42 excipient pages + 101 short pages
Other ingredients normalized from filed composition lists: full pages for groups of 10 or more labels, short pages for 3 to 9.
Collection abstract · 2026-08-10
Magnesium supplements compared: 716 US labels, 273 brands
716 magnesium supplements from 273 brands, compared by mg per capsule, salt and price; 5 forms ranked by price per 100 mg. Start with your brand or form.
The NIH DSLD snapshot of 2026-08-10 yields 716 product labels from 273 brands across 17 named forms; 357 labels have a single resolved salt, 75 have a screened price observation from 2026-11-02, and 8 of 137 audited capsule labels exceed the modeled size 000 compound capacity.
Chart data
| Displayed chart text |
|---|
| oxide |
| 60.3% |
| hydroxide |
| 41.7% |
| carbonate |
| 24.8–28.8% |
| chloride |
| 12.0–25.5% |
| sulfate |
| 9.9–20.2% |
| citrate |
| 11.3–16.2% |
| aspartate |
| 7.5–15.6% |
| malate |
| 12.6–15.5% |
| glycinate |
| 11.8–14.1% |
| glycerophosphate |
| 12.5% |
| lactate |
| 10.2–12.0% |
| taurate |
| 8.9% |
| L-threonate |
| 8.3% |
| orotate |
| 7.3% |
| gluconate |
| 5.9% |
Chart data
| Displayed chart text |
|---|
| price rows collected |
| 128 |
| published |
| 75 |
| unique ranked offers |
| 45 |
Explore the measurements
8 research sections connect filed labels, chemistry and source records as of 2026-10-17; section counts follow the published data.
10 label declaration pages
Manufacturer-filed target groups, with counts and source labels.
11 matching-formulation clusters
Shared ingredient lists and serving structures across brands, with price intervals within each salt.
105 salt-to-salt comparisons
Compound mass at equal elemental amounts, preserving hydration intervals.
FDA recall records: 425 across 63 firm-name matches
Dated FDA records matched to brand strings; legal identity and recalled product scope remain attached to each record.
Food vs supplement: 100 mg elemental magnesium
USDA food masses, salt masses and filed capsule arithmetic on one elemental basis.
Label mass-budget audit: 3 capsule capacities
Declared salt mass against size 0, 00 and 000 capsule models, with the calculation shown.
Absorption studies: 16
Published measurements with their populations, endpoints and source papers.
Corpus boundaries
What enters each calculation
From 716 source labels in the 2026-08-10 snapshot, the data layer retains 716 product records and excludes 0; salt assignment, serving arithmetic and price matching each have their own denominator.
| Field | Count | Meaning and date |
|---|---|---|
| Product labels | 716 | Retained on-market labels with a numeric magnesium candidate · 2026-08-10 |
| Brands | 273 | Brand groups represented by retained labels · 2026-08-10 |
| Named forms | 17 | Distinct normalized form names in extracted primary rows · 2026-08-10 |
| Single resolved salt | 357 | Salt assigned from the primary row or full DSLD record · 2026-08-10 |
| Unambiguous elemental amount | 684 | A single amount selected from the primary magnesium declaration · 2026-08-10 |
| Elemental container total | 591 | Elemental mg multiplied by numeric servings per container · 2026-08-10 |
| Screened price observations | 75 | Product records matched to the price set, including matches awaiting review · 2026-11-02 |
| Verified price-set rows | 56 | Price matches with review completed in the supplied price set · 2026-11-02 |
One record represents a label, so this is a count of declarations in the retained snapshot. Form membership follows extracted primary-row names; the chemistry assignment may additionally use the full record. A label mentioning multiple forms can belong to multiple form groups.
