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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

Products with Isoleucine

Luxros Advance Eyelash Serum Sisters Nourishing Conditioner Terez&Honor Lash Serum VieBeauti Eyelash Serum VieBeauti Eyelash Serum Sérum Pour Les Cils ISDIN Nutratopic Crema Facial Peter Thomas Roth Unisex Neuroliquid Volufill Youth Serum klorane baby Klorane Bebe Protective Baby Powder Dives med Amino Age Kikumasamune Sake Brewing Skin Care Lotion Bright Moist Leven Rose Coffee Eye Lift Cream klorane baby Klorane Baby Gentle Cleansing Wipes Atypical Skincare Glow Tonic ISDIN Nutratopic Pro-Amp Loción Corporal Emoliente The Ordinary Natural Moisturizing Factors + HA For Scalp Victoria DeAnn Pepti Acne Amika Vault Color Lock Leave In Conditioner The Ordinary Marine Hyaluronics Copenhagen Grooming The Activator Danielle Creations Brighten + Hydrate Face Sheet Mask Grow Longer Stronger Anti-breakage Hair Mask Grow hair care Grow Longer Stronger Hair Mask Kristin Ess Ultra Hydrating Curl Repair Mask Tenei Teinei Deep Hydrating Cream Algo Vita Glycolic Acid 7% + Adenosine Toner Anastasia Beverly Hills Eye Primer Be Minimalist Maleic Bond Repair Complex 05% Hair Serum ICE-Professional Refill My Hair Aqua Booster Kikumasamune Sake Skin Care Essence Kikumasamune Skin Care Essence (Old) Kikumasamune Skincare Essence Na5 Kristin Ess Moisture Rich Curl Shampoo Pacifica Cosmic Hemp Balancing Face Wash Rodan + Fields Smooth+ Shampoo The fair the fair. Days Long Collagen Serum minimalist Bond Repair Complex Clear Skin Collective Pink Bunny Slippers Hydration Mask Ducray Dexyane Ultra Rich Cleansing Gel Elizabeth Grant Youth Molecule Serum Fruto Salvaje Hair Loss Tonic Capilar Anticaida Holifrog Amino Cushion Cream Maruderm Caffeine %5 + Peptides + Hyalüronik Asit Göz Çevresi Serumu Perfect Diary Amino Acid Facial Cleanser The Ordinary Natural Moisturizing Factors + Ha The Ordinary Natural Moisturizing Factors + Phytoceramides Moisturizer Umoua Advanced Extraction Isosmotic Tech Amino Acid Lotion Valmont Moisturizing Booster Vis Plantis Secret Garden Amino Acid Face Tonic For Sensitive And Dry Skin Votary Cleansing Oil the Cocoon The Cocoon Rose Serum