StacksVerified U.S. regulatory reference

21 CFR §173.220

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
1,3-Butylene glycol (1,3-butanediol) may be safely used in food in accordance with the following prescribed conditions:
  1. (a)The substance meets the following specifications:
    1. (1)1,3-Butylene glycol content: Not less than 99 percent.
    2. (2)Specific gravity at 20/20 °C: 1.004 to 1.006.
    3. (3)Distillation range: 200°-215 °C.
  2. (b)It is used in the minimum amount required to perform its intended effect.
  3. (c)It is used as a solvent for natural and synthetic flavoring substances except where standards of identity issued under section 401 of the act preclude such use.