Glycereth-18 at a glance

  • Synthetic, glycerin-based ingredient
  • Used as a humectant and skin-conditioning agent
  • Only needed in small concentration (up to 0.32%)
  • Ruled safe as used in cosmetics

Glycereth-18 description

Glycereth-18 is a synthetic glycerin-based ingredient used as a humectant (hydration-boosting agent) in skin care and other cosmetics formulations. It also functions as a skin-conditioning (moisturizing) agent. In 2021, the independent Cosmetic Ingredient Review Expert Panel deemed glycereth-18 safe as it is used in cosmetics. Their report looked at products using glycereth-18 in concentrations up to 0.32% maximum.

Glycereth-18 references

  • The Cosmetic Ingredient Review, January 2021, pages 1-16

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


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Not Rated