What it is
A small molecule found in some plants, such as comfrey, and also made synthetically. It is a common supporting ingredient in soothing and after-sun products.
On a Korean label
Written 알란토인, usually in the lower half of the list.
Korean rules
The Korean ingredient dictionary lists no limit, label caution or functional-ingredient status for it.
Questions
What is 알란토인 in English?
Allantoin.
Sources
Checked 26 October 2026. Rules change — the official texts above are the final word.