Propylene glycol (PG) is a synthetic liquid substance.
## Uses
1. *Humectant*: Propylene glycol is used as a humectant in various products, including cosmetics, pharmaceuticals, and food.
2. *Solvent*: It's used as a solvent for flavorings, colorings, and other ingredients.
3. *Antifreeze*: Propylene glycol is used in antifreeze formulations.
4. *E-cigarettes*: It's sometimes used as a base in e-liquids.
## Properties
1. *Moisturizing*: Propylene glycol helps retain moisture in products.
2. *Colorless and odorless*: It's typically colorless and odorless.
## Safety
1. *Generally recognized as safe (GRAS)*: Propylene glycol is considered safe for use in food and cosmetics by regulatory agencies.
2. *Potential skin irritation*: Some individuals may experience skin irritation or allergic reactions.
