Brand · NIH DSLD snapshot 2026-08-10
tnvitamins magnesium supplements: 4 products in 4 forms, 180–420 mg of magnesium per serving
4 tnvitamins magnesium products in 4 forms, led by oxide (2); median 300 mg of magnesium per serving. Inside: each product's mg and price.
tnvitamins files 4 on-market magnesium labels in NIH DSLD using 3 salts, most often citrate (1 of 4); 0 of 2 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 300 mg per serving; 2 of 4 labels have a matched US price as of 2026-11-02. Snapshot 2026-08-10.
computed from filed labels
Chart data
| Displayed chart text |
|---|
| citrate |
| 1 |
| glycinate |
| oxide |
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 2 audited capsule labels are above the assumed size 000 capacity at powder density 0.8 g/mL, against 8 of 137 across the registry. 1 fit size 0 or 00 and 1 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 |
|---|
| tnvitamins |
| fits 1 of 2 |
| needs 000 1 of 2 |
| exceeds 0 of 2 |
| all audited |
| fits 82 of 137 |
| needs 000 47 of 137 |
| exceeds 8 of 137 |
| Verdict | tnvitamins | All audited capsule labels |
|---|---|---|
| Fits size 0 or 00 | 1 of 2 | 82 of 137 |
| Needs size 000 | 1 of 2 | 47 of 137 |
| Exceeds size 000 | 0 of 2 | 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 tnvitamins use, and how much compound does each need?
tnvitamins files 3 salts, most often citrate (1 of 4) across 4 labels; for 100 mg of magnesium the lightest of them needs 166 mg of compound against 885 mg for the heaviest.
computed| Salt | Labels | Elemental fraction | Compound per 100 mg Mg |
|---|---|---|---|
| citrate | 1 | 11.3–16.2% | 619–885 mg |
| glycinate | 1 | 11.8–14.1% | 709–845 mg |
| oxide | 1 | 60.3% | 166 mg |
Source · NIH DSLD labels · snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How do tnvitamins' prices compare within each salt?
2 of 4 tnvitamins labels have 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 |
|---|---|---|---|---|
| tnvitamins Magnesium Glycinate 300 mg | glycinate | $0.0962 | $0.1889 | 2026-11-02 |
| tnvitamins Magnesium Oxide 420 mg | oxide | $0.0258 | $0.0293 | 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 tnvitamins?
The FDA enforcement data queried 2026-10-19 holds 2 recall records naming tnvitamins, 0 of them about a magnesium product. CAERS holds no report naming the brand as of 2026-10-19, against 143 of 273 brands here that have any.
measured| Recall | Date | Reason | Status |
|---|---|---|---|
| H-0942-2026 | 2026-06-17 | Product may be contaminated with Salmonella. | Ongoing |
| H-1185-2026 | 2026-07-29 | Contaminated with Salmonella | Ongoing |
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 tnvitamins' labels, and what do they declare?
4 of 4 tnvitamins labels list magnesium stearate, 3 use a gelatin shell and 0 a cellulose shell; 5 distinct filed declarations appear across them. Listed ingredients are filed names, not quantities.
measured| Filed entry | Labels |
|---|---|
| magnesium stearate | 4 of 4 |
| gelatin | 3 of 4 |
| microcrystalline cellulose | 3 of 4 |
| dicalcium phosphate | 1 of 4 |
| silicon dioxide | 1 of 4 |
| Adult (18 - 50 Years) | 4 of 4 |
| Gluten Free | 3 of 4 |
| Dairy Free | 3 of 4 |
2 additional rows
| Filed entry | Labels |
|---|---|
| Sugar Free | 2 of 4 |
| No Allergies | 1 of 4 |
Source · NIH DSLD labels · snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which tnvitamins labels are on file, and what does each declare?
tnvitamins has 4 on-market labels in the NIH DSLD snapshot 2026-08-10, with a median declared amount of 300 mg of elemental magnesium per serving; each row opens the label's own arithmetic.
measured| Label | Declared per serving | Salt | Capsule verdict |
|---|---|---|---|
| tnvitamins Magnesium & Potassium Aspartate | 180 mg | not resolved | not computable |
| tnvitamins Magnesium Citrate 800 mg | Not one amount | citrate | not computable |
| tnvitamins Magnesium Glycinate 300 mg | 300 mg | glycinate | needs 000 |
| tnvitamins Magnesium Oxide 420 mg | 420 mg | oxide | needs 00 |
Source · NIH DSLD labels · snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method