Isoleucine
Isoleucine is a skin conditioning and hair conditioning ingredient. It’s in 69 products on Poliage, most often conditioner, body lotion and serum. Avoid lists on Poliage that include it: none.
Updated October 22, 2026
In plain English
Isoleucine: used to make hair smoother and easier to comb and reduce static in hair.
What it does
Contains Isoleucine: antistatic
Function listed in CosIng
Contains Isoleucine: hair-conditioning
Function listed in CosIng
Contains Isoleucine: skin-conditioning
Function listed in CosIng
Source: CosIng, the European Commission cosmetic ingredient database, ref 34662, accessed October 22, 2026.
Products that contain Isoleucine
The Ordinary
Multi-Peptide + HA Serum
Serum · None of Poliage’s flag groups listed
The Ordinary
Natural Moisturizing Factors + HA
None of Poliage’s flag groups listed
Olaplex
No. 8 Bond Intense Moisture Mask
Lists fragrance, fragrance allergens, drying alcohol, silicones
JVN
Nurture Hydrating Conditioner
Conditioner · Lists fragrance, fragrance allergens, essential oils
Olaplex
º7 SHINE SERUM OIL MIST
Hair styling · Lists fragrance, fragrance allergens, exfoliating acid, essential oils, silicones
Medicube
PDRN Wrapping Mask
Mask · Lists essential oils
R+Co
PRIMARY COLOR CONDITIONER
Conditioner · Lists fragrance, fragrance allergens, essential oils
R+Co
PRIMARY COLOR SHAMPOO
Shampoo · Lists fragrance, fragrance allergens, essential oils
Drunk Elephant
Protini Polypeptide Cream - Big
Moisturizer · Lists coconut derivatives
Drunk Elephant
Protini Polypeptide Firming Refillable Moisturizer
Moisturizer · Lists coconut derivatives
Drunk Elephant
Protini Powerpeptide Resurfacing Serum with Lactic Acid
Serum · Lists exfoliating acid, coconut derivatives
sirius groom shampoo
Lists fragrance, coconut derivatives
Biossance
Squalane + Growth Factor and Peptide Firming Moisturizer
Moisturizer · None of Poliage’s flag groups listed
Act+Acre
Stem Cell Thickening Foam™
Hair styling · Lists fragrance, fragrance allergens, essential oils
Kristin Ess
Strengthening Conditioner
Conditioner · Lists fragrance, drying alcohol, silicones, coconut derivatives
Kristin Ess
Strengthening Shampoo
Shampoo · Lists fragrance, silicones, coconut derivatives
Drunk Elephant
T.L.C. Happi Scalp Scrub
Exfoliant · Lists exfoliating acid, salicylic acid, coconut derivatives
The Ordinary
The Ordinary Glycolic Acid 7% Toning Solution (Solução tonificante de ácido glicólico 7%)
Lists exfoliating acid
Tío Nacho
Tío Nacho Anti-Caida Engrosador
Lists fragrance, fragrance allergens, sulfates, parabens
PRAVANA
Treat Masque
Conditioner · Lists fragrance, fragrance allergens, parabens, silicones
Pacifica
Vegan Ceramide Barrier Face Cream
Moisturizer · None of Poliage’s flag groups listed
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