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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 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 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 Grow Longer Stronger Anti-breakage Hair Mask Grow hair care Grow Longer Stronger Hair Mask Tenei Teinei Deep Hydrating Cream Anastasia Beverly Hills Eye Primer Kikumasamune Sake Skin Care Essence Kikumasamune Skin Care Essence (Old) Pacifica Cosmic Hemp Balancing Face Wash Rodan + Fields Smooth+ Shampoo 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 Umoua Advanced Extraction Isosmotic Tech Amino Acid Lotion Valmont Moisturizing Booster Votary Cleansing Oil the Cocoon The Cocoon Rose Serum Amika Color Vault Shampoo Amika Flash Instant Shine Hair Gloss Mask Ausceuticals Peptide Moisturiser Brickell Men's Products Daily Strengthening Shampoo For Men Brickell Men's Products Reviving Day Serum For Men Eva Naturals Peptide Complex Serum Facinnius Infinity One Kilig Vitamin Bomb Spray Conditioner Leaders Insolution Mediu Amino Pore-Tight Mask Maruderm Pore Minimizing Serum Maruderm Vitamin C Daily Glow Serum QRxLabs Peptide Complex Serum Terre mere Peptide And Pomegranate Cell Activating Serum Trulux Hyaluronic Serum