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Mushroom CoffeeTrust Score: 45

Four Sigmatic

Facts-only compliance record. Every entry is source-backed and dated.

Last reviewed: 2026-04-15

45

Trust Index Score

Four Sigmatic — Concerning Gaps

2Major
1Moderate

Event Timeline

GapModerate

Mushroom doses at 25% of clinical minimum per species

250mg lion's mane + 250mg chaga per species = approximately 25% of the minimum clinically studied effective dose. Per-species doses are individually disclosed. Uses 100% fruiting body dual extract.

Four Sigmatic Supplement Facts Label
LabMajor

Lead found in Think Organic Coffee despite batch testing claims

Lead Safe Mama / Tamara Rubin found lead in Four Sigmatic's Think Organic Coffee in August 2024, despite the brand claiming every batch tests below 0.5 ppm. This represents a 6-year recurring lead problem (2018-2024).

Lead Safe Mama — Four Sigmatic Testing
Prop 65MajorResolved

Prop 65 notice for lead contamination

California Prop 65 60-day notice (CA DOJ 2018-01102) filed for lead contamination in Four Sigmatic products. A settlement was subsequently reached.

CA AG Prop 65 60-Day Notice Database

About this record

The Evident Caselog documents publicly available regulatory actions, consumer complaints, independent lab findings, and testing gaps for health brands. Every entry links to its primary source. We do not editorialize or imply intent — only facts that can be independently verified.

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