What it is
Theanine is a non-protein amino acid most associated with the leaves of the tea plant, Camellia sinensis. In topical formulations it is used as a skin-conditioning agent that can help support hydration and a smooth skin feel. It is often included in formulas that highlight tea-derived or amino-acid-based actives.
Safety & warnings
Theanine is an amino acid generally regarded as gentle and well tolerated on skin at cosmetic levels, with low irritation potential. It is not a recognized fragrance allergen and is not associated with comedogenicity.
Origin & sourcing
Naturally present in tea leaves and some fungi; cosmetic-grade material is commonly produced by extraction from tea or by fermentation and biosynthesis.
Questions everyone asks
Where does theanine come from?
It is an amino acid found primarily in tea leaves and is also produced through fermentation for cosmetic use.
What does theanine do for the skin?
It serves as a skin-conditioning ingredient that can help support hydration and a smooth, comfortable feel.