Grade: C

MEDIUM RISK

ON Optimum Nutrition

Item: ON Optimum Nutrition
Rating: 50
Author: SupplementChecker

ON Optimum Nutrition has a SupplementChecker.co trust score of 50/100, a grade of C, and a risk level of MEDIUM. ON Optimum Nutrition does not appear to have any third-party testing certifications. While the brand has a clean FDA record, the lack of independent verification may be a concern for some consumers.

ON Optimum Nutrition Trust Summary

Trust Score: 50/100 (Fair)
Grade: C
Risk Level: MEDIUM
Third-Party Tested: No
FDA Recalls: 0
Adverse Events: 0

ON Optimum Nutrition has a trust score of 50/100 (Fair). The brand is not third-party tested by NSF, USP, or Informed Sport, has no FDA recalls on record and no adverse event reports.

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Red Flags

⚠No third-party testing certifications found
⚠No GMP certification visible

Verified Strengths

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

Certifications

No certifications on record. This brand has not demonstrated GMP compliance or third-party testing verification.

FDA Record

FDA Warning Letters

Recalls

Adverse Reports

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

Is ON Optimum Nutrition Third-Party Tested?

No — ON Optimum Nutrition is not currently third-party tested by independent certifiers like NSF, USP, or Informed Sport. No GMP certification was found on record either. 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 ON Optimum Nutrition a Good Brand?

ON Optimum Nutrition scores 50/100 (C) — this is a below-average score. We recommend considering brands with third-party certifications like NSF or USP. ON Optimum Nutrition has a clean FDA record with no warnings or recalls. The brand does not currently hold third-party testing certifications.

About ON Optimum Nutrition

ON Optimum Nutrition is a supplements brand operating independently in the US. The founding date is unknown. They offer a range of products in the supplement market. They are headquartered in the US.

Product Specialization

ON Optimum Nutrition focuses on supplements in the fish oil and protein categories. They are known for products like protein powders and fish oil capsules.

Testing & Certifications Explained

ON Optimum Nutrition does not appear to have any third-party testing certifications. This means that no independent organization has verified the quality, purity, or potency of their products. Consumers seeking third-party tested supplements may want to consider other brands with verifiable certifications.

How ON Optimum Nutrition Compares

Many brands in the protein and fish oil categories, such as NOW Foods (trust score 75/100) and Garden of Life (trust score 82/100), pursue third-party certifications to demonstrate product quality. These certifications provide an extra layer of assurance for consumers. ON Optimum Nutrition's lack of certifications places it behind competitors in terms of verified trust.

Buying Guidance

Given the absence of third-party testing, consumers should carefully evaluate ON Optimum Nutrition reviews and consider purchasing from retailers with strong return policies. Verify product seals upon arrival and contact ON Optimum Nutrition directly with any questions about product quality or testing.

Frequently Asked Questions

Has ON Optimum Nutrition had any recalls?

No — as of 2026, ON Optimum Nutrition has zero FDA product recalls on record. They maintain a clean FDA record with no warning letters or significant adverse event reports. ON Optimum Nutrition received a trust score of 50/100 from SupplementChecker.

Are ON Optimum Nutrition supplements third-party tested?

No — ON Optimum Nutrition supplements are not currently third-party tested by independent certifiers like NSF, USP, or Informed Sport. No independent testing or GMP certification was found on record.

Is ON Optimum Nutrition safe?

ON Optimum Nutrition received a trust score of 50/100 (grade: C, 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 ON Optimum Nutrition a good brand?

ON Optimum Nutrition scores 50/100 (grade: C) — this is below average. We recommend looking for brands with third-party certifications like NSF or USP. 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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