A branch-chained, essential amino acid that can be found in things like almond, cashew or soy protein. When taken orally it may promote protein synthesis. As for skincare - like all the amino acids - it's a skin-identical ingredient and moisturizer. It also seems to be useful as a barrier repair ingredient.
Show me some proof
- Pediatric Allergy and Immunology, Volume 25, Issue 3, 13 JAN 2014, Local rhamnosoft, ceramides and L-isoleucine in atopic eczema: a randomized, placebo controlled trial