Ester-C

Part of Nestle Health Science

Ester-C is a vitamin C and immune support supplement brand owned by Nestle Health Science that holds GMP certification. The brand has a clean FDA record with no warning letters or recalls, though 16 adverse event reports have been filed. Notable concerns include the absence of third-party testing certifications and lack of published lab results for transparency verification.

Red Flags

⚠No third-party testing certifications found

Certifications

GMP Certified

FDA Record

Warning Letters

Recalls

Adverse Reports

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 FDA 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, NSF.org, USP.org, and publicly available brand information. Last updated: 3/20/2026.