Propylene Glycol Alginate (E 405)

Last reviewed October 19, 2026

In plain words: Propylene glycol alginate (E 405) is a thickener made from seaweed. It is often used in salad dressings and beer foam.

What the evidence review says

Propylene glycol alginate is a thickener made from seaweed, often used in salad dressings and beer foam. We found no notable concern for it at normal food uses.

no notable concern

• Source: EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS), EFSA J, 2018 · doi:10.2903/j.efsa.2018.5371

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This page is for general education. It is not medical advice and does not replace advice from your doctor, pediatrician, allergist or registered dietitian. Research changes; we review these pages when new evidence or rules come out. Last reviewed October 19, 2026.