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
Andalou Naturals
Resurfacing Triple Acid Exfoliating Toner
Toner · Lists fragrance, fragrance allergens, exfoliating acid, essential oils, coconut derivatives
The Ordinary
Rice Lipids + Ectoin Microemulsion
Moisturizer · None of Poliage’s flag groups listed
sirius groom shampoo
Lists fragrance, coconut derivatives
Clover
Smoothing Deep Conditioner
Lists fragrance, fragrance allergens
The Ordinary
Squalane + Amino Acids Lip Balm
Lip · Lists exfoliating acid
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
Naturium
The Multi-Vitamin Daily Nutrients Body Wash
Body wash · Lists essential oils, 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
Kenra Professional
Truly Thickening Conditioner
Conditioner · Lists fragrance, fragrance allergens, essential oils, silicones
Kenra Professional
Truly Thickening Shampoo
Shampoo · Lists fragrance, fragrance allergens, exfoliating acid, essential oils, silicones, coconut derivatives
Eucerin
Urea Repair
Lists exfoliating acid
Eucerin
UreaRepair PLUS 10%
Lists exfoliating acid
Pacifica
Vegan Ceramide Barrier Face Cream
Moisturizer · None of Poliage’s flag groups listed
Pacifica
Vegan Ceramide Extra Gentle Face Wash
Cleanser · Lists coconut derivatives
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