Registered Dietitian (CDR) Certification Exam

Registered Dietitian (CDR) The Credential Dietetics Registry (CDR) credential is the only nutrition certification recognized by law in most U.S. states—employers and clients alike know RD initials signal rigorous training in medical nutrition therapy, biochemistry, and food science fundamentals. This distinction matters non-credentialed nutrition advisors operate in a legal gray zone, while registered dietitians practice within defined scope and accountability standards that protect public health.