Brand · NIH DSLD snapshot 2026-08-10
Natural Factors magnesium supplements: 5 products in 2 forms, 150–200 mg of magnesium per serving
5 Natural Factors magnesium products in 2 forms, led by citrate (4); median 150 mg of magnesium per serving. Inside: each product's mg and price.
Natural Factors files 5 on-market magnesium labels in NIH DSLD using 2 salts, most often citrate (4 of 5); 0 of 3 audited capsule labels are above the assumed size 000 capacity at powder density 0.8 g/mL, against 8 of 137 across the registry. Median declared amount 150 mg per serving; 1 of 5 labels has a matched US price as of 2026-11-02. Snapshot 2026-08-10.
computed from filed labels
Chart data
| Displayed chart text |
|---|
| citrate |
| 4 |
| glycinate |
| 1 |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-11-02 · chemistry 2026-10-17
Elemental: The magnesium itself; the rest of the compound weight is the partner molecule.
Size 000: The largest standard capsule, about 1,100 mg of powder at 0.8 g/mL, the top of the usual 0.6–0.8 range.
Estimated salt mass versus assumed capsule capacity
0 of 3 audited capsule labels are above the assumed size 000 capacity at powder density 0.8 g/mL, against 8 of 137 across the registry. 0 fit size 0 or 00 and 3 need size 000, at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range and the most favourable hydration.
computed with assumption
Chart data
| Displayed chart text |
|---|
| Natural Factors |
| fits 0 of 3 |
| needs 000 3 of 3 |
| exceeds 0 of 3 |
| all audited |
| fits 82 of 137 |
| needs 000 47 of 137 |
| exceeds 8 of 137 |
| Verdict | Natural Factors | All audited capsule labels |
|---|---|---|
| Fits size 0 or 00 | 0 of 3 | 82 of 137 |
| Needs size 000 | 3 of 3 | 47 of 137 |
| Exceeds size 000 | 0 of 3 | 8 of 137 |
Source · NIH DSLD labels; mass balance · recognized salt only; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which magnesium salts does Natural Factors use, and how much compound does each need?
Natural Factors files 2 salts, most often citrate (4 of 5) across 5 labels; for 100 mg of magnesium the lightest of them needs 619 mg of compound against 885 mg for the heaviest.
computed| Salt | Labels | Elemental fraction | Compound per 100 mg Mg |
|---|---|---|---|
| citrate | 4 | 11.3–16.2% | 619–885 mg |
| glycinate | 1 | 11.8–14.1% | 709–845 mg |
Source · NIH DSLD labels · snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How do Natural Factors' prices compare within each salt?
1 of 5 Natural Factors labels has a matched US price as of 2026-11-02; each is compared with the median of its own salt, never across salts, per 100 mg of declared elemental magnesium.
computed| Label | Salt | Per 100 mg | Same-salt median | Observed |
|---|---|---|---|---|
| Natural Factors Magnesium Bisglycinate 200 mg | glycinate | $0.1397 | $0.1889 | 2026-11-02 |
Source · Amazon via licensed data provider; NIH DSLD · unique ASIN × date; prices observed 2026-10-26 to 2026-11-02 · release 2026-08-10-f441aa9f · CSV · method
Does the FDA hold recall or adverse event records naming Natural Factors?
The FDA enforcement data queried 2026-10-19 holds 0 recall records naming Natural Factors, 0 of them about a magnesium product. CAERS holds adverse event reports naming the brand, as it does for 143 of 273 brands here; openFDA states that “there is no certainty that the reported event (adverse event) was actually due to the product” and that reports “cannot be used to estimate the incidence of these events.”
measured| Recall | Date | Reason | Status |
|---|---|---|---|
| No record as of 2026-10-19 |
FDA record register and matching method
Source · openFDA enforcement and CAERS · queried 2026-10-19 · release 2026-08-10-f441aa9f · CSV · method
What else goes into Natural Factors' labels, and what do they declare?
4 of 5 Natural Factors labels list magnesium stearate, 3 use a gelatin shell and 1 a cellulose shell; 6 distinct filed declarations appear across them. Listed ingredients are filed names, not quantities.
measured| Filed entry | Labels |
|---|---|
| magnesium stearate | 4 of 5 |
| microcrystalline cellulose | 4 of 5 |
| citric acid | 2 of 5 |
| hydroxypropyl cellulose | 1 of 5 |
| stearic acid | 1 of 5 |
| xylitol | 1 of 5 |
| Adult (18 - 50 Years) | 5 of 5 |
| Gluten Free | 5 of 5 |
4 additional rows
| Filed entry | Labels |
|---|---|
| Dairy Free | 5 of 5 |
| Sugar Free | 5 of 5 |
| Vegan | 2 of 5 |
| Vegetarian | 2 of 5 |
Source · NIH DSLD labels · snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which Natural Factors labels are on file, and what does each declare?
Natural Factors has 5 on-market labels in the NIH DSLD snapshot 2026-08-10, with a median declared amount of 150 mg of elemental magnesium per serving; each row opens the label's own arithmetic.
measured| Label | Declared per serving | Salt | Capsule verdict |
|---|---|---|---|
| Natural Factors Magnesium Bisglycinate 200 mg | 200 mg | glycinate | not applicable |
| Natural Factors Magnesium Citrate 150 mg | 150 mg | citrate | needs 000 |
| Natural Factors Magnesium Citrate 150 mg | 150 mg | citrate | needs 000 |
| Natural Factors Magnesium Citrate 150 mg | 150 mg | citrate | needs 000 |
| Natural Factors Magnesium Citrate 150 mg Key Lime | 150 mg | citrate | not applicable |
Source · NIH DSLD labels · snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method