Propylene Glycol
Propylene Glycol
Also known as: 1,2-Propanediol · PG
HumectantSolvent
“A common humectant and solvent — effective but occasionally sensitising.”
What it does
Propylene glycol is a small diol molecule used as a humectant, solvent, and penetration enhancer. It draws moisture into the skin and helps deliver other actives more effectively. While generally safe, it is a known contact allergen in a small percentage of people, particularly at high concentrations.
Benefits
- Draws moisture to the skin
- Enhances penetration of other active ingredients
- Helps maintain product texture and stability
How to layer
☀️ Morning routine
Cleanser
Toner
Serum
Moisturiser
SPF
🌙 Evening routine
Cleanser
Toner
Serum
Moisturiser
Face Oil
After cleansing, on damp skin, before serums
Good for
Normal skinOily skinCombination skin
Works well with
Heads up
- ⚠Can cause contact dermatitis in sensitive or allergic individuals
- ⚠At high concentrations may be irritating to broken or eczema-prone skin
How to use
Used as a supporting ingredient. If you notice sensitivity, switch to propylene glycol-free formulations.
Typical concentration: 2–20% in leave-on products