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E1520Glazing agentLow concern
Propylene Glycol
In plain words
The short version
A versatile humectant and carrier solvent — common in cake icings, flavor extracts, and e-cigarette liquids.
Why it's green
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Safety profile
ADI of 25 mg/kg body weight. Generally well-tolerated. Metabolized to lactic acid and excreted; very different toxicity profile from ethylene glycol. Caution at high intake for infants (limited metabolic capacity) and for cats (specific feline toxicity, not human).
The detail
Educational information only. Not medical or dietary advice.