Equal elemental amount · snapshot 2026-08-10
For 200 mg elemental magnesium, magnesium aspartate requires 1,279–2,670 mg of compound and magnesium glycerophosphate requires 1,600 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 7.49–15.64% magnesium by mass for magnesium aspartate and 12.50% for magnesium glycerophosphate; dividing the elemental amount by these fractions gives the compound masses below.
| Property | Magnesium aspartate | Magnesium glycerophosphate |
|---|---|---|
| Elemental Mg by compound mass | 7.49–15.64% | 12.50% |
| Anhydrous reference formula | MgC₄H₅NO₄ | MgC₃H₇O₆P |
| Molar mass of that reference formula | 155.39 g/mol | 194.36 g/mol |
| Composition interval | 1:1 magnesium aspartate 15.64%; bis(hydrogen aspartate) 8.42%, its dihydrate 7.49%; stoichiometry and hydration unresolved | One formula fraction used for MgC₃H₇O₆P in this model. |
| Compound for 100 mg elemental Mg | 639–1,335 mg | 800 mg |
| Compound for 200 mg elemental Mg | 1,279–2,670 mg | 1,600 mg |
| Compound for 400 mg elemental Mg | 2,558–5,340 mg | 3,200 mg |
| Size 00 capsules for 100 mg elemental Mg | 1–2 capsules at 730 mg compound fill each | 2 capsules at 730 mg compound fill each |
| Size 00 capsules for 200 mg elemental Mg | 2–4 capsules at 730 mg compound fill each | 3 capsules at 730 mg compound fill each |
| Size 00 capsules for 400 mg elemental Mg | 4–8 capsules at 730 mg compound fill each | 5 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 aspartate, the chemistry accompanying the 2026-08-10 snapshot requires 1,279–2,670 mg of compound: 200 ÷ 0.1564 through 200 ÷ 0.0749, rounded to whole milligrams.
That requires 2–4 size 00 capsules at 730 mg of compound per capsule, before other ingredients. The mass interval reflects 1:1 magnesium aspartate 15.64%; bis(hydrogen aspartate) 8.42%, its dihydrate 7.49%; stoichiometry and hydration unresolved.
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.
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 aspartate: compound mass | Magnesium aspartate: size 0 | Magnesium aspartate: size 00 | Magnesium aspartate: size 000 | Magnesium glycerophosphate: compound mass | Magnesium glycerophosphate: size 0 | Magnesium glycerophosphate: size 00 | Magnesium glycerophosphate: size 000 |
|---|---|---|---|---|---|---|---|---|
| 25 mg elemental Mg | 160–334 mg compound | 1 capsule at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill | 200 mg compound | 1 capsule at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill |
| 50 mg elemental Mg | 320–668 mg compound | 1–2 capsules at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill | 400 mg compound | 1 capsule at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill |
| 75 mg elemental Mg | 480–1,001 mg compound | 1–2 capsules at 545 mg fill | 1–2 capsules at 730 mg fill | 1 capsule at 1100 mg fill | 600 mg compound | 2 capsules at 545 mg fill | 1 capsule at 730 mg fill | 1 capsule at 1100 mg fill |
| 100 mg elemental Mg | 639–1,335 mg compound | 2–3 capsules at 545 mg fill | 1–2 capsules at 730 mg fill | 1–2 capsules at 1100 mg fill | 800 mg compound | 2 capsules at 545 mg fill | 2 capsules at 730 mg fill | 1 capsule at 1100 mg fill |
| 125 mg elemental Mg | 799–1,669 mg compound | 2–4 capsules at 545 mg fill | 2–3 capsules at 730 mg fill | 1–2 capsules at 1100 mg fill | 1,000 mg compound | 2 capsules at 545 mg fill | 2 capsules at 730 mg fill | 1 capsule at 1100 mg fill |
