Researched by Helena DeMaria-Williams
Formula IngredientAmino AcidThreonine
INCI: Threonine
Threonine is an essential amino acid that cannot be synthesised by the human body and must be obtained through diet or topical application. It is a key building block of collagen and elastin, the structural proteins responsible for skin firmness and elasticity. In cosmetic formulations it functions primarily as a skin-conditioning and hair-conditioning agent, providing hydration and helping to maintain the skin's natural moisture barrier.
Category
Amino Acid
Irritation Risk
Low
Skin Types
all skin types, dry, sensitive, ageing, acne-prone
What does this do in a formula?
hydration, skin conditioning, supports collagen and elastin structure, hair conditioning, skin barrier support
Is Threonine safe? Key considerations
Can Threonine cause irritation?
Low RiskThe CIR Expert Panel reviewed amino acids including threonine and concluded they are not dermal irritants or sensitizers at concentrations used in cosmetic products. No EU CosIng Annex II or III restrictions apply. INCIBeauty assigns no safety penalty in any category.
Does Threonine increase sun sensitivity?
No RiskThreonine does not increase photosensitivity. No special sun protection measures are required when using threonine-containing products.
Is Threonine safe during pregnancy?
SafeThreonine is a naturally occurring essential amino acid present in the body. The CIR Expert Panel determined that concentrations used in cosmetic products are lower than levels that would result in significant exposure. No reproductive or developmental concerns have been identified.
How does Threonine work?
Threonine is an essential amino acid that cannot be synthesised by the human body and must be obtained through diet or topical application. It is a key building block of collagen and elastin, the structural proteins responsible for skin firmness and elasticity. In cosmetic formulations it functions primarily as a skin-conditioning and hair-conditioning agent, providing hydration and helping to maintain the skin's natural moisture barrier.
Which products contain Threonine?
Shop products that contain Threonine
Collagen Peptide Serum
Glycolic Acid 7% Exfoliating Toner
Multi-Peptide + Copper Peptides 1% Serum
Squalane + Amino Acids Lip Balm
Natural Moisturizing Factors + HA
Natural Moisturizing Factors + PhytoCeramides
Multi-Peptide + HA Serum
Natural Moisturizing Factors + Beta Glucan
Natural Moisturizing Factors + Inulin Body Lotion
Marine Hyaluronics
Amino Acids + B5
