Diglycerin is a polyglycerol (glycerin dimer) used as a moisturizing humectant and skin-conditioning agent that attracts and retains water in the skin. It is considered a base/formulation ingredient rather than a treatment active and is valued for being mild and less sticky than glycerin.
| Reported effect | How often | Notes |
|---|---|---|
Mild transient stinging or irritation | Rare | Generally well tolerated; rare mild reactions usually on compromised or sensitive skin |
Contact allergy/sensitization | Very rare | Polyglycerols are low-sensitizing; documented allergic reactions are exceptional |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.