Label arithmetic · NIH DSLD 244040
Klean Athlete Klean Magnesium: 120 mg of magnesium per capsule, 1–4 capsules a day
120 mg of magnesium per capsule; the label's 1–4 capsules a day give 120–480 mg. No US price matched (Nov 2). Inside: salt weight, capsule size.
Klean Athlete Klean Magnesium declares 120 mg of elemental magnesium per serving as glycinate, which needs 851–1,014 mg of magnesium glycinate in each capsule, against 1,100 mg in the largest standard capsule (size 000) at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range: it fits only that size. No US retail price matched as of 2026-11-02; 17 of the 73 glycinate labels in this registry have a matched price. NIH DSLD 244040, label dated 2021-02-25.
computed from the filed label
Chart data
| Displayed chart text |
|---|
| 545 mg |
| 730 mg |
| 1,100 mg |
| 851–1,014 mg of glycinate per capsule |
Data release 2026-08-10-f441aa9f · registry snapshot 2026-08-10 · latest price observation 2026-10-19 · chemistry 2026-10-17
Mass: 851–1,014 mg per capsule · Price: none matched · % DV: 29% vs 29%
Elemental: The magnesium itself; the rest of the compound weight is the partner molecule.
Compound: The whole salt, such as magnesium glycinate, that must physically fit in the capsule.
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; size 00 holds about 730 mg and size 0 about 545 mg.
Recompute with your price
Enter the price you paid; the declared amount and servings of this label are prefilled, so the result is the cost per 100 mg of elemental magnesium for your bottle.
Same-salt comparison appears here.
Will 120 mg of glycinate actually fit in one capsule, or do I need more than one?
Estimated salt mass versus assumed capsule capacity: Klean Athlete Klean Magnesium implies 851–1,014 mg of magnesium glycinate in each capsule to deliver 120 mg of elemental magnesium, against 1,100 mg in the largest standard capsule (size 000) at powder density 0.8 g/mL, the top of the usual 0.6–0.8 range. Verdict: needs size 000, read at the most favourable hydration and the most units per serving.
computed with assumption| Measure | Value |
|---|---|
| Elemental magnesium per serving | 120 mg |
| Units per serving | 1 |
| Magnesium glycinate per serving | 851–1,014 mg |
| Magnesium glycinate per capsule | 851–1,014 mg |
| Capsule capacity 0 · 00 · 000 | 545 · 730 · 1,100 mg |
| Verdict | Needs size 000 |
The filed salt can have more than one hydration state (bisglycinate; chelate hydration varies by supplier), so the compound mass is a range.
Source · NIH DSLD 244040 · label 2021-02-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
How much elemental magnesium is actually in this label's filed magnesium lines?
Klean Athlete Klean Magnesium files 1 magnesium line in NIH DSLD 244040; the selected primary line declares 120 mg of elemental magnesium per serving, against 0 other rows excluded from the primary amount. A salt named under another nutrient does not turn that nutrient's quantity into elemental magnesium.
measured| Filed amount | Salt or note as filed | Role |
|---|---|---|
| 120 mg | glycinate · Magnesium (Form: as Magnesium Glycinate) | Primary serving |
Source · NIH DSLD 244040 · label 2021-02-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Does this label's glycinate claim hold up, or could the magnesium come from another source?
The label names one magnesium form, glycinate, resolved from the filed magnesium line; at that salt the declaration is within the assumed size 000 capacity at powder density 0.8 g/mL, compared with oxide, the salt richest in magnesium at 60.3%.
computed with assumption| Form named on the label | Elemental fraction | Source |
|---|---|---|
| Magnesium glycinate | 11.8–14.1% | filed magnesium line |
Source · NIH DSLD 244040 · label 2021-02-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Is this a good price for the elemental magnesium I'm actually getting?
No US retail price is matched to this label as of 2026-11-02; 17 of 73 glycinate labels have one, against a median of $0.1889 per 100 mg among 17 ranked glycinate offers.
computed
Chart data
| Displayed chart text |
|---|
| n=17 |
| P25 $0.1338 |
| P75 $0.2216 |
| median $0.1889 |
| Rank | Label | Per 100 mg | Observed |
|---|---|---|---|
| 1 | Amazon Elements Chelated Magnesium 270 mg | $0.0666 | 2026-11-02 |
| 2 | Solgar Chelated Magnesium | $0.0930 | 2026-11-02 |
| 3 | tnvitamins Magnesium Glycinate 300 mg | $0.0962 | 2026-11-02 |
| 4 | New Chapter Magnesium + Ashwagandha | $0.1229 | 2026-11-02 |
| 5 | Windmill Magnesium Glycinate 200 mg | $0.1338 | 2026-11-02 |
| Median | 17 ranked glycinate offers | $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
How many days will this bottle last at the label's own serving, and what does a day cost?
At the label's own serving, Klean Athlete Klean Magnesium lasts 23–90 days: 90 servings against 1–4 servings a day in the filed directions.
computed| Measure | Value |
|---|---|
| Net contents as filed | 90 Vegetarian Capsule(s) |
| Serving size as filed | 1 Vegetarian Capsule(s) |
| Servings per container | 90 |
| Servings per day in the directions | 1–4 |
| Days per bottle | 23–90 days |
| $ per 30 days at one label serving a day | No ranked price as of 2026-11-02 |
| $ per 30 days at 420 mg Daily Value | No ranked price as of 2026-11-02 |
Source · NIH DSLD 244040 · label 2021-02-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What does "29% Daily Value" mean here, and does it recompute?