| 150 mg elemental Mg | 959–2,003 mg compound | 2–4 capsules at 545 mg fill | 2–3 capsules at 730 mg fill | 1–2 capsules at 1100 mg fill | 1,200 mg compound | 3 capsules at 545 mg fill | 2 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 175 mg elemental Mg | 1,119–2,336 mg compound | 3–5 capsules at 545 mg fill | 2–4 capsules at 730 mg fill | 2–3 capsules at 1100 mg fill | 1,400 mg compound | 3 capsules at 545 mg fill | 2 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 200 mg elemental Mg | 1,279–2,670 mg compound | 3–5 capsules at 545 mg fill | 2–4 capsules at 730 mg fill | 2–3 capsules at 1100 mg fill | 1,600 mg compound | 3 capsules at 545 mg fill | 3 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 225 mg elemental Mg | 1,439–3,004 mg compound | 3–6 capsules at 545 mg fill | 2–5 capsules at 730 mg fill | 2–3 capsules at 1100 mg fill | 1,800 mg compound | 4 capsules at 545 mg fill | 3 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 250 mg elemental Mg | 1,598–3,338 mg compound | 3–7 capsules at 545 mg fill | 3–5 capsules at 730 mg fill | 2–4 capsules at 1100 mg fill | 2,000 mg compound | 4 capsules at 545 mg fill | 3 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 275 mg elemental Mg | 1,758–3,672 mg compound | 4–7 capsules at 545 mg fill | 3–6 capsules at 730 mg fill | 2–4 capsules at 1100 mg fill | 2,200 mg compound | 5 capsules at 545 mg fill | 4 capsules at 730 mg fill | 2 capsules at 1100 mg fill |
| 300 mg elemental Mg | 1,918–4,005 mg compound | 4–8 capsules at 545 mg fill | 3–6 capsules at 730 mg fill | 2–4 capsules at 1100 mg fill | 2,400 mg compound | 5 capsules at 545 mg fill | 4 capsules at 730 mg fill | 3 capsules at 1100 mg fill |
| 325 mg elemental Mg | 2,078–4,339 mg compound | 4–8 capsules at 545 mg fill | 3–6 capsules at 730 mg fill | 2–4 capsules at 1100 mg fill | 2,600 mg compound | 5 capsules at 545 mg fill | 4 capsules at 730 mg fill | 3 capsules at 1100 mg fill |
| 350 mg elemental Mg | 2,238–4,673 mg compound | 5–9 capsules at 545 mg fill | 4–7 capsules at 730 mg fill | 3–5 capsules at 1100 mg fill | 2,800 mg compound | 6 capsules at 545 mg fill | 4 capsules at 730 mg fill | 3 capsules at 1100 mg fill |
| 375 mg elemental Mg | 2,398–5,007 mg compound | 5–10 capsules at 545 mg fill | 4–7 capsules at 730 mg fill | 3–5 capsules at 1100 mg fill | 3,000 mg compound | 6 capsules at 545 mg fill | 5 capsules at 730 mg fill | 3 capsules at 1100 mg fill |
| 400 mg elemental Mg | 2,558–5,340 mg compound | 5–10 capsules at 545 mg fill | 4–8 capsules at 730 mg fill | 3–5 capsules at 1100 mg fill | 3,200 mg compound | 6 capsules at 545 mg fill | 5 capsules at 730 mg fill | 3 capsules at 1100 mg fill |
| 425 mg elemental Mg | 2,717–5,674 mg compound | 5–11 capsules at 545 mg fill | 4–8 capsules at 730 mg fill | 3–6 capsules at 1100 mg fill | 3,400 mg compound | 7 capsules at 545 mg fill | 5 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 450 mg elemental Mg | 2,877–6,008 mg compound | 6–12 capsules at 545 mg fill | 4–9 capsules at 730 mg fill | 3–6 capsules at 1100 mg fill | 3,600 mg compound | 7 capsules at 545 mg fill | 5 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 475 mg elemental Mg | 3,037–6,342 mg compound | 6–12 capsules at 