21 CFR § 582.1666
Propylene glycol
June 25, 2020
(a) Product. Propylene glycol.
(b) Conditions of use. This substance is generally recognized as safe (except in cat food) when used in accordance with good manufacturing or feeding practice.
[41 FR 38657, Sept. 10, 1976, as amended at 61 FR 19544, May 2, 1996]