The label declares 29% Daily Value; 120 mg against the 420 mg reference in 21 CFR 101.9 recomputes to 29%, the same within one point.
computed| Group as filed | Declared | Reference | Recomputed |
|---|---|---|---|
| Adults and children 4 or more years of age | 29% | 420 mg | 29% |
Source · NIH DSLD 244040; 21 CFR 101.9 · label 2021-02-25 · release 2026-08-10-f441aa9f · CSV · method
Why does this label contain these other ingredients, what shell is it, and who is it filed for?
Klean Athlete Klean Magnesium files 2 other ingredients and a vegetarian shell, and no magnesium stearate, against 28 of 73 glycinate labels that list magnesium stearate.
measured| Entry | Filed ingredient or declaration |
|---|---|
| 1 | Hydroxypropyl Methylcellulose |
| 2 | Ascorbyl Palmitate |
| Shell | vegetarian |
| Target group | Adult (18 - 50 Years) |
| Target group | Gluten Free |
Source · NIH DSLD 244040 · label 2021-02-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
What has research measured about glycinate, and about side effects?
6 studies in the PubMed-checked registry measured outcomes involving glycinate; 2 mention gastrointestinal or adverse outcomes. They measured the salt, not this label.
measured| Year | Study | PubMed |
|---|---|---|
| 2024 | Comparative Clinical Study on Magnesium Absorption and Side Effects After Oral Intake of Microencapsulated Magnesium (MAGSHAPE™ Microcapsules) Versus Other Magnesium Sources. | 39770988 |
| 2024 | The bioaccessibility and tolerability of marine-derived sources of magnesium and calcium. | 38608850 |
| 2020 | Dose-Dependent Absorption Profile of Different Magnesium Compounds | 30761462 |
Source · PubMed-checked study registry · registry checked 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Has this brand had FDA recalls or adverse event reports?
Klean Athlete has 0 FDA recall records matched by brand name in the enforcement data queried 2026-10-19. Klean Athlete has FDA CAERS adverse event reports on record at brand level, as do 143 of 273 brands in this registry; 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 recall record as of 2026-10-19 |
Source · openFDA enforcement and CAERS · queried 2026-10-19 · release 2026-08-10-f441aa9f · CSV · method
Is this the same formula as another brand's, and how do their prices differ?
No other brand files the same formulation (ingredients, shell, units and rounded amount) as of 2026-11-02.
computed| Label | Brand | Price per 100 mg |
|---|---|---|
| No cross-brand match as of 2026-11-02 |
Source · NIH DSLD 244040 · label 2021-02-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Which labels are closest to this one, with the same salt and dose?
5 labels use the same resolved glycinate within ±10% of this label's 120 mg per unit, compared side by side on price and capsule verdict.
computed| Label | Elemental per unit | Price | Verdict |
|---|---|---|---|
| Puritan's Pride Magnesium Glycinate | 120 mg | No price | Needs size 000 |
| Country Life Magnesium Glycinate | 117 mg | No price | Capsule sizes do not apply |
| Metabolic Maintenance Magnesium Glycinate (DSLD 25018) | 125 mg | No price | Needs size 000 |
| Metabolic Maintenance Magnesium Glycinate (DSLD 274078) | 125 mg | $42.50 · 2026-11-02 | Needs size 000 |
| Integrative Therapeutics Magnesium Glycinate Plus | 110 mg | $29.25 · 2026-11-02 | Capsule sizes do not apply |
Source · NIH DSLD 244040 · label 2021-02-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
Where does this record come from, what is missing, and how do I cite or correct it?
Every value on this page traces to NIH DSLD 244040 (label 2021-02-25, snapshot 2026-08-10) and the chemistry model of 2026-09-13. 1 gap remain: No US retail price matched as of 2026-11-02 (barcode 3 10539 97907 5). The CSV carries the values shown here.
measured| Field | As filed |
|---|---|
| NIH DSLD label | NIH DSLD 244040 |
| Label date | 2021-02-25 |
| Date entered into DSLD | 2021-02-25 |
| Barcode (UPC) as filed | 3 10539 97907 5 |
| Manufactured for | Klean Athlete, Pittsburgh, PA, USA |
| Claim category as filed | All Other |
| Formulation re: Other | Nutritional Supplements |
| FDA Statement of Identity | Dietary Supplement |
10 additional rows
| Field | As filed |
|---|---|
| Seals/Symbols | NSF Certified Sport |
| Formulation re: Does NOT Contain | Gluten-free, Non-GMO |
| Suggested/Recommended/Usage/Directions | Suggested Usage: As a dietary supplement, adults take 1 capsule, 1-4 times daily, or as directed by a trainer, coach, or health professional. |
| Precautions re: Pregnant or Nursing or Prescription Medications | Warning: If you are pregnant or lactating, have any health condition or are taking any medication, consult your health professional before use. |
| Precautions re: Children | Keep out of the reach of children. |
| Storage | Store in a cool, dry place. |
| Precautions re: All Other | Use only if safety seal is intact. |
| General Statements: All Other Content | Contents may not fill package in order to accommodate required labeling. Please rely on stated quantity. Scan to learn about our Klean manufacturing and certifications |
| Physical state | Capsule |
| Registry snapshot | 2026-08-10 |
Source · NIH DSLD 244040 · label 2021-02-25; snapshot 2026-08-10 · release 2026-08-10-f441aa9f · CSV · method
6 brand pages linked below contain magnesium labels from the NIH DSLD registry snapshot dated 2026-08-10.