Threonine
Threonine is a hair conditioning and hair waving or straightening ingredient. It’s in 92 products on Poliage, most often conditioner, serum and moisturizer. Avoid lists on Poliage that include it: none.
Updated October 22, 2026
In plain English
Threonine: used to make hair smoother and easier to comb. Also used in hair-waving and straightening products.
What it does
Contains Threonine: antistatic
Function listed in CosIng
Contains Threonine: hair-conditioning
Function listed in CosIng
Contains Threonine: hair-waving-or-straightening
Function listed in CosIng
Source: CosIng, the European Commission cosmetic ingredient database, ref 38594, accessed October 22, 2026.
Products that contain Threonine
Moroccanoil
Leave-in Conditioner
Conditioner · Lists fragrance, fragrance allergens, drying alcohol, silicones
Thrive Causemetics
Liquid Brilliance Super Serum
Serum · None of Poliage’s flag groups listed
Anastasia Beverly Hills
Luminous Foundation
Foundation · Lists silicones
The Ordinary
Marine Hyaluronics
Serum · Lists exfoliating acid, salicylic acid
Drunk Elephant
Mello Marula Cream Cleanser with 1.0% Colloidal Oatmeal
Cleanser · Lists coconut derivatives
Olaplex
MOISTURIZE AND MEND LEAVE-IN CONDITIONER FULL SIZE
Conditioner · Lists fragrance, fragrance allergens, exfoliating acid, essential oils, coconut derivatives
Olaplex
MOISTURIZE AND MEND LEAVE-IN CONDITIONER TRAVEL SIZE
Conditioner · Lists fragrance, fragrance allergens, exfoliating acid, essential oils, coconut derivatives
Moroccan oil body lotion
Lists fragrance
Dermalogica
Multi Active Toner
Toner · Lists fragrance allergens, essential oils, silicones
The Ordinary
Multi-Peptide + Copper Peptides 1% Serum
Serum · None of Poliage’s flag groups listed
The Ordinary
Multi-Peptide + HA Serum
Serum · None of Poliage’s flag groups listed
The Ordinary
Natural Moisturizing Factors + Beta Glucan
Moisturizer · 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
SHEGLAM
On The Glow 1-Minute Revive Rich Hair Cream
Hair styling · Lists fragrance, fragrance allergens, drying alcohol, silicones, coconut derivatives
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
Andalou Naturals
Resurfacing Texture Refining Night Cream
Moisturizer · Lists fragrance, fragrance allergens, exfoliating acid, essential oils
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