Label arithmetic · NIH DSLD 244823
Mason Natural Magnesium 200 mg: 200 mg of magnesium per tablet – gluconate + oxide
400 mg of magnesium per serving. From gluconate + oxide; no US price matched (Nov 2). Inside: label lines, ingredients.
Mason Natural Magnesium 200 mg declares 400 mg of elemental magnesium per 2 tablet(s); the magnesium salt is not resolved from the filed record, Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved., as of 2026-11-02. No US retail price matched as of 2026-11-02. NIH DSLD 244823, label dated 2021-03-25.
as filedData release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: not computable · Price: none matched · % DV: 100% 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.
How much magnesium compound is pressed into one tablet?
The compound mass behind this label cannot be computed as of 2026-11-02: Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved.. The filed amounts are listed in the next block.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 400 mg |
| Units per serving | 2 |
| Magnesium salt per serving | Not computable as of 2026-11-02 |
| Magnesium salt per tablet | Not computable as of 2026-11-02 |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Not computable as of 2026-11-02 |
Source · NIH DSLD 244823 · label 2021-03-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Mason Natural Magnesium 200 mg files 1 magnesium line in NIH DSLD 244823; 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 | gluconate, oxide · Magnesium (Form: as Magnesium Gluconate, and Magnesium Oxide) | Primary serving |
Source · NIH DSLD 244823 · label 2021-03-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's magnesium claim hold up, or could the magnesium come from another source?
The label names 2 magnesium forms (gluconate, oxide); a named blend does not establish how much magnesium each form contributes, so the resolved reading is the most favourable one, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| Magnesium gluconate | 5.9% | named on label |
| Magnesium oxide | 60.3% | named on label |
Source · NIH DSLD 244823 · label 2021-03-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
No US retail price is matched to this label as of 2026-11-02, and without a resolved salt there is no same-salt comparison.
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?
Days per bottle cannot be computed for Mason Natural Magnesium 200 mg as of 2026-11-02: the filed directions give no complete daily frequency.
computed| Measure | Value |
|---|---|
| Net contents as filed | 100 Tablet(s) |
| Serving size as filed | 2 Tablet(s) |
| Servings per container | 50 |
| Servings per day in the directions | Not filed as of 2026-11-02 |
| 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 244823 · label 2021-03-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "100% Daily Value" mean here, and does it recompute?
The label declares 100% Daily Value; 400 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 95%, a difference of 5 points. Labels filed under the earlier 400 mg reference, or with a different filing basis, show gaps of this kind.
computed
Chart data
| Displayed chart text |
|---|
| Declared vs recomputed % |
| DV |
| 95 · 100 |
| Declared vs |
| recomputed % DV |
| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 100% | 420 mg | 95% |
Source · NIH DSLD 244823; 21 CFR 101.9 · label 2021-03-25 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Mason Natural Magnesium 200 mg files 10 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.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Microcrystalline Cellulose |
| 2 | Maltodextrin |
| 3 | Stearic Acid |
| 4 | Vegetable Magnesium Stearate |
| 5 | Silicon Dioxide |
| 6 | Hydroxypropyl Cellulose |
| 7 | Hydroxypropyl Methylcellulose |
| 8 | Croscarmellose Sodium |
5 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| 9 | Titanium Dioxide |
| 10 | Glyceryl Triacetate |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
Source · NIH DSLD 244823 · label 2021-03-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about this form, and about side effects?
No study in the registry measured an unresolved salt 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?
Mason Natural has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Mason Natural 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 244823 · label 2021-03-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
No other label files the same resolved salt within ±10% of this label's dose per unit as of 2026-11-02.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| No neighbour as of 2026-11-02 |
Source · NIH DSLD 244823 · label 2021-03-25; 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 244823 (label 2021-03-25, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 3 gaps remain: Single-salt capacity audit excluded as of 2026-10-17: one salt with a defined elemental fraction is not resolved.; No US retail price matched as of 2026-11-02 (barcode 3 11845 09611 1); A single salt with a defined elemental fraction is unresolved as of 2026-11-02. The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 244823 |
| Label date | 2021-03-25 |
| Date entered into DSLD | 2021-03-25 |
| Barcode (UPC) as filed | 3 11845 09611 1 |
| Manufactured in the USA for | Mason Vitamins, Inc., Miami Lakes, FL |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Seals/Symbols | Mason Guarantee Laboratory Tested cGMP Certified Good Manufacturing Practice |
16 additional rows
| Field | As filed |
|---|---|
| General Statements: All Other Content | Certified N Mason natural Est. 1967 |
| Formulation re: Other | May support nervous system & heart health |
| FDA Statement of Identity | Dietary Supplement |
| Suggested/Recommended/Usage/Directions | Directions: Adults - Take two tablets daily, preferably with food, as a dietary supplement. |
| 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. |
| Formulation re: Does NOT Contain | Guaranteed no added: Sugar, yeast, soy, wheat, dairy, gluten, fish, tree nuts, peanuts, egg, fragrance, artificial colors or flavors, preservatives, animal products, crustacean shellfish. Sodium free. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Caution: If you are pregnant, nursing, taking any medications or have any medical condition, consult your physician before use. |
| Precautions re: All Other | Discontinue use and consult your physician if any adverse reactions occur. |
| Precautions re: Children | Keep out of reach of children. |
| Precautions re: All Other | Tamper-Evident Seal: Do not use product if seal appears tampered. |
| Storage | Store in a dry place under controlled room temperature: 20 degrees - 25 degrees C (68 degrees - 77 degrees F). |
| Formulation re: Does NOT Contain | Gluten free Soy free |
| Brand IP Statement(s) re: (c), (TM), (SM) | Mason Natural is a registered trademark and does not refer to any product or ingredient claim. |
| General Statements: All Other Content | Please recycle |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 244823 · label 2021-03-25; 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.