. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2022 | Effects of short-term magnesium supplementation on ionized, total magnesium and other relevant electrolytes levels. | 35041150 |
| 2005 | Study of magnesium bioavailability from ten organic and inorganic Mg salts in Mg-depleted rats using a stable isotope approach | 16548135 |
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?
Wonder Laboratories has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Wonder Laboratories has no FDA CAERS adverse event report on record at brand level as of 2026-10-19 (143 of 273 brands in this registry have at least one CAERS report).
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?
Same filed formulation as 2 other labels of this brand; no other brand files it as of 2026-11-02.
computed| Label | Brand | Price per 100 mg |
|---|---|---|
| No cross-brand match as of 2026-11-02 |
Source · NIH DSLD 256377 · label 2021-10-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
1 label use the same resolved carbonate 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 |
|---|---|---|---|
| Wonder Laboratories Magnesium | 133 mg | No price | Capsule sizes do not apply |
Source · NIH DSLD 256377 · label 2021-10-22; 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 256377 (label 2021-10-22, 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 0 99528 13825 8). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 256377 |
| Label date | 2021-10-22 |
| Date entered into DSLD | 2021-10-22 |
| Barcode (UPC) as filed | 0 99528 13825 8 |
| Label version · Package size difference, same product | NIH DSLD 263907 |
| Label version · Package size difference, same product | NIH DSLD 260580 |
| Label version · Image difference, same product | NIH DSLD 263907 |
| Label version · Package size difference, same product | NIH DSLD 162688 |
26 additional rows
| Field | As filed |
|---|---|
| Label version · Package size difference, same product | NIH DSLD 215403 |
| Label version · Package size difference, same product | NIH DSLD 262641 |
| Label version · Package size difference, same product | NIH DSLD 256376 |
| Label version · Image difference, same product | NIH DSLD 215403 |
| Label version · Image difference, same product | NIH DSLD 260580 |
| Label version · Package size difference, same product | NIH DSLD 215402 |
| Distributed by: | Wonder Laboratories, White House, TN |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Suggested/Recommended/Usage/Directions | Directions: As a dietary supplement, take 1 tablet three times a day. |
| Precautions re: All Other | Tamper Evident: Do not use this product if imprinted foil seal under cap is broken or missing. |
| Formulation re: Other | Mfg. in an FDA Registered Facility using Good Manufacturing Practices (GMPs) |
| Storage | Keep tightly closed. Store at room temperature: 59 degrees-86 degrees F (15 degrees-30 degrees C). |
| Precautions re: Children | Keep out of reach of children. |
| Formulation re: Other | Conforms to USP <2091> for weight. Meets USP <2040> disintegration for maximum bioavailability. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Caution: If you are pregnant or nursing, consult your physician before taking this product. |
| FDA Disclaimer Statement | This statement has 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 | Amino Acid Chelated Magnesium |
| Formulation re: Other | Helps regulate calcium metabolism |
| Formulation re: Does NOT Contain | Gluten Free |
| FDA Statement of Identity | Dietary Supplement |
| Formulation re: Other | Made in USA |
| General Statements: All Other Content | Formula 138 |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 256377 · label 2021-10-22; 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.