Label arithmetic · NIH DSLD 299929
MegaFood Magnesium: 50 mg of magnesium per tablet, 1 tablet a day
50 mg of magnesium per tablet, 1 a day. No US price matched (Nov 2). Inside: salt weight, %DV check.
MegaFood Magnesium declares 50 mg of elemental magnesium per serving as glycinate, which means 355–423 mg of magnesium glycinate 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 73 glycinate labels in this registry have a matched price. NIH DSLD 299929, label dated 2023-11-22.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| gluconate |
| 853 |
| orotate |
| 688 |
| L-threonate |
| 606 |
| taurate |
| 561 |
| lactate |
| 416 |
| glycerophosphate |
| 400 |
| glycinate |
| 355 |
| malate |
| 322 |
| aspartate |
| 320 |
| citrate |
| 309 |
| sulfate |
| 248 |
| chloride |
| 196 |
| carbonate |
| 173 |
| hydroxide |
| 120 |
| oxide |
| 83 |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 355–423 mg per tablet · Price: none matched · % DV: 12% vs 12%
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 glycinate is pressed into one tablet?
MegaFood Magnesium carries 355–423 mg of magnesium glycinate per serving for 50 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 | 50 mg |
| Units per serving | 1 |
| Magnesium glycinate per serving | 355–423 mg |
| Magnesium glycinate per tablet | 355–423 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 (bisglycinate; chelate hydration varies by supplier), so the compound mass is a range.
Source · NIH DSLD 299929 · label 2023-11-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
MegaFood Magnesium files 1 magnesium line in NIH DSLD 299929; the selected primary line declares 50 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 |
|---|---|---|
| 50 mg | bisglycinate · Fermented magnesium bisglycinate | Primary serving |
Source · NIH DSLD 299929 · label 2023-11-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's glycinate claim hold up, or could the magnesium come from another source?
The label names one magnesium form, glycinate, 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 glycinate | 11.8–14.1% | filed magnesium line |
Source · NIH DSLD 299929 · label 2023-11-22; 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 73 glycinate labels have one, against a median of $0.1889 per 100 mg among 17 ranked glycinate offers.
computed
Chart data
| Displayed chart text |
|---|
| n=17 |
| P25 $0.1338 |
| P75 $0.2216 |
| median $0.1889 |
| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 1 | Amazon Elements Chelated Magnesium 270 mg | $0.0666 | 2026-11-02 |
| 2 | Solgar Chelated Magnesium | $0.0930 | 2026-11-02 |
| 3 | tnvitamins Magnesium Glycinate 300 mg | $0.0962 | 2026-11-02 |
| 4 | New Chapter Magnesium + Ashwagandha | $0.1229 | 2026-11-02 |
| 5 | Windmill Magnesium Glycinate 200 mg | $0.1338 | 2026-11-02 |
| Median | 17 ranked glycinate offers | $0.1889 | 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, MegaFood Magnesium lasts 60 days: 60 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 60 Tablet(s) |
| Serving size as filed | 1 Tablet(s) |
| Servings per container | 60 |
| Servings per day in the directions | 1 |
| Days per bottle | 60 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 299929 · label 2023-11-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "12% Daily Value" mean here, and does it recompute?
The label declares 12% Daily Value; 50 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 12%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 12% | 420 mg | 12% |
Source · NIH DSLD 299929; 21 CFR 101.9 · label 2023-11-22 · 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?
MegaFood Magnesium files 8 other ingredients and a vegetarian shell, and no magnesium stearate, against 28 of 73 glycinate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Brown Rice |
| 2 | Rice Protein |
| 3 | Autolyzed Yeast Extract |
| 4 | Yeast |
| 5 | Microcrystalline Cellulose |
| 6 | Stearic Acid |
| 7 | Hypromellose |
| 8 | Silicon Dioxide |
7 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Shell | vegetarian |
| Target group | Vegan |
| Target group | Vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Kosher |
| Target group | Gluten Free |
| Target group | Dairy Free |
Source · NIH DSLD 299929 · label 2023-11-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about glycinate, and about side effects?