Salt-level abstract
All 17 form groups
The 17 groups below report label counts and median declared elemental milligrams per serving from the 2026-08-10 snapshot, with magnesium fractions and mass-budget flags alongside each group. Each median uses that group's unambiguous declarations at or below 1,000 mg; its sample size appears in the same cell.
| Form / salt | Labels | Median elemental mg / serving | Elemental Mg by mass | Exceeds 000 / audited capsules | Dated reading |
|---|---|---|---|---|---|
| Magnesium amino acid chelate | 19 | 300 mg · n=17 | No defined compound fraction as of 2026-08-10 | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium amino acid chelate appears on 19 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. The group name does not identify one stoichiometric compound. |
| Magnesium ascorbate | 7 | 321 mg · n=6 | No defined compound fraction as of 2026-08-10 | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium ascorbate appears on 7 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. The group name does not identify one stoichiometric compound. |
| Magnesium aspartate | 33 | 200 mg · n=31 | 7.49–15.64% | 0 / 9 0.0% | At 2026-08-10, magnesium aspartate appears on 33 labels; 8 audited labels fit size 0/00, 1 require 000 and 0 exceed 000. Fraction range: 1:1 magnesium aspartate 15.64%; bis(hydrogen aspartate) 8.42%, its dihydrate 7.49%; stoichiometry and hydration unresolved. |
| Magnesium carbonate | 9 | 350 mg · n=9 | 24.78–28.83% | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium carbonate appears on 9 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. Fraction range: anhydrous or hydrated; labels rarely state which. |
| Magnesium chloride | 4 | 100 mg · n=4 | 11.96–25.53% | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium chloride appears on 4 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. Fraction range: anhydrous 25.5%, hexahydrate 12.0%. |
| Magnesium citrate | 118 | 217.5 mg · n=116 | 11.30–16.16% | 2 / 33 6.1% | At 2026-08-10, magnesium citrate appears on 118 labels; 16 audited labels fit size 0/00, 15 require 000 and 2 exceed 000. Fraction range: trimagnesium dicitrate 16.2%; dibasic and hydrated forms as low as 11.3%. |
| Magnesium dimagnesium malate | 6 | 175 mg · n=6 | No defined compound fraction as of 2026-08-10 | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium dimagnesium malate appears on 6 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. The group name does not identify one stoichiometric compound. |
| Magnesium gluconate | 14 | 133 mg · n=14 | 5.86% | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium gluconate appears on 14 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. Formula: Mg(C₆H₁₁O₇)₂. |
| Magnesium glycinate | 65 | 300 mg · n=64 | 11.83–14.10% | 0 / 7 0.0% | At 2026-08-10, magnesium glycinate appears on 65 labels; 5 audited labels fit size 0/00, 2 require 000 and 0 exceed 000. Fraction range: bisglycinate; chelate hydration varies by supplier. |
| Magnesium hydroxide | 6 | 124 mg · n=6 | 41.68% | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium hydroxide appears on 6 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. Formula: Mg(OH)₂. |
| Magnesium lactate | 2 | 400 mg · n=2 | 10.19–12.01% | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium lactate appears on 2 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. Fraction range: anhydrous 12.01% or dihydrate 10.19% (238.48 g/mol). |
| Magnesium lysinate | 9 | 235 mg · n=9 | No defined compound fraction as of 2026-08-10 | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium lysinate appears on 9 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. The group name does not identify one stoichiometric compound. |
| Magnesium malate | 33 | 350 mg · n=29 | 12.63–15.54% | 0 / 2 0.0% | At 2026-08-10, magnesium malate appears on 33 labels; 2 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. Fraction range: anhydrous 15.54% or dihydrate 12.63% (192.41 g/mol). |
| Magnesium orotate | 4 | 212.5 mg · n=4 | 7.27% | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium orotate appears on 4 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. Formula: Mg(C₅H₃N₂O₄)₂. |
| Magnesium oxide | 108 | 320 mg · n=107 | 60.32% | 0 / 10 0.0% | At 2026-08-10, magnesium oxide appears on 108 labels; 9 audited labels fit size 0/00, 1 require 000 and 0 exceed 000. Formula: MgO. |
| Magnesium taurate | 2 | 262.5 mg · n=2 | 8.92% | 0 / 0 No audited capsules as of 2026-08-10 | At 2026-08-10, magnesium taurate appears on 2 labels; 0 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. Formula: Mg(C₂H₆NO₃S)₂. |
| Magnesium L-threonate | 4 | 144 mg · n=4 | 8.25% | 0 / 3 0.0% | At 2026-08-10, magnesium l-threonate appears on 4 labels; 3 audited labels fit size 0/00, 0 require 000 and 0 exceed 000. Formula: Mg(C₄H₇O₅)₂. |
The median describes label declarations per serving; it does not measure a capsule or a container. The data layer excludes declarations above 1,000 mg and ambiguous primary amounts from these medians. The audit column uses capsule records with an available mass budget, a different subset. Group totals can overlap and therefore cannot be added to reconstruct the corpus total.
