Label arithmetic · NIH DSLD snapshot 2026-08-10
How much magnesium is in magnesium sulfate? 9.9–20.2% by weight, so 100 mg of magnesium takes 495–1,014 mg of sulfate
9.9–20.2% of magnesium sulfate is magnesium: 100 mg takes 495–1,014 mg of salt, 0.7–1.4 size 00 capsules. No ranked US price (Nov 2).
Magnesium sulfate is 9.9–20.2% elemental magnesium, so 100 mg of magnesium needs 495–1,014 mg of compound, about 0.7–1.4 size 00 capsules at 0.8 g/mL powder density. No capsule label names magnesium sulfate alone as of 2026-08-10, so no capsule verdict is counted. No US retail price is matched as of 2026-11-02.
computed from chemical formula
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% |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-11-02 · chemistry 2026-10-17
Recompute for your bottle
Enter your container price, declared elemental amount and servings to calculate a price per 100 mg for this bottle.
Same-salt comparison appears here.
How much elemental magnesium is actually in 100, 200 or 400 mg of sulfate?
Magnesium sulfate is 9.9–20.2% elemental magnesium by mass (MgSO₄, molar mass 120.37). Magnesium sulfate has a molar mass of 120.37 against magnesium's 24.305, so 9.9–20.2% of its mass is magnesium. One caveat: anhydrous 20.2%, heptahydrate 9.9%, so the figures below are given as a range wherever that matters. Every 100 mg of elemental magnesium from it needs 495–1,014 mg of the compound, calculated 2026-10-17.
computedThe filed salt can have more than one hydration state, so its elemental fraction is shown as a range.
Chart data
| Displayed chart text |
|---|
| sulfate |
| 1,981 · 4,057 |
| oxide |
| 663 |
| Elemental magnesium | sulfate required | Size 00 capsules that much powder fills |
|---|---|---|
| 100 mg | 495–1,014 mg | 1–2 size 00 capsules (0.7–1.4 capsules' worth of powder) |
| 200 mg | 991–2,028 mg | 2–3 size 00 capsules (1.4–2.8 capsules' worth of powder) |
| 400 mg | 1,981–4,057 mg | 3–6 size 00 capsules (2.7–5.6 capsules' worth of powder) |
anhydrous 20.2%, heptahydrate 9.9%
Source · Chemical formula and atomic masses · Calculated 2026-08-10; powder density 0.8 g/mL, the top of the usual 0.6–0.8 range · release 2026-08-10-f441aa9f · CSV · method
Estimated salt mass versus assumed capsule capacity
No capsule label names magnesium sulfate alone as of 2026-08-10, so no capsule verdict is counted. The 4 labels naming this form remain in the full registry.
computed with assumptionNo capsule label naming sulfate alone can be checked against capsule sizes in this snapshot.
| Mass budget verdict | Labels |
|---|---|
| Capsule labels naming this salt alone | None as of 2026-08-10 |
A size 00 capsule holds about 730 mg of powder at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range; a size 000 about 1,100 mg.
Source · NIH DSLD labels; mass balance · Recognized salt only; 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is a label called sulfate really sulfate, or mixed with another salt?
No on-market label names sulfate in the NIH DSLD snapshot 2026-08-10, so no blend count is computed. Open the full label list to inspect the source registry.
measuredA defined molecular formula permits a calculated fraction.
| Other named form | Labels |
|---|---|
| No other named form | 0 labels reviewed |
Source · NIH DSLD magnesium rows · Labels naming this salt; 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
I need 200 mg of actual magnesium. What changes in compound weight and capsules between sulfate and other forms?
