Grade: B+

MEDIUM RISK

Natural Factors

Item: Natural Factors
Rating: 70
Author: SupplementChecker

https://www.naturalfactors.com Est. 1955 (71 years)

Natural Factors has a SupplementChecker.co trust score of 70/100, which is a grade of B+ and indicates MEDIUM risk. Natural Factors does not appear to provide third-party testing certifications for its products. While Natural Factors is an established brand, consumers should be aware of the lack of third-party testing.

Natural Factors Trust Summary

Trust Score: 70/100 (Good)
Grade: B+
Risk Level: MEDIUM
Third-Party Tested: No
FDA Recalls: 0
Adverse Events: 2
Years in Business: 71 years
GMP Certified: Yes

Natural Factors has a trust score of 70/100 (Good). The brand is not third-party tested by NSF, USP, or Informed Sport, has no FDA recalls on record and 2 adverse event reports and has been in business for 71 years.

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Red Flags

⚠No third-party testing certifications found

Verified Strengths

✓Established brand — operating since 1955 (71 years)
✓Clean FDA record — no warnings, recalls, or significant adverse events

Certifications

GMP Certified

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

Is Natural Factors Third-Party Tested?

No — Natural Factors 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 Natural Factors a Good Brand?

Natural Factors scores 70/100 (B+) — this is an average score. There may be room for improvement in testing transparency or certifications. Natural Factors has a clean FDA record with no warnings or recalls. The brand does not currently hold third-party testing certifications.

About Natural Factors

Natural Factors is a supplement company founded in 1955. The company is independently owned and headquartered in the US. Natural Factors produces a wide range of supplements, including vitamins, minerals, herbs, and fish oil.

Product Specialization

Natural Factors specializes in a variety of supplement categories, including vitamins, minerals, herbs, and fish oil. They are known for offering a broad selection of single-ingredient supplements as well as combination formulas targeting specific health concerns.

Testing & Certifications Explained

Natural Factors is GMP certified, which means their manufacturing processes meet certain quality standards. However, Natural Factors does not appear to provide third-party testing certifications. This means that an independent laboratory has not verified the contents and purity of Natural Factors products. Consumers seeking third-party tested supplements should be aware of this.

How Natural Factors Compares

Compared to other brands in the supplement industry, Natural Factors' trust score of 70/100 places it in the middle range. For example, a brand like Thorne Research (trust score 92/100) has a higher score due to its extensive third-party testing and transparency. Alternatively, a brand like NOW Foods (trust score 75/100) also provides more third-party testing information. Consumers should compare Natural Factors' certifications and transparency practices with those of its competitors to make informed decisions.

Buying Guidance

Natural Factors products can be purchased from various online retailers and health food stores. Given that Natural Factors does not appear to be third-party tested, consumers should carefully review product labels and consider purchasing from retailers with strong return policies. Consumers concerned about the lack of third-party testing may want to consider brands that offer more comprehensive testing and transparency.

Frequently Asked Questions

Has Natural Factors had any recalls?

No — as of 2026, Natural Factors has zero FDA product recalls on record. They maintain a clean FDA record with no warning letters or significant adverse event reports. Natural Factors received a trust score of 70/100 from SupplementChecker.

Are Natural Factors supplements third-party tested?

No — Natural Factors 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 Natural Factors safe?

Natural Factors received a trust score of 70/100 (grade: B+, risk level: MEDIUM). This score is calculated from FDA records, third-party certifications, adverse event reports, and transparency practices. No FDA warnings or recalls are on record.

Is Natural Factors a good brand?

Natural Factors scores 70/100 (grade: B+) — this is an average score. There may be room for improvement in testing transparency or certifications. They do not currently hold third-party testing certifications like NSF, USP, or Informed Sport. No FDA warnings or recalls found.

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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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