Form · as filed on labels
Magnesium L-threonate
Magnesium L-threonate is 8.25% elemental magnesium by mass (Mg(C₄H₇O₅)₂, molar mass 294.5). Every 100 mg of elemental magnesium from it needs 1,212 mg of the compound, calculated 2026-09-13. 4 on-market labels name this form. Median filed amount is 144 mg elemental magnesium per serving across 4 computed labels.
Chemistry · fixed
How much L-threonate carries how much magnesium
A US Supplement Facts panel declares the element, not the salt. Magnesium L-threonate has a molar mass of 294.5 against magnesium's 24.305, so 8.25% of its mass is magnesium.
| Elemental magnesium | L-threonate required | Size 00 capsules that much powder fills |
|---|---|---|
| 100 mg | 1,212 mg | 2 |
| 200 mg | 2,424 mg | 4 |
| 400 mg | 4,848 mg | 7 |
A size 00 capsule holds about 730 mg of powder at powder density 0.6–0.8 g/mL; a size 000 about 1,100 mg.
Mass budget across this form · computed
1 of 3 capsule labels naming this form exceed every standard capsule
| Fits a size 0 or 00 capsule | 2 |
|---|---|
| Requires the largest standard size, 000 | 0 |
| Exceeds every standard capsule | 1 |
Counted only for capsule labels naming this salt alone. Full method and the corpus-wide figure: label mass-budget audit.
Median and range use the 4 labels with one determinable amount per serving, excluding any above 1,000 mg as filed. 2 of these labels carry an observed price in the gold set. This form has no priced EC100 table yet.
Labels filing this form 4
| Dr. Mercola | Magnesium AdvancedNIH DSLD · Label 327131 · Capsule | threonate | 145 mg | 30 | 4.35 g | Pending verification |
| Nootropics Depot | Magtein Magnesium L-Threonate PowderNIH DSLD · Label 232390 · Powder | threonate | 144 mg | 60 | 8.64 g | Not tracked yet |
| Protocol For Life Balance | Magtein Magnesium L-ThreonateNIH DSLD · Label 326454 · Capsule | threonate | 144 mg | 30 | 4.32 g | Not tracked yet |
| Teraputics Pure Life | Magnesium L-ThreonateNIH DSLD · Label 245277 · Capsule | threonate | 144 mg | 25 | 3.60 g | Pending verification |
See all forms, brands, or the priced form matrix.
Compare L-threonate with other salts
13 published comparisons include magnesium l-threonate as of 2026-09-13; each row gives the other salt's magnesium fraction and compound mass for 100 mg elemental magnesium from the chemistry model.
- Magnesium L-threonate vs magnesium citrate: 11.3–16.16% magnesium by mass; 619–885 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium glycinate: 11.83–14.1% magnesium by mass; 709–845 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium oxide: 60.32% magnesium by mass; 166 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium malate: 13.2–15.54% magnesium by mass; 644–758 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium aspartate: 8.42% magnesium by mass; 1,188 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium carbonate: 24.78–28.83% magnesium by mass; 347–404 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium gluconate: 5.86% magnesium by mass; 1,706 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium chloride: 11.96–25.53% magnesium by mass; 392–836 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium taurate: 8.85% magnesium by mass; 1,130 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium hydroxide: 41.68% magnesium by mass; 240 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium orotate: 7.27% magnesium by mass; 1,376 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium lactate: 12.01% magnesium by mass; 833 mg compound per 100 mg elemental magnesium.
- Magnesium L-threonate vs magnesium sulfate: 9.86–20.19% magnesium by mass; 495–1,014 mg compound per 100 mg elemental magnesium.
Excipients most common in L-threonate labels
5 published excipient facets below have the highest frequencies among 9 labels mentioning magnesium l-threonate in the NIH DSLD records, counted 2026-09-13; each label enters an ingredient count once.
- hypromellose: 4 of 9 labels.
- microcrystalline cellulose: 3 of 9 labels.
- silicon dioxide: 3 of 9 labels.
- ascorbyl palmitate: 2 of 9 labels.
- cellulose: 2 of 9 labels.
The metric
What EC100 measures
EC100 = container price ÷ (elemental mg per serving × servings per container ÷ 100)
It normalizes the declared elemental amount to a 100 mg unit. It does not score ingredients, quality, or outcomes.