545 mg fill | 5–9 capsules at 730 mg fill | 3–6 capsules at 1100 mg fill | 3,800 mg compound | 7 capsules at 545 mg fill | 6 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 500 mg elemental Mg | 3,197–6,676 mg compound | 6–13 capsules at 545 mg fill | 5–10 capsules at 730 mg fill | 3–7 capsules at 1100 mg fill | 4,000 mg compound | 8 capsules at 545 mg fill | 6 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 525 mg elemental Mg | 3,357–7,009 mg compound | 7–13 capsules at 545 mg fill | 5–10 capsules at 730 mg fill | 4–7 capsules at 1100 mg fill | 4,200 mg compound | 8 capsules at 545 mg fill | 6 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 550 mg elemental Mg | 3,517–7,343 mg compound | 7–14 capsules at 545 mg fill | 5–11 capsules at 730 mg fill | 4–7 capsules at 1100 mg fill | 4,400 mg compound | 9 capsules at 545 mg fill | 7 capsules at 730 mg fill | 4 capsules at 1100 mg fill |
| 575 mg elemental Mg | 3,676–7,677 mg compound | 7–15 capsules at 545 mg fill | 6–11 capsules at 730 mg fill | 4–7 capsules at 1100 mg fill | 4,600 mg compound | 9 capsules at 545 mg fill | 7 capsules at 730 mg fill | 5 capsules at 1100 mg fill |
| 600 mg elemental Mg | 3,836–8,011 mg compound | 8–15 capsules at 545 mg fill | 6–11 capsules at 730 mg fill | 4–8 capsules at 1100 mg fill | 4,800 mg compound | 9 capsules at 545 mg fill | 7 capsules at 730 mg fill | 5 capsules at 1100 mg fill |
| 625 mg elemental Mg | 3,996–8,344 mg compound | 8–16 capsules at 545 mg fill | 6–12 capsules at 730 mg fill | 4–8 capsules at 1100 mg fill | 5,000 mg compound | 10 capsules at 545 mg fill | 7 capsules at 730 mg fill | 5 capsules at 1100 mg fill |
| 650 mg elemental Mg | 4,156–8,678 mg compound | 8–16 capsules at 545 mg fill | 6–12 capsules at 730 mg fill | 4–8 capsules at 1100 mg fill | 5,200 mg compound | 10 capsules at 545 mg fill | 8 capsules at 730 mg fill | 5 capsules at 1100 mg fill |
| 675 mg elemental Mg | 4,316–9,012 mg compound | 8–17 capsules at 545 mg fill | 6–13 capsules at 730 mg fill | 4–9 capsules at 1100 mg fill | 5,400 mg compound | 10 capsules at 545 mg fill | 8 capsules at 730 mg fill | 5 capsules at 1100 mg fill |
| 700 mg elemental Mg | 4,476–9,346 mg compound | 9–18 capsules at 545 mg fill | 7–13 capsules at 730 mg fill | 5–9 capsules at 1100 mg fill | 5,600 mg compound | 11 capsules at 545 mg fill | 8 capsules at 730 mg fill | 6 capsules at 1100 mg fill |
| 725 mg elemental Mg | 4,636–9,680 mg compound | 9–18 capsules at 545 mg fill | 7–14 capsules at 730 mg fill | 5–9 capsules at 1100 mg fill | 5,800 mg compound | 11 capsules at 545 mg fill | 8 capsules at 730 mg fill | 6 capsules at 1100 mg fill |
| 750 mg elemental Mg | 4,795–10,013 mg compound | 9–19 capsules at 545 mg fill | 7–14 capsules at 730 mg fill | 5–10 capsules at 1100 mg fill | 6,000 mg compound | 12 capsules at 545 mg fill | 9 capsules at 730 mg fill | 6 capsules at 1100 mg fill |
| 775 mg elemental Mg | 4,955–10,347 mg compound | 10–19 capsules at 545 mg fill | 7–15 capsules at 730 mg fill | 5–10 capsules at 1100 mg fill | 6,200 mg compound | 12 capsules at 545 mg fill | 9 capsules at 730 mg fill | 6 capsules at 1100 mg fill |
| 800 mg elemental Mg | 5,115–10,681 mg compound | 10–20 capsules at 545 mg fill | 8–15 capsules at 730 mg fill | 5–10 capsules at 1100 mg fill | 6,400 mg compound | 12 capsules at 545 mg fill | 9 capsules at 730 mg fill | 6 capsules at 1100 mg fill |
