Label arithmetic · NIH DSLD 307647
Jarrow Formulas Magnesium Optimizer: 50 mg of magnesium per tablet, 2–4 tablets a day (salt not resolved)
50 mg of magnesium per tablet; the label's 2–4 tablets a day give 100–200 mg. Salt not resolved from the NIH record. Inside: label lines, ingredients.
Jarrow Formulas Magnesium Optimizer declares 100 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 307647, label dated 2024-02-22.
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: 24% 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.
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 | 100 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 307647 · label 2024-02-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Jarrow Formulas Magnesium Optimizer files 1 magnesium line in NIH DSLD 307647; 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 | Salt not named in this row as of 2026-11-02 | Primary serving |
Source · NIH DSLD 307647 · label 2024-02-22; 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?
No single magnesium salt is resolved from the filed record as of 2026-11-02, so the source of the declared magnesium cannot be checked against capsule capacity, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| No form named as of 2026-11-02 | No defined fraction | named on label |
Source · NIH DSLD 307647 · label 2024-02-22; 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, 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?
At the label's own serving, Jarrow Formulas Magnesium Optimizer lasts 50–100 days: 100 servings against 1–2 servings a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 200 Tablet(s) |
| Serving size as filed | 2 Tablet(s) |
| Servings per container | 100 |
| Servings per day in the directions | 1–2 |
| Days per bottle | 50–100 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 307647 · label 2024-02-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "24% Daily Value" mean here, and does it recompute?
The label declares 24% 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 | 24% | 420 mg | 24% |
Source · NIH DSLD 307647; 21 CFR 101.9 · label 2024-02-22 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain magnesium stearate, what shell is it, and who is it filed for?
Jarrow Formulas Magnesium Optimizer files 8 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 | Calcium Carbonate |
| 3 | Hydroxypropyl Cellulose |
| 4 | Croscarmellose Sodium |
| 5 | Magnesium Stearate |
| 6 | Hydroxypropylmethylcellulose |
| 7 | Glycerin |
| 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 | No Allergies |
| Target group | Gluten Free |
| Target group | Dairy Free |
Source · NIH DSLD 307647 · label 2024-02-22; 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?
Jarrow Formulas has 1 FDA recall record matched by brand name in the enforcement data queried 2026-10-19. Jarrow Formulas 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-0682-2018 | 2018-02-07 | A higher than normal micro result was found at the six month time point for one lot of Liquid L-Carnitine. | 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 307647 · label 2024-02-22; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
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 307647 · label 2024-02-22; 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 307647 (label 2024-02-22, 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 7 90011 13007 9); 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 307647 |
| Scanned label (PDF) | Label 307647 scan |
| Label date | 2024-02-22 |
| Date entered into DSLD | 2024-02-22 |
| Barcode (UPC) as filed | 7 90011 13007 9 |
| Label version · Image difference, same product | NIH DSLD 7841 |
| Label version · Image difference, same product | NIH DSLD 29547 |
| Label version · Image difference, same product | NIH DSLD 37432 |
25 additional rows
| Field | As filed |
|---|---|
| Label version · Image difference, same product | NIH DSLD 212304 |
| Label version · Image difference, same product | NIH DSLD 243394 |
| Label version · Image difference, same product | NIH DSLD 264900 |
| Distributed by | Jarrow Formulas, Inc., Sherman Oaks, CA, USA |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Suggested/Recommended/Usage/Directions | Suggested use: Adults take 2 tablets 1-2 times a day with meals or as directed by your qualified healthcare professional. |
| Formula re: Contains | Magnesium Optimizer is a synergistic combination of nutrients to support optimizing magnesium status. Magnesium supports nerve, muscle function, and bone health. Magnesium can be utilized by physically active individuals to support exercise and endurance activities. Taurine, a free-form amino acid antioxidant, is a cell membrane stabilizer. Taurine supports magnesium status and aids in osmoregulation. Pyridoxal 5-Phosphate (P-5-P) is the coenzyme form of vitamin B6 and supports the metabolism of proteins and amino acids. Magnesium and vitamin B6 are cofactors in multiple enzyme systems in the body. Together, magnesium and vitamin B6 support cellular energy production including the synthesis of ATP, the universal energy molecule. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Warning: Consult a healthcare professional before using this product if you are pregnant, nursing, under the age of 18, are taking medication or have a medical condition; if adverse reactions occur, discontinue use. |
| Precautions re: Children | Warning: Consult a healthcare professional before using this product if you are pregnant, nursing, under the age of 18, are taking medication or have a medical condition; if adverse reactions occur, discontinue use. Keep out of the reach of children. |
| Storage | Store in a cool, dry place. |
| 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 and disease. |
| Precautions re: All Other | Do not use if safety seal is damaged or missing. |
| Formulation re: Vegetarian/Vegan | Vegan |
| Formula re: Contains | Synergistic nutrients |
| Formulation re: Other | Supports nerve, muscle function, and bone health |
| Formulation re: Does NOT Contain | Non-GMO Gluten free |
| FDA Statement of Identity | Dietary Supplement |
| Formulation re: Does NOT Contain | No wheat, gluten, soybeans, dairy, egg, fish/shellfish, peanuts/tree nuts or sesame. |
| Formulation re: Other | Easy-Solv |
| Brand IP Statement(s) re: (c), (TM), (SM) | Copyright 2022 Jarrow Formulas |
| General Statements: All Other Content | Bone & joint |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 307647 · label 2024-02-22; 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.