6 studies in the PubMed-checked registry measured outcomes involving glycinate; 2 mention gastrointestinal or adverse outcomes. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2024 | Comparative Clinical Study on Magnesium Absorption and Side Effects After Oral Intake of Microencapsulated Magnesium (MAGSHAPE™ Microcapsules) Versus Other Magnesium Sources. | 39770988 |
| 2024 | The bioaccessibility and tolerability of marine-derived sources of magnesium and calcium. | 38608850 |
| 2020 | Dose-Dependent Absorption Profile of Different Magnesium Compounds | 30761462 |
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?
MegaFood has 4 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. MegaFood 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-1133-2014 | 2014-01-01 | Potential for Chloramphenicol contamination. | Terminated |
| F-1134-2014 | 2014-01-01 | Potential for Chloramphenicol contamination. | Terminated |
| F-1132-2014 | 2014-01-01 | Potential for Chloramphenicol contamination. | Terminated |
| F-1362-2016 | 2016-05-25 | Multi Vitamin label fails to have required warning statement for iron and child resistant cap | 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?
Same filed formulation as 1 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 299929 · label 2023-11-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
2 labels use the same resolved glycinate within ±10% of this label's 50 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| Douglas Laboratories Magnesium Glycinate Forte | 50 mg | No price | Fits size 0 |
| MegaFood Magnesium | 50 mg | No price | Capsule sizes do not apply |
Source · NIH DSLD 299929 · label 2023-11-22; 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 299929 (label 2023-11-22, 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 51494 10187 2). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 299929 |
| Scanned label (PDF) | Label 299929 scan |
| Label date | 2023-11-22 |
| Date entered into DSLD | 2023-11-22 |
| Barcode (UPC) as filed | 0 51494 10187 2 |
| Label version · Image difference, same product | NIH DSLD 287375 |
| Label version · Image difference, same product | NIH DSLD 43407 |
| Label version · Image difference, same product | NIH DSLD 62564 |
29 additional rows
| Field | As filed |
|---|---|
| Label version · Image difference, same product | NIH DSLD 2525 |
| Label version · Image difference, same product | NIH DSLD 177958 |
| Label version · Image difference, same product | NIH DSLD 265195 |
| Label version · Package size difference, same product | NIH DSLD 327566 |
| Label version · Package size difference, same product | NIH DSLD 287375 |
| Made by | MegaFood, Manchester, NH, USA |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Formulation re: Does NOT Contain | Made without milk, eggs, peanuts, tree nuts, soy, wheat, fish, shellfish and sesame. |
| General Statements: All Other Content | Learn about our seals: megafood.com/standards |
| Formulation re: Does NOT Contain | Pesticides Tested For 125+ Herbicides |
| Formulation re: Does NOT Contain | Made Without 9 Food Allergens Glyphosate Residue Free detoxproject.org Gluten Free |
| Formulation re: Vegetarian/Vegan | Certified Vegan Vegan.org |
| Formula re: Kosher | OK (Kosher) |
| Seals/Symbols | Tested for 125+ Pesticides Herbicides Glyphosate Residue free detoxproject.org Certified Vegan Vegan.org Certified B Corporation OK (Kosher) |
| Brand IP Statement(s) re: (c), (TM), (SM) | MegaFood From Farm to Tablet |
| Formulation re: Other | An essential mineral for muscle relaxation |
| FDA Statement of Identity | Dietary Supplement |
| Formulation re: Does NOT Contain | Non GMO Project Verified nongmoproject.org |
| Seals/Symbols | Non GMO Project Verified nongmoproject.org |
| Suggested/Recommended/Usage/Directions | Suggested use: Adults take 1 tablet daily with a beverage. May be taken any time of day, even on an empty stomach. |
| Formulation re: Other | MegaFood Magnesium helps support a healthy heart, the nervous system, and muscle relaxation. |
| General Statements: All Other Content | Satisfaction guarantee or your money back. |
| 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. |
| Precautions re: Children | Keep out of reach of children. |
| Storage | Store tightly sealed in a cool place and avoid exposure to moisture. Once open, consume within three months. |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 299929 · label 2023-11-22; 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.