Is Octamethylcyclotetrasiloxane vegan?

Octamethylcyclotetrasiloxane (D4) is a synthetic cyclic siloxane used historically in cosmetics, hair conditioners and moisturising creams; it is now classified as a substance of very high concern in the EU and restricted in personal care products due to persistence and bioaccumulation concerns.

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.