Is Sodium Hydroxide vegan?
Sodium Hydroxide
Sodium hydroxide, commonly known as caustic soda or lye, is a strongly alkaline inorganic compound produced industrially by the electrolysis of sodium chloride solution (chloralkali process). It is used in cosmetics as a pH adjuster and to saponify fats and oils.
| Also known as | Caustic Potash, Caustic Soda, Lye, NaOH, natrii hydroxidum, POTASSIUM HYDROXIDE / SODIUM HYDROXIDE, Sodium lye |
|---|---|
| INCI name | Sodium Hydroxide |
| E number | E524 |
| INS number | 524 |
| CAS number | 1310-73-2 |
| EC number | 215-185-5 |
| CosIng ID | 37890 |
| Last reviewed | 16 April 2026 |
An ingredient is considered vegan if it contains no animal-derived components at any point in its production.
Classifications are made to the best of our knowledge based on available scientific and regulatory sources. We cannot guarantee the accuracy of every entry, errors in the sources we draw from can always occur. This tool also cannot account for cross-contamination, which depends entirely on individual suppliers and producers. If you believe a classification is incorrect, you can report an issue.