Capsule distribution
137 labels have a capsule mass budget
In the 2026-08-10 corpus, 82 of 137 audited capsule labels fit size 0/00, 47 require size 000 and 8 exceed size 000, at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range; another 206 records have a compound mass calculation without a capsule verdict, and 373 have no computable mass budget.
| Outcome | Labels | Basis |
|---|---|---|
| Fits size 0 or 00 | 82 | 59.9% of audited capsules; smallest mass ≤ 730 mg per unit |
| Requires size 000 | 47 | 34.3% of audited capsules; smallest mass > 730 and ≤ 1100 mg per unit |
| Exceeds size 000 | 8 | 5.8% of audited capsules; smallest mass > 1100 mg per unit |
| Compound mass only | 206 | The physical-state field is not classified as a capsule · 2026-08-10 |
| Mass budget unavailable | 373 | No single resolved salt or no unambiguous elemental amount · 2026-08-10 |
The capsule calculation divides elemental mg by the assigned salt's magnesium fraction and then by serving units. Verdicts use the smallest mass in the hydration interval: a record in the “fits” group may require a larger capsule at the other end of the interval. The capacity model allocates the fill to the compound before excipients; product pages expose the full mass range.
Open the audit register for the flagged product list and complete method →
Entries into the collection
Find a label, compare salts, check the arithmetic
The 2026-08-10 snapshot offers 716 product records and 17 form groups, while the calculator converts any supplied container's 3 numeric fields into EC100.
Find a product
Start with the 716 labels in the 2026-08-10 product index. Match brand, name and DSLD identifier, then inspect the original declaration and any linked price.
The brand index groups those records into 273 portfolios.
Compare salts
Explore 17 form groups from 2026-08-10 in the form index. For a fixed elemental amount, compare compound mass, hydration interval and capsule count.
Glycinate vs citrate · Glycinate vs oxide · Best by price per 100 mg, inside each form
Check a label's arithmetic
The calculator shows compound requirements at 100, 200 and 400 mg elemental magnesium using the chemistry accompanying the 2026-08-10 snapshot. Enter price, elemental mg and servings to compute a container's EC100.
Use the declared elemental line for that calculation; the heavier compound mass has its own table.
Coverage gaps and provenance
What the collection still leaves unresolved
At 2026-08-10, 359 product labels have no single resolved salt and 8 have ambiguous elemental amounts; at 2026-11-02, 641 have no matched price observation.
- The 411 labels without a mapped primary-row form (2026-08-10) are a separate count from unresolved chemistry. A full-record salt assignment can fill a gap in the extracted row without changing membership in the form-name table.
- The 75 screened price observations (2026-11-02) include provisional matches. Within-salt price pages show review status and sample sizes; a salt's registry median includes a broader set of declarations than its price sample.
- The 0 excluded source records (2026-08-10) fail the retained-product rules, such as an off-market flag or the absence of a numeric magnesium declaration after other-nutrient rows are removed. Coverage counts describe this retained collection.
Source: NIH Dietary Supplement Label Database, snapshot 2026-08-10. Follow downloadable publication fields and the methodology for the label-price arithmetic. For a different measurement question, the absorption literature page reports study designs, endpoints, populations and limits with original citations.
Food vs supplement: masses per 100 mg magnesium · FDA recall records and matching method