What does 21 CFR part 173 cover?

21 CFR part 173 is Secondary Direct Food Additives Permitted in Food for Human Consumption. It runs to 57 sections across 4 subparts and sits in subchapter B of chapter I, Food for Human Consumption.

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21 CFR Part 173: Secondary Direct Food Additives Permitted in Food for Human Consumption

Part 173 of title 21 runs to 57 sections across 4 subparts, and sits in subchapter B, Food for Human Consumption. Every section is reproduced in full and is current to 2026-09-10.

Sections: 57
Subparts: 4
Words of regulation: 15,620
Current to: 2026-09-10

Subpart A: Polymer Substances and Polymer Adjuvants for Food Treatment

Subpart B: Enzyme Preparations and Microorganisms

Subpart C: Solvents, Lubricants, Release Agents and Related Substances

Subpart D: Specific Usage Additives

Read 21 CFR part 173 at the eCFR · All of 21 CFR for food safety

Questions

What does 21 CFR part 173 cover?: 21 CFR part 173 is Secondary Direct Food Additives Permitted in Food for Human Consumption. It runs to 57 sections across 4 subparts and sits in subchapter B of chapter I, Food for Human Consumption.

Every section of part 173 is a clause somebody has to produce evidence for at their next audit. Krolda maps supplier documents to the clause they satisfy in FSSC 22000, IFS Food and 21 CFR 117, and routes the corrective action when the evidence is missing.

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Recall records come from the openFDA food enforcement API, published by the U.S. Food and Drug Administration in the public domain. Krolda adds the hazard classification and the clause mapping; neither is an FDA determination. Always check the FDA notice before acting on a recall.