| 825 mg elemental Mg | 5,275–11,015 mg compound | 10–21 capsules at 545 mg fill | 8–16 capsules at 730 mg fill | 5–11 capsules at 1100 mg fill | 6,600 mg compound | 13 capsules at 545 mg fill | 10 capsules at 730 mg fill | 6 capsules at 1100 mg fill |
| 850 mg elemental Mg | 5,435–11,348 mg compound | 10–21 capsules at 545 mg fill | 8–16 capsules at 730 mg fill | 5–11 capsules at 1100 mg fill | 6,800 mg compound | 13 capsules at 545 mg fill | 10 capsules at 730 mg fill | 7 capsules at 1100 mg fill |
| 875 mg elemental Mg | 5,595–11,682 mg compound | 11–22 capsules at 545 mg fill | 8–17 capsules at 730 mg fill | 6–11 capsules at 1100 mg fill | 7,000 mg compound | 13 capsules at 545 mg fill | 10 capsules at 730 mg fill | 7 capsules at 1100 mg fill |
| 900 mg elemental Mg | 5,754–12,016 mg compound | 11–23 capsules at 545 mg fill | 8–17 capsules at 730 mg fill | 6–11 capsules at 1100 mg fill | 7,200 mg compound | 14 capsules at 545 mg fill | 10 capsules at 730 mg fill | 7 capsules at 1100 mg fill |
| 925 mg elemental Mg | 5,914–12,350 mg compound | 11–23 capsules at 545 mg fill | 9–17 capsules at 730 mg fill | 6–12 capsules at 1100 mg fill | 7,400 mg compound | 14 capsules at 545 mg fill | 11 capsules at 730 mg fill | 7 capsules at 1100 mg fill |
| 950 mg elemental Mg | 6,074–12,684 mg compound | 12–24 capsules at 545 mg fill | 9–18 capsules at 730 mg fill | 6–12 capsules at 1100 mg fill | 7,600 mg compound | 14 capsules at 545 mg fill | 11 capsules at 730 mg fill | 7 capsules at 1100 mg fill |
| 975 mg elemental Mg | 6,234–13,017 mg compound | 12–24 capsules at 545 mg fill | 9–18 capsules at 730 mg fill | 6–12 capsules at 1100 mg fill | 7,800 mg compound | 15 capsules at 545 mg fill | 11 capsules at 730 mg fill | 8 capsules at 1100 mg fill |
| 1000 mg elemental Mg | 6,394–13,351 mg compound | 12–25 capsules at 545 mg fill | 9–19 capsules at 730 mg fill | 6–13 capsules at 1100 mg fill | 8,000 mg compound | 15 capsules at 545 mg fill | 11 capsules at 730 mg fill | 8 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 aspartate form group has 15 audited capsule labels and the magnesium glycerophosphate group has 0; 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 aspartate | 46 | 15 | 13 | 2 | 0 |
| Magnesium glycerophosphate | 0 | 0 | 0 | 0 | 0 |
At 2026-08-10, magnesium aspartate has 13 of 15 audited capsule labels at or below 730 mg minimum compound mass per capsule, 2 above 730 mg but at or below 1100 mg, and 0 above 1100 mg. Its other 31 labels have no capsule verdict in this group, either because they are not classified as capsules or because a mass budget is unavailable.
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.
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 2 publications with magnesium aspartate and 0 with magnesium glycerophosphate; the combined list contains 2 unique publications, with shared records printed once.
| Salt | Publications | Publication years |
|---|---|---|
| Magnesium aspartate | 2 | 2001–2005 |
| Magnesium glycerophosphate | 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.
Published measurements · peer-reviewed sources
The 2026-09-11 literature review links these 2 publications, ordered newest first; study outcomes remain attached to their own experimental conditions.
