Grade: B+

LOW RISK

Four Sigmatic

Item: Four Sigmatic
Rating: 75
Author: SupplementChecker

https://www.foursigmatic.com Est. 2012 (14 years)

Four Sigmatic has a SupplementChecker.co trust score of 75/100, which is a grade of B+ and indicates a LOW risk level. While Four Sigmatic is USDA Organic and GMP Certified, we found no evidence that their products are third-party tested for purity and potency. This is a key consideration for consumers looking for independently verified supplements.

Four Sigmatic Trust Summary

Trust Score: 75/100 (Good)
Grade: B+
Risk Level: LOW
Third-Party Tested: No
FDA Recalls: 0
Adverse Events: 0
Years in Business: 14 years
GMP Certified: Yes

Four Sigmatic has a trust score of 75/100 (Good). The brand is not third-party tested by NSF, USP, or Informed Sport, has no FDA recalls on record and no adverse event reports and has been in business for 14 years.

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Red Flags

⚠No third-party testing certifications found

Verified Strengths

✓Established brand — operating since 2012 (14 years)
✓Clean FDA record — no warnings, recalls, or significant adverse events
✓USDA Organic certified

Certifications

GMP CertifiedUSDA Organic

GMP certification ensures manufacturing quality standards are met, but does not verify that product contents match the label through independent testing. Look for NSF, USP, or Informed Sport certifications for third-party verified products.

FDA Record

FDA Warning Letters

Recalls

Adverse Reports

Clean record — no FDA warnings, recalls, or significant adverse events.

Is Four Sigmatic Third-Party Tested?

No — Four Sigmatic is not currently third-party tested by independent certifiers like NSF, USP, or Informed Sport. They do hold GMP certification, which ensures manufacturing quality but does not independently verify product contents. We recommend looking for brands with verified third-party testing for the highest confidence in product quality. See our guide to third-party tested supplements.

Is Four Sigmatic a Good Brand?

Four Sigmatic scores 75/100 (B+) — this is an average score. There may be room for improvement in testing transparency or certifications. Four Sigmatic has a clean FDA record with no warnings or recalls. The brand does not currently hold third-party testing certifications.

About Four Sigmatic

Four Sigmatic is an independent supplement company founded in 2012, offering a range of products focused on incorporating functional mushrooms and adaptogens into everyday routines. The brand is headquartered in the US and has become known for its innovative approach to wellness, particularly through its mushroom-infused coffees and elixirs.

Product Specialization

Four Sigmatic specializes in mushroom supplements, coffee, and adaptogens. They are particularly known for their mushroom coffee mixes, elixirs, and other products that incorporate ingredients like reishi, lion's mane, and chaga. These products are marketed for their potential cognitive and wellness benefits.

Testing & Certifications Explained

Four Sigmatic is USDA Organic certified, meaning that their products meet specific standards for organic farming and production practices. They are also GMP Certified, indicating adherence to good manufacturing practices for quality control. However, Four Sigmatic does not appear to provide evidence of third-party testing. This means that an independent laboratory has not verified the contents and purity of their supplements. Consumers seeking third-party tested supplements may want to consider other brands.

How Four Sigmatic Compares

Compared to competitors like Real Mushrooms (trust score 82/100) and Host Defense (trust score 68/100), Four Sigmatic falls in the middle range. Real Mushrooms distinguishes itself with published lab results and third-party testing, while Host Defense relies more on its USDA Organic certification. Consumers often compare Four Sigmatic reviews with those of these brands when evaluating mushroom supplement options.

Buying Guidance

When purchasing Four Sigmatic products, consider buying directly from their website or reputable retailers to ensure product authenticity. While Four Sigmatic is generally considered a safe brand, consumers should carefully review the ingredient list and consider their individual needs, especially given that it is unclear if Four Sigmatic is third-party tested. Always consult with a healthcare professional before starting any new supplement regimen.

Frequently Asked Questions

Has Four Sigmatic had any recalls?

No — as of 2026, Four Sigmatic has zero FDA product recalls on record. They maintain a clean FDA record with no warning letters or significant adverse event reports. Four Sigmatic received a trust score of 75/100 from SupplementChecker.

Are Four Sigmatic supplements third-party tested?

No — Four Sigmatic supplements are not currently third-party tested by independent certifiers like NSF, USP, or Informed Sport. They do have GMP (Good Manufacturing Practice) certification, which ensures manufacturing quality but does not independently verify product contents.

Is Four Sigmatic safe?

Four Sigmatic received a trust score of 75/100 (grade: B+, risk level: LOW). This score is calculated from FDA records, third-party certifications, adverse event reports, and transparency practices. No FDA warnings or recalls are on record.

Grade A+ • Higher score

Want more comparisons? Browse our supplement categories or check our buying guides.

How We Calculated This Score

Every brand starts with a baseline score of 70/100.

Points added for: Third-party certifications (NSF +15, USP +15, Informed Sport +10), publishing lab results (+10), clean regulatory record (+10), 10+ years in business (+10), organic certification (+5).

Points deducted for: FDA warning letters (-25), product recalls (-20), high adverse events (-15), no third-party testing (-15), proprietary blends (-10), no GMP (-10).

Score is capped at 0-100. Grade and risk level are derived from the final score.

All data sourced from FDA.gov, Health Canada (LNHPD / recalls-rappels), NSF.org, USP.org, and publicly available brand information. Last updated: 4/9/2026.

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Quick Facts

Trust Score: 75/100
Grade: B+
Risk Level: LOW
Third-Party Tested: No
FDA Recalls: 0
Adverse Reports: 0
Founded: 2012

⚠ No GMP certification visible