CheckVegan

Is Hydroxyisoleucine vegetarian?

Hydroxyisoleucine

Vegetarian Vegetarian
Vegan Vegan

Hydroxyisoleucine is a hydroxylated derivative of the amino acid isoleucine, notably found in fenugreek seeds and used as a cosmetic active ingredient, typically produced synthetically.

Also known as (4S)-4-Hydroxy-L-Isoleucine
INCI name Hydroxyisoleucine
CAS number 55399-93-4
CosIng ID 56813
Last reviewed 9 July 2026

An ingredient is considered vegetarian if it avoids components derived from killing an animal.

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.

Report an issue