These entries report what each study measured and on whom. They are not advice, not a ranking, and not a claim about any product on this site. Every reference links to its PubMed record so the original can be read in full.
8 of 46 labels mentioning magnesium aspartate 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 |
|---|---|---|---|
| Adaptogen Research Potassium MagnesiumNIH DSLD 247239 · label 2021-05-22 | Single salt unresolved as of 2026-10-17Tablet or Pill | 1 Tablet(s)100 mg elemental magnesium per serving | No published price matched to barcode 8 28054 77273 1 as of 2026-10-17. |
| AOR Advanced Orthomolecular Research Advanced Advanced Magnesium ComplexNIH DSLD 214423 · label 2020-02-26 | Single salt unresolved as of 2026-10-17Capsule | 1 Capsule(s)Elemental amount unresolved as of 2026-10-17 | No published price matched to barcode 6 24917 08333 0 as of 2026-10-17. |
| AOR Advanced Orthomolecular Research Premium Magnesium Potassium AspartatesNIH DSLD 214686 · label 2020-03-24 | Magnesium aspartateCapsule | 1 Capsule(s)Elemental amount unresolved as of 2026-10-17 | No published price matched to barcode 6 2497 08224 1 as of 2026-10-17. |
| BIOVEA Magnesium 200 mgNIH DSLD 249072 · label 2021-05-22 | Single salt unresolved as of 2026-10-17Capsule | 1 Vegetarian Capsule(s)200 mg elemental magnesium per serving | No published price matched to barcode 8 11079 03132 7 as of 2026-10-17. |
| Bronson Potassium & Magnesium AspartateNIH DSLD 9135 · label 2012-06-01 | Magnesium aspartateCapsule | 1 Capsule(s)21 mg elemental magnesium per serving | No published price matched to barcode 7 16563 25101 7 as of 2026-10-17. |
| BulkSupplements.com Magnesium D-AspartateNIH DSLD 310740 · label 2024-03-22 | Magnesium aspartatePowder | 680 mg (about 1/4 tsp)49 mg elemental magnesium per serving | $35.97 per container; cost per 100 mg not computedObserved 2026-09-11 · provisional (pack weight differs: the offer lists 250 g, the label 1000 g) |
| BulkSupplements.com Magnesium D-AspartateNIH DSLD 310742 · label 2024-03-22 | Magnesium aspartatePowder | 680 mg (about 1/4 tsp)49 mg elemental magnesium per serving | No published price matched to barcode X00191LG7V as of 2026-10-17. |
| BulkSupplements.com Magnesium D-AspartateNIH DSLD 310743 · label 2024-03-22 | Magnesium aspartatePowder | 680 mg (about 1/4 tsp)49 mg elemental magnesium per serving | No published price matched to barcode X0018VO6HJ 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 aspartate matches and 0 verified magnesium glycerophosphate 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 aspartate has 0 verified matches and 3 pending matches in the price set. No verified median is available as of 2026-10-17. Observation dates: 2026-09-11 to 2026-10-26.
0 verified retail matches are published for magnesium aspartate as of 2026-10-17.
These candidate retail-to-label matches remain separate from verified rows and are not included in verified medians.
| BulkSupplements.com | Magnesium D-AspartateNIH DSLD · Label 310740 | 49 mg | 1,471 | $35.97Per container · Price observed 2026-09-11, Amazon | Not computedpack weight differs: the offer lists 250 g, the label 1000 g | Pending · provisional |
| Swanson | Magnesium AspartateNIH DSLD · Label 308656 | 133 mg | 90 | $14.84Per container · Price observed 2026-09-11, Amazon | Not computedthe offer is a multi-pack (2 packs) | Pending · provisional |
| NOW | Magnesium & Potassium AspartateNIH DSLD · Label 204986 | 250 mg | 60 | $29.62Per container · Price observed 2026-10-26, Amazon | Not computedthe offer is a multi-pack (2 packs) | Pending · provisional |
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.
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.