For 200 mg of elemental magnesium, sulfate needs 991–2,028 mg of compound, against oxide at 332 mg. Size 00 holds about 730 mg at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range. Each row uses the stated elemental fraction; hydration ambiguity stays a range, and any price comparison remains within a single salt.
computed with assumption| Salt | Elemental fraction | Compound for 200 mg | Size 00 capsules |
|---|---|---|---|
| Magnesium sulfate | 9.9–20.2% | 991–2,028 mg | 2–3 size 00 |
| Magnesium glycinate | 11.8–14.1% | 1,418–1,691 mg | 2–3 size 00 |
| Magnesium citrate | 11.3–16.2% | 1,238–1,770 mg | 2–3 size 00 |
| Magnesium oxide | 60.3% | 332 mg | 1 size 00 |
| Magnesium malate | 12.6–15.5% | 1,287–1,584 mg | 2–3 size 00 |
Source · Chemical formulas and capsule capacity · Calculated 2026-08-10; powder density 0.8 g/mL, the top of the usual 0.6–0.8 range · release 2026-08-10-f441aa9f · CSV · method
What does sulfate cost per 100 mg of elemental magnesium, and which label is cheapest by declared elemental magnesium?
No ranked price per 100 mg of declared elemental magnesium is available for sulfate as of 2026-11-02. No observed price is on review. The 0 recognized labels remain visible in the registry even where no US retail price is matched.
computedNo US retail price is matched to this salt as of 2026-11-02.
| Rank | Label | EC100 | Match and observation |
|---|---|---|---|
| No rank | No ranked offer | No EC100 matched | Checked 2026-11-02 |
Source · Amazon via licensed data provider · Unique ASIN and observation date; prices observed 2026-10-26 to 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method
What else is in sulfate labels, including stearate, shells and fillers?
0 named excipients appear in the top displayed list among 0 labels naming sulfate as of 2026-08-10. A listed ingredient is a filed name, not a quantified mass; open the underlying label to check context and capsule material.
measured| Filed ingredient | Labels |
|---|---|
| No normalized facet in this group | 0 labels reviewed |
Source · NIH DSLD full label ingredient fields · Labels naming this salt; 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What did studies measure about absorption and side effects for sulfate?
2 studies in our PubMed checked registry measured outcomes involving sulfate as of 2026-08-10. The table names each design and measured outcome, against no pooled comparison across different study methods. No study in our registry of 16 measured side effects for sulfate as of 2026-08-10.
measured2 studies in this registry measured outcomes involving sulfate.
| Year | Study design and measured outcome | PubMed |
|---|---|---|
| 2019 | Single-dose administration of 400 mg/70 kg magnesium as one of five compounds (magnesium sulfate, magnesium oxide, magnesium acetyl taurate, magnesium citrate, magnesium malate) to Sprague Dawley rats, with a control group, followed by time-dependent tissue and serum sampling. Time-dependent magnesium absorption profile (area under the curve) in serum; magnesium tissue penetration and concentration, including brain tissue; behavioral indicators (e.g., anxiety-related behavior) recorded in the animals. | PMID 29679349 |
| 2005 | Eighty male Wistar rats fed a magnesium-depleted diet for three weeks, then randomised into ten groups, each receiving a different magnesium salt labelled with a stable isotope. Stable isotopes allow absorption and retention to be traced directly rather than inferred from urine, across ten salts at once , the widest head-to-head comparison in the literature. | PMID 16548135 |
Source · PubMed checked study registry · Registry checked 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels file sulfate, and how much do they declare per serving?
0 labels name sulfate as of 2026-08-10; none has a computable elemental amount per serving under this model. The full list keeps every filed label and explains missing calculations.
measured| Label | Declared elemental per serving | NIH DSLD |
|---|
Source · NIH DSLD on-market labels · Labels naming this salt; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Where do these numbers come from, and how do I cite or correct them?
The 0 recognized sulfate labels come from the NIH DSLD snapshot 2026-08-10. Chemistry was calculated from molecular formulas on 2026-10-17; observed retail prices are checked 2026-11-02. The linked CSV carries only values displayed on this page. Cite the release and report a claim if a filed label or calculation needs correction.
computed| Layer | Source and date |
|---|---|
| Labels | NIH DSLD snapshot 2026-08-10 |
| Chemistry | Formula calculation 2026-10-17 |
| Retail | Prices observed 2026-10-26 to 2026-11-02 |
Source · NIH DSLD; chemical formulas; Amazon via licensed data provider · Release 2026-08-10-f441aa9f · release 2026-08-10-f441aa9f · CSV · method