Label arithmetic · NIH DSLD 232010
Douglas Laboratories Malic Acid + Magnesium: 86 mg of magnesium per tablet, 1 tablet a day
86 mg of magnesium per tablet, 1 a day. No US price matched (Nov 2). Inside: salt weight, %DV check.
Douglas Laboratories Malic Acid + Magnesium declares 86 mg of elemental magnesium per serving as hydroxide, which means 206 mg of magnesium hydroxide 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 5 hydroxide labels in this registry have a matched price. NIH DSLD 232010, label dated 2020-08-23.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| gluconate |
| 1,468 |
| orotate |
| 1,183 |
| L-threonate |
| 1,042 |
| taurate |
| 964 |
| lactate |
| 716 |
| glycerophosphate |
| 688 |
| glycinate |
| 610 |
| malate |
| 553 |
| aspartate |
| 550 |
| citrate |
| 532 |
| sulfate |
| 426 |
| chloride |
| 337 |
| carbonate |
| 298 |
| hydroxide |
| 206 |
| oxide |
| 143 |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 206 mg per tablet · Price: none matched · % DV: 20% vs 20%
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 hydroxide is pressed into one tablet?
Douglas Laboratories Malic Acid + Magnesium carries 206 mg of magnesium hydroxide per serving for 86 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 | 86 mg |
| Units per serving | 1 |
| Magnesium hydroxide per serving | 206 mg |
| Magnesium hydroxide per tablet | 206 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Capsule sizes do not apply |
Source · NIH DSLD 232010 · label 2020-08-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Douglas Laboratories Malic Acid + Magnesium files 1 magnesium line in NIH DSLD 232010; the selected primary line declares 86 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 |
|---|---|---|
| 86 mg | hydroxide · Magnesium (Form: as magnesium hydroxide) | Primary serving |
Source · NIH DSLD 232010 · label 2020-08-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's hydroxide claim hold up, or could the magnesium come from another source?
The label names one magnesium form, hydroxide, 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 hydroxide | 41.7% | filed magnesium line |
Source · NIH DSLD 232010 · label 2020-08-23; 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 5 hydroxide labels have one, against a median of none per 100 mg among 0 ranked hydroxide 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, Douglas Laboratories Malic Acid + Magnesium lasts 180 days: 180 servings against 1 serving a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 180 Tablet(s) |
| Serving size as filed | 1 Tablet(s) |
| Servings per container | 180 |
| Servings per day in the directions | 1 |
| Days per bottle | 180 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 232010 · label 2020-08-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "20% Daily Value" mean here, and does it recompute?
The label declares 20% Daily Value; 86 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 20%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 20% | 420 mg | 20% |
Source · NIH DSLD 232010; 21 CFR 101.9 · label 2020-08-23 · 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?
Douglas Laboratories Malic Acid + Magnesium files 6 other ingredients and a vegetarian shell, and no magnesium stearate, against 0 of 5 hydroxide labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Microcrystalline Cellulose |
| 2 | Coating |
| 3 | Stearic Acid |
| 4 | Vegetable Stearate |
| 5 | Croscarmellose Sodium |
| 6 | Silica |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
1 additional rows
| Entry | Filed ingredient or declaration |
|---|---|
| Target group | Gluten Free |
Source · NIH DSLD 232010 · label 2020-08-23; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about hydroxide, and about side effects?
1 study in the PubMed-checked registry measured outcomes involving hydroxide; none reports a gastrointestinal outcome as of 2026-11-02. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2025 | Comparing the Bioavailability of Two Seawater-Derived Magnesium Preparations. | 40955524 |
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?
Douglas Laboratories has 1 FDA recall record matched by brand name in the enforcement data queried 2026-10-19. Douglas Laboratories 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-1202-2015 | 2015-02-18 | Bottles contained a vegetarian digestive enzyme dietary supplement instead of melatonin. | 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 232010 · label 2020-08-23; 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 232010 · label 2020-08-23; 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 232010 (label 2020-08-23, 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 3 10539 00341 1). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 232010 |
| Label date | 2020-08-23 |
| Date entered into DSLD | 2020-08-23 |
| Barcode (UPC) as filed | 3 10539 00341 1 |
| Label version · Package size difference, same product | NIH DSLD 10270 |
| Label version · Image difference, same product | NIH DSLD 10271 |
| Label version · Image difference, same product | NIH DSLD 5315 |
| Label version · Package size difference, same product | NIH DSLD 10271 |
18 additional rows
| Field | As filed |
|---|---|
| Label version · Package size difference, same product | NIH DSLD 5315 |
| Manufactured by | Douglas Laboratories, Pittsburgh, PA |
| Claim category as filed | Nutrient |
| Claim category as filed | All Other |
| Claim category as filed | Structure/Function |
| Suggested/Recommended/Usage/Directions | Suggested Usage: As a dietary supplement, adults take 1 tablet daily or as directed by your health professional. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Warning: If you are pregnant, nursing, have any health condition or taking any medication, consult your health professional before using this product. |
| Precautions re: Children | Keep out of the reach of children. |
| Storage | Store in a cool, dry place. |
| Precautions re: All Other | Use only if safety seal is intact. |
| Formulation re: Does NOT Contain | Gluten-free, Non-GMO |
| FDA Statement of Identity | 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. |
| General Statements: All Other Content | Scan to learn about our manufacturing excellence Contents may not fill package in order to accommodate required labeling. Please rely on stated quantity. |
| FDA Statement of Identity | Dietary Supplement |
| Formulation re: Other | Support for energy production and muscular function |
| Physical state | Tablet or Pill |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 232010 · label 2020-08-23; 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.