INCI · other · CIR review pending · used in 8 products
Threonine
Threonine is an essential amino acid that serves as a key building block of collagen and elastin. It is classified as a skin-identical ingredient, meaning it is naturally found in the skin. When taken orally, it supports digestive and intestinal tract function and aids nutrient absorption, though its specific role in topical skincare is less well-defined.
Evidence level
weakEWG score
—Comedogenic
—Category
other● Benefits
Threonine is primarily noted as a skin hydrator in topical formulations. As a building block of collagen and elastin, it may support structural skin proteins, though the source indicates its topical benefits beyond hydration are not clearly established.
hydratingbarrier-support
● Cautions
