The Code of Federal Regulations (CFR) is the codification of the general and permanent regulations promulgated by the executive departments and agencies of the United States federal government. 

The CFR is divided into 50 titles representing broad areas subject to federal regulation. Food and drugs are mainly subjected to Title 21 Chapter I, including

Subchapter A General

Subchapter B Food for Human Consumption

Subchapter C Drugs: General

Subchapter D Drugs for Human Use

Subchapter E Animal Drugs, Feeds, and Related Products

Subchapter F Biologics

Subchapter G Cosmetics

Subchapter H Medical Devices

Subchapter I Mammography Quality Standards Act

Subchapter J Radiological Health

Subchapter K Tobacco Products

Subchapter LRegulations Under Certain Other Acts Administered by the Food and Drug Administration