Hydrolyzed Oat Protein is a chemical compound, derived from oat (Gramineae family). Oat have been used for generations as a traditional medicine for the symptomatic treatment of minor skin inflammations (such as sunburn) and as an aid in healing minor wounds. This cosmetic ingredient can be derived from any species of oats. Oats are rich in flavonoids including kaempferol, amino acids including lysine and threonine, lipids including unsaturated triglycerides and phenolic compounds including benzoic and cinnamic acids, phenolic esters with antioxidant activity.
Compendium of the most significant studies with reference to properties, intake, effects: https://www.tiiips.com/m/tiiips/home?action=listReviews&reviewID=10040&oID=24047

What it is used for and where
Cosmetics
Hair conditioning agent. A large number of ingredients with specific purposes can co-exist in a hair shampoo: cleansers, conditioners, thickeners, mattifying agents, sequestering agents, fragrances, preservatives, special additives. However, the indispensable ingredients are the cleansers and conditioners as they are necessary and sufficient for hair cleansing and manageability. The others act as commercial and non-essential auxiliaries such as: appearance, fragrance, colouring, etc. Hair conditioning agents have the task of increasing shine, manageability and volume, and reducing static electricity, especially after treatments such as colouring, ironing, waving, drying and brushing. They are, in practice, dispersing agents that may contain cationic surfactants, thickeners, emollients, polymers. The typology of hair conditioners includes: intensive conditioners, instant conditioners, thickening conditioners, drying conditioners.

Skin conditioning agent - Miscellaneous. This ingredient has the task of modifying the condition of the skin when it is damaged or dry by reducing its flakiness and restoring its elