Equal elemental amount · snapshot 2026-08-10
For 200 mg elemental magnesium, magnesium glycerophosphate requires 1,600 mg of compound and magnesium l-threonate requires 2,424 mg, using the chemistry accompanying the 2026-08-10 label snapshot. This difference follows from the magnesium fraction of each compound. It requires no absorption-study assumption: the same elemental mass travels with a different mass of the rest of the compound.
Show the working
At 100, 200 and 400 mg elemental magnesium, the chemistry accompanying the 2026-08-10 snapshot uses 12.50% magnesium by mass for magnesium glycerophosphate and 8.25% for magnesium l-threonate; dividing the elemental amount by these fractions gives the compound masses below.
| Property | Magnesium glycerophosphate | Magnesium L-threonate |
|---|---|---|
| Elemental Mg by compound mass | 12.50% | 8.25% |
| Anhydrous reference formula | MgC₃H₇O₆P | Mg(C₄H₇O₅)₂ |
| Molar mass of that reference formula | 194.36 g/mol | 294.50 g/mol |
| Composition interval | One formula fraction used for MgC₃H₇O₆P in this model. | One formula fraction used for Mg(C₄H₇O₅)₂ in this model. |
| Compound for 100 mg elemental Mg | 800 mg | 1,212 mg |
| Compound for 200 mg elemental Mg | 1,600 mg | 2,424 mg |
| Compound for 400 mg elemental Mg | 3,200 mg | 4,848 mg |
| Size 00 capsules for 100 mg elemental Mg | 2 capsules at 730 mg compound fill each | 2 capsules at 730 mg compound fill each |
| Size 00 capsules for 200 mg elemental Mg | 3 capsules at 730 mg compound fill each | 4 capsules at 730 mg compound fill each |
| Size 00 capsules for 400 mg elemental Mg | 5 capsules at 730 mg compound fill each | 7 capsules at 730 mg compound fill each |
Molar masses refer to the displayed anhydrous formulas. Hydrated or composition-ambiguous readings use the full fraction interval from the chemistry layer. Compound masses are rounded to whole milligrams; capsule counts round the unrounded mass divided by 730 mg upward at each interval endpoint.
For 200 mg elemental magnesium as magnesium glycerophosphate, the chemistry accompanying the 2026-08-10 snapshot requires 1,600 mg of compound: 200 ÷ 0.1250, rounded to whole milligrams.
That requires 3 size 00 capsules at 730 mg of compound per capsule, before other ingredients. The model uses the MgC₃H₇O₆P fraction throughout.
For 200 mg elemental magnesium as magnesium l-threonate, the chemistry accompanying the 2026-08-10 snapshot requires 2,424 mg of compound: 200 ÷ 0.0825, rounded to whole milligrams.
That requires 4 size 00 capsules at 730 mg of compound per capsule, before other ingredients. The model uses the Mg(C₄H₇O₅)₂ fraction throughout.
40 arithmetic inputs from 25 to 1,000 mg elemental magnesium are converted below using the two salt fractions and the capsule capacities accompanying the 2026-08-10 snapshot, calculated 2026-10-17. These are mass-conversion inputs, independent of any consumption schedule.
Each compound interval divides the elemental input by the high and low magnesium fractions. Each capsule interval divides those unrounded compound masses by the listed fill capacity, then rounds upward. The three capsule sizes use 545, 730 and 1100 mg of compound per capsule respectively, before other ingredients.
| Elemental Mg | Magnesium glycerophosphate: compound mass | Magnesium glycerophosphate: size 0 | Magnesium glycerophosphate: size 00 | Magnesium glycerophosphate: size 000 | Magnesium L-threonate: compound mass | Magnesium L-threonate: size 0 | Magnesium L-threonate: size 00 | Magnesium L-threonate: size 000 |
|---|---|---|---|---|---|---|---|---|
| 25 mg elemental Mg | 200 mg compound | 1 capsule at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill | 303 mg compound | 1 capsule at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill |
| 50 mg elemental Mg | 400 mg compound | 1 capsule at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill | 606 mg compound | 2 capsules at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill |
| 75 mg elemental Mg | 600 mg compound | 2 capsules at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill | 909 mg compound | 2 capsules at 545 mg fill | 2 capsules at 730 mg fill | 1 capsule at 1100 mg fill |
| 100 mg elemental Mg | 800 mg compound | 2 capsules at 545 mg fill | 2 capsules at 730 mg fill | 1 capsule at 1100 mg fill | 1,212 mg compound | 3 capsules at 545 mg fill | 2 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 125 mg elemental Mg | 1,000 mg compound | 2 capsules at 545 mg fill | 2 capsules at 730 mg fill | 1 capsule at 1100 mg fill | 1,515 mg compound | 3 capsules at 545 mg fill | 3 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 150 mg elemental Mg | 1,200 mg compound | 3 capsules at 545 mg fill | 2 capsules at 730 mg fill | 2 capsules at 1100 mg fill | 1,818 mg compound | 4 capsules at 545 mg fill | 3 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 175 mg elemental Mg | 1,400 mg compound | 3 capsules at 545 mg fill | 2 capsules at 730 mg fill | 2 capsules at 1100 mg fill | 2,121 mg compound | 4 capsules at 545 mg fill | 3 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 200 mg elemental Mg | 1,600 mg compound | 3 capsules at 545 mg fill | 3 capsules at 730 mg fill | 2 capsules at 1100 mg fill | 2,424 mg compound | 5 capsules at 545 mg fill | 4 capsules at 730 mg fill | 3 capsules at 1100 mg fill |
| 225 mg elemental Mg | 1,800 mg compound | 4 capsules at 545 mg fill | 3 capsules at 730 mg fill | 2 capsules at 1100 mg fill | 2,727 mg compound | 6 capsules at 545 mg fill | 4 capsules at 730 mg fill | 3 capsules at 1100 mg fill |
| 250 mg elemental Mg | 2,000 mg compound | 4 capsules at 545 mg fill | 3 capsules at 730 mg fill | 2 capsules at 1100 mg fill | 3,030 mg compound | 6 capsules at 545 mg fill | 5 capsules at 730 mg fill | 3 capsules at 1100 mg fill |
| 275 mg elemental Mg | 2,200 mg compound | 5 capsules at 545 mg fill | 4 capsules at 730 mg fill | 2 capsules at 1100 mg fill | 3,333 mg compound | 7 capsules at 545 mg fill | 5 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 300 mg elemental Mg | 2,400 mg compound | 5 capsules at 545 mg fill | 4 capsules at 730 mg fill | 3 capsules at 1100 mg fill | 3,636 mg compound | 7 capsules at 545 mg fill | 5 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 325 mg elemental Mg | 2,600 mg compound | 5 capsules at 545 mg fill | 4 capsules at 730 mg fill | 3 capsules at 1100 mg fill | 3,939 mg compound | 8 capsules at 545 mg fill | 6 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 350 mg elemental Mg | 2,800 mg compound | 6 capsules at 545 mg fill | 4 capsules at 730 mg fill | 3 capsules at 1100 mg fill | 4,242 mg compound | 8 capsules at 545 mg fill | 6 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 375 mg elemental Mg | 3,000 mg compound | 6 capsules at 545 mg fill | 5 capsules at 730 mg fill | 3 capsules at 1100 mg fill | 4,545 mg compound | 9 capsules at 545 mg fill | 7 capsules at 730 mg fill | 5 capsules at 1100 mg fill |
| 400 mg elemental Mg | 3,200 mg compound | 6 capsules at 545 mg fill | 5 capsules at 730 mg fill | 3 capsules at 1100 mg fill | 4,848 mg compound | 9 capsules at 545 mg fill | 7 capsules at 730 mg fill | 5 capsules at 1100 mg fill |
| 425 mg elemental Mg | 3,400 mg compound | 7 capsules at 545 mg fill | 5 capsules at 730 mg fill | 4 capsules at 1100 mg fill | 5,152 mg compound | 10 capsules at 545 mg fill | 8 capsules at 730 mg fill | 5 capsules at 1100 mg fill |
| 450 mg elemental Mg | 3,600 mg compound | 7 capsules at 545 mg fill | 5 capsules at 730 mg fill | 4 capsules at 1100 mg fill | 5,455 mg compound | 11 capsules at 545 mg fill | 8 capsules at 730 mg fill | 5 capsules at 1100 mg fill |
| 475 mg elemental Mg | 3,800 mg compound | 7 capsules at 545 mg fill | 6 capsules at 730 mg fill | 4 capsules at 1100 mg fill | 5,758 mg compound | 11 capsules at 545 mg fill | 8 capsules at 730 mg fill | 6 capsules at 1100 mg fill |
| 500 mg elemental Mg | 4,000 mg compound | 8 capsules at 545 mg fill | 6 capsules at 730 mg fill | 4 capsules at 1100 mg fill | 6,061 mg compound | 12 capsules at 545 mg fill | 9 capsules at 730 mg fill | 6 capsules at 1100 mg fill |
| 525 mg elemental Mg | 4,200 mg compound | 8 capsules at 545 mg fill | 6 capsules at 730 mg fill | 4 capsules at 1100 mg fill | 6,364 mg compound | 12 capsules at 545 mg fill | 9 capsules at 730 mg fill | 6 capsules at 1100 mg fill |
| 550 mg elemental Mg | 4,400 mg compound | 9 capsules at 545 mg fill | 7 capsules at 730 mg fill | 4 capsules at 1100 mg fill | 6,667 mg compound | 13 capsules at 545 mg fill | 10 capsules at 730 mg fill | 7 capsules at 1100 mg fill |
| 575 mg elemental Mg | 4,600 mg compound | 9 capsules at 545 mg fill | 7 capsules at 730 mg fill | 5 capsules at 1100 mg fill | 6,970 mg compound | 13 capsules at 545 mg fill | 10 capsules at 730 mg fill | 7 capsules at 1100 mg fill |
| 600 mg elemental Mg | 4,800 mg compound | 9 capsules at 545 mg fill | 7 capsules at 730 mg fill | 5 capsules at 1100 mg fill | 7,273 mg compound | 14 capsules at 545 mg fill | 10 capsules at 730 mg fill | 7 capsules at 1100 mg fill |
| 625 mg elemental Mg | 5,000 mg compound | 10 capsules at 545 mg fill | 7 capsules at 730 mg fill | 5 capsules at 1100 mg fill | 7,576 mg compound | 14 capsules at 545 mg fill | 11 capsules at 730 mg fill | 7 capsules at 1100 mg fill |
| 650 mg elemental Mg | 5,200 mg compound | 10 capsules at 545 mg fill | 8 capsules at 730 mg fill | 5 capsules at 1100 mg fill | 7,879 mg compound | 15 capsules at 545 mg fill | 11 capsules at 730 mg fill | 8 capsules at 1100 mg fill |
| 675 mg elemental Mg | 5,400 mg compound | 10 capsules at 545 mg fill | 8 capsules at 730 mg fill | 5 capsules at 1100 mg fill | 8,182 mg compound | 16 capsules at 545 mg fill | 12 capsules at 730 mg fill | 8 capsules at 1100 mg fill |
| 700 mg elemental Mg | 5,600 mg compound | 11 capsules at 545 mg fill | 8 capsules at 730 mg fill | 6 capsules at 1100 mg fill | 8,485 mg compound | 16 capsules at 545 mg fill | 12 capsules at 730 mg fill | 8 capsules at 1100 mg fill |
| 725 mg elemental Mg | 5,800 mg compound | 11 capsules at 545 mg fill | 8 capsules at 730 mg fill | 6 capsules at 1100 mg fill | 8,788 mg compound | 17 capsules at 545 mg fill | 13 capsules at 730 mg fill | 8 capsules at 1100 mg fill |
| 750 mg elemental Mg | 6,000 mg compound | 12 capsules at 545 mg fill | 9 capsules at 730 mg fill | 6 capsules at 1100 mg fill | 9,091 mg compound | 17 capsules at 545 mg fill | 13 capsules at 730 mg fill | 9 capsules at 1100 mg fill |
| 775 mg elemental Mg | 6,200 mg compound | 12 capsules at 545 mg fill | 9 capsules at 730 mg fill | 6 capsules at 1100 mg fill | 9,394 mg compound | 18 capsules at 545 mg fill | 13 capsules at 730 mg fill | 9 capsules at 1100 mg fill |
| 800 mg elemental Mg | 6,400 mg compound | 12 capsules at 545 mg fill | 9 capsules at 730 mg fill | 6 capsules at 1100 mg fill | 9,697 mg compound | 18 capsules at 545 mg fill | 14 capsules at 730 mg fill | 9 capsules at 1100 mg fill |
| 825 mg elemental Mg | 6,600 mg compound | 13 capsules at 545 mg fill | 10 capsules at 730 mg fill | 6 capsules at 1100 mg fill | 10,000 mg compound | 19 capsules at 545 mg fill | 14 capsules at 730 mg fill | 10 capsules at 1100 mg fill |
| 850 mg elemental Mg | 6,800 mg compound | 13 capsules at 545 mg fill | 10 capsules at 730 mg fill | 7 capsules at 1100 mg fill | 10,303 mg compound | 19 capsules at 545 mg fill | 15 capsules at 730 mg fill | 10 capsules at 1100 mg fill |
| 875 mg elemental Mg | 7,000 mg compound | 13 capsules at 545 mg fill | 10 capsules at 730 mg fill | 7 capsules at 1100 mg fill | 10,606 mg compound | 20 capsules at 545 mg fill | 15 capsules at 730 mg fill | 10 capsules at 1100 mg fill |
| 900 mg elemental Mg | 7,200 mg compound | 14 capsules at 545 mg fill | 10 capsules at 730 mg fill | 7 capsules at 1100 mg fill | 10,909 mg compound | 21 capsules at 545 mg fill | 15 capsules at 730 mg fill | 10 capsules at 1100 mg fill |
| 925 mg elemental Mg | 7,400 mg compound | 14 capsules at 545 mg fill | 11 capsules at 730 mg fill | 7 capsules at 1100 mg fill | 11,212 mg compound | 21 capsules at 545 mg fill | 16 capsules at 730 mg fill | 11 capsules at 1100 mg fill |
| 950 mg elemental Mg | 7,600 mg compound | 14 capsules at 545 mg fill | 11 capsules at 730 mg fill | 7 capsules at 1100 mg fill | 11,515 mg compound | 22 capsules at 545 mg fill | 16 capsules at 730 mg fill | 11 capsules at 1100 mg fill |
| 975 mg elemental Mg | 7,800 mg compound | 15 capsules at 545 mg fill | 11 capsules at 730 mg fill | 8 capsules at 1100 mg fill | 11,818 mg compound | 22 capsules at 545 mg fill | 17 capsules at 730 mg fill | 11 capsules at 1100 mg fill |
| 1000 mg elemental Mg | 8,000 mg compound | 15 capsules at 545 mg fill | 11 capsules at 730 mg fill | 8 capsules at 1100 mg fill | 12,121 mg compound | 23 capsules at 545 mg fill | 17 capsules at 730 mg fill | 12 capsules at 1100 mg fill |
A whole capsule count describes the minimum number of modelled containers needed to hold compound mass. It does not establish the dimensions, packing density or excipient content of a retail product. The ingredient list and serving statement on each linked record supply the product-specific context.
Declarations against capacity
In the 2026-08-10 snapshot, the magnesium glycerophosphate form group has 0 audited capsule labels and the magnesium l-threonate group has 6; their distributions below use the mass-budget counts stored for each form, at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range.
| Salt group | All labels | Audited capsules | Fits 0/00 | Needs 000 | Exceeds 000 |
|---|---|---|---|---|---|
| Magnesium glycerophosphate | 0 | 0 | 0 | 0 | 0 |
| Magnesium L-threonate | 9 | 6 | 6 | 0 | 0 |
No US label in the NIH DSLD snapshot 2026-08-10 names magnesium glycerophosphate, so no capsule verdict is counted for it; the compound mass above is pure chemistry.
At 2026-08-10, magnesium l-threonate has 6 of 6 audited capsule labels at or below 730 mg minimum compound mass per capsule, 0 above 730 mg but at or below 1100 mg, and 0 above 1100 mg. Its other 3 labels have no capsule verdict in this group, either because they are not classified as capsules or because a mass budget is unavailable.
The audit divides a label's elemental amount by its assigned salt fraction and serving-unit count. It uses the highest fraction, hence the smallest required mass. A hydration interval can move a nominally fitting label into a larger size at its high-mass end. A result exceeding 000 means the assigned single salt exceeds this fill model even at the low-mass end.
Form groups include names in extracted primary rows, resolved salts and full-record salt mentions, and can overlap; a capsule verdict requires a single assigned salt matching this group. These are counts of label declarations, with the capsule model allocating the fill to the compound. Inspect individual serving statements and assigned salts in the audit register and the linked form pages.
Literature coverage
As of the literature review dated 2026-09-11, the supplied study collection associates 0 publications with magnesium glycerophosphate and 0 with magnesium l-threonate; the combined list contains 0 unique publications, with shared records printed once.
| Salt | Publications | Publication years |
|---|---|---|
| Magnesium glycerophosphate | 0 | No studies mapped as of 2026-09-11 |
| Magnesium L-threonate | 0 | No studies mapped as of 2026-09-11 |
Membership means that at least one selected salt appears in the study's recorded coverage; it does not mean every paper directly compares this exact pair. In particular, an amino-acid-chelate arm does not establish a chemically defined bisglycinate preparation. Each record below retains its actual design, population, read-out and limits.
8 of 9 labels mentioning magnesium l-threonate are shown in brand order from the supplied NIH DSLD records, calculated 2026-10-17. Salt mentions can overlap; only records assigned this single salt enter its capsule audit above.
| Brand / label | Salt / physical state | Filed serving | Observed item price / EC100 |
|---|---|---|---|
| Dr. Mercola Magnesium AdvancedNIH DSLD 327131 · label 2025-03-25 | Magnesium L-threonateCapsule | 3 Capsule(s)145 mg elemental magnesium per serving | $34.97 per container; cost per 100 mg not computedObserved 2026-09-21 · provisional (the filed elemental amount (2000 mg per serving) is likely the compound mass) |
| Dr. Mercola Magnesium AdvancedNIH DSLD 327132 · label 2025-03-25 | Magnesium L-threonateCapsule | 3 Capsule(s)Elemental amount unresolved as of 2026-10-17 | No published price matched to barcode 8 10487 03069 4 as of 2026-10-17. |
| Momentous Magnesium ThreonateNIH DSLD 321465 · label 2025-02-23 | Magnesium L-threonateCapsule | 3 Capsule(s)144 mg elemental magnesium per serving | $49.99 per container; $1.1572 per 100 mgObserved 2026-11-02 · confirmed |
| Nootropics Depot Magtein Magnesium L-Threonate PowderNIH DSLD 232390 · label 2020-08-23 | Magnesium L-threonatePowder | 1–2 mg144 mg elemental magnesium per serving | No published price matched to NIH DSLD 232390; barcode not filed as of 2026-10-17. |
| Protocol For Life Balance Magtein Magnesium L-ThreonateNIH DSLD 326454 · label 2025-03-25 | Magnesium L-threonateCapsule | 1 Veg Capsule(s)144 mg elemental magnesium per serving | No published price matched to barcode 7 07359 12390 8 as of 2026-10-17. |
| Signature Supplements Magnesium ComplexNIH DSLD 338836 · label 2025-09-25 | Single salt unresolved as of 2026-10-17Capsule | 2 Capsule(s)Elemental amount unresolved as of 2026-10-17 | No published price matched to NIH DSLD 338836; barcode not filed as of 2026-10-17. |
| Source Naturals Magtein Magnesium L-Threonate 667 mgNIH DSLD 274903 · label 2022-09-22 | Magnesium L-threonateCapsule | 3 Capsule(s)147 mg elemental magnesium per serving | No published price matched to barcode 0 21078 02486 6 as of 2026-10-17. |
| Teraputics Pure Life Magnesium L-ThreonateNIH DSLD 245277 · label 2021-03-25 | Magnesium L-threonateCapsule | 4 Vegan Capsule(s)144 mg elemental magnesium per serving | No published price matched to barcode X001Q9O7VN as of 2026-10-17. |
Open the salt index and linked records to inspect ingredient lists, the source of the assigned salt and dated gaps in price matching.
Retail observations · after chemistry and evidence
As of 2026-10-17, the published price set contains 0 verified magnesium glycerophosphate matches and 1 verified magnesium l-threonate matches. Each table below contains one salt and its own sample size; verified medians describe only that salt's verified rows.
EC100 = container price ÷ (declared elemental mg per serving × servings per container ÷ 100). It normalizes the container's elemental amount. The observations use one-time item prices, without coupons or subscriptions and excluding shipping. The tables retain the two salts' page order; sorting operates inside an individual salt table.
As of 2026-10-17, magnesium glycerophosphate has 0 verified matches and 0 pending matches in the price set. No verified median is available as of 2026-10-17. Observation dates: No published observations as of 2026-10-17.
0 verified retail matches are published for magnesium glycerophosphate as of 2026-10-17.
There are 0 pending price matches for magnesium glycerophosphate as of 2026-10-17.
As of 2026-10-17, magnesium l-threonate has 1 verified matches and 1 pending matches in the price set. Its verified EC100 median is $1.1572 per 100 mg elemental magnesium (n=1); pending matches are excluded from that median. Observation dates: 2026-09-21 to 2026-11-02.
| Momentous | Magnesium ThreonateNIH DSLD · Label 321465 | 144 mg | 30 | $49.99Per container · Price observed 2026-11-02, Amazon | $1.15724.32 total elemental g/container | Verified |
These candidate retail-to-label matches remain separate from verified rows and are not included in verified medians.
| Dr. Mercola | Magnesium AdvancedNIH DSLD · Label 327131 | 2,000 mg | 30 | $34.97Per container · Price observed 2026-09-21, Amazon | Not computedthe filed elemental amount (2000 mg per serving) is likely the compound mass | Pending · provisional |
To reproduce a container calculation, use the elemental cost calculator and its static mass tables. The magnesium collection abstract connects each salt group to the label corpus; the literature collection puts the cited measurements in their broader study context.