Published lab tests
Published lab tests
We aggregate 16 published tests across 6 supplement verticals. Every result is attributed to the organization that conducted it, with a date and source link. We do not run the tests.
Key Takeaways
- We aggregate 16 published lab tests across 6 supplement verticals: 10 ingredient-level studies and 6 per-brand product tests.
- Every test is attributed to the organization that conducted it, with the publication or observation date and a direct link to the source.
- We do not run any of these tests. We are not a laboratory. We present public findings with full attribution.
- Ingredient-level studies describe quality patterns across the category, not a single product. Per-brand tests apply only to the specific product and lot tested.
- An allegation is noted where a finding is disputed or has not been independently confirmed.
Aggregated results
All published lab tests by supplement
Each entry shows: what was tested, the result, who conducted the test, the date, and a link to the original source. Click a supplement name to see the full page for that vertical.
Comparative heavy-metal chart of magnesium supplements found no uncontaminated magnesium glycinate product as of September 2025. CALM Magnesium Citrate Gummy was the only product with non-detect results for all four metals. Products testing positive for lead include Pure Encapsulations Magnesium Glycinate, Nordic Naturals Magnesium Complex, and Doctor's Best High Absorption Magnesium. Organics Ocean Pure Magnesium Glycinate was described as the most heavily lead-contaminated tested. Tablet forms showed higher contamination on average than capsule forms.
47% of tested protein products exceeded California Prop 65 or other federal safety thresholds for at least one contaminant; 21% exceeded Prop 65 lead limits by 2x or more; plant-based protein powders showed 77% exceedance. Note: Prop 65 lead MADL is 0.5 mcg/day, roughly 25x stricter than the FDA adult reference level of 12.5 mcg/day; methodology disputed by CRN and NPA as non-peer-reviewed.
27 ppb lead detected in LMNT Raw Unflavored dry powder. This exceeds the 10 ppb action level in the 2021 Baby Food Safety Act and the FDA 5 ppb guidance for bottled water. LMNT has disputed the result; no independent replication has been published as of June 2026. This is a single-SKU advocacy test -- not a category-level survey -- and the finding remains disputed and unresolved.
Two products contained up to twice the vitamin D amount listed on the label, raising hypercalcemia risk at high chronic doses. Doses across tested products ranged from 960 IU to 6,760 IU per serving; cost per 25 mcg dose ranged from 1 cent to $1.75.
Two of 15 tested magnesium supplements received 'Not Approved' status because they appeared to contain a cheaper oxide form instead of the claimed glycinate or aspartate, based on the ratio of listed ingredient to actual elemental magnesium measured. Serving sizes ranged from 76 mg to 500 mg; cost per 200 mg varied from $0.02 to over $1.00.
Roughly half of tested creatine gummies failed to meet label claim; several contained mostly creatinine (degraded creatine) rather than creatine. Large amounts of creatinine detected.
Roughly half of tested creatine gummies failed to meet label claim; several contained mostly creatinine (degraded creatine) rather than creatine. Large amounts of creatinine detected.
Roughly half of tested creatine gummies failed to meet label claim; several contained mostly creatinine (degraded creatine) rather than creatine. Minimal creatine found; near-total conversion to creatinine.
Roughly half of tested creatine gummies failed to meet label claim; several contained mostly creatinine (degraded creatine) rather than creatine. Large amounts of creatinine detected.
Roughly half of tested creatine gummies failed to meet label claim; several contained mostly creatinine (degraded creatine) rather than creatine. Minimal creatine found; near-total conversion to creatinine.
Roughly half of tested creatine gummies failed to meet label claim; several contained mostly creatinine (degraded creatine) rather than creatine. Minimal creatine found; near-total conversion to creatinine.
5 of 16 products had more than double the sodium and/or potassium claimed on the label. 11 of 16 products would fail to achieve effective mineral concentrations per ACSM and NATA guidelines. One product failed lead contamination screening. One product would fail arsenic screening at just 2 servings per day under California Prop 65 safe harbor levels. Only approximately 5 products met both efficacy and safety standards.
83% of tested products exceeded international peroxide value limits; 50% exceeded TOTOX limits; only 8% met all three oxidation standards. 69% contained less than 67% of labeled EPA+DHA.
50% of products exceeded voluntary recommended levels for at least one oxidation marker; 41% had anisidine values above 20; 39% had TOTOX above 26. Replicates Albert et al. across a larger North American product set.
OTC vitamin D pills contained 52% to 135% of the labeled dose. Compounded tablets ranged from 9% to 146% of label. Just over half of OTC pills and only one-third of compounded pills met USP Convention potency standards. Variation occurred not only across brands but across individual pills within the same bottle. The single bottle from a USP-verified manufacturer was substantially more accurate than all others.
All 15 products contained detectable levels of at least one heavy metal; three products (EAS Myoplex Original Rich Dark Chocolate, Muscle Milk Chocolate, Muscle Milk Vanilla Creme) exceeded proposed daily safety limits at 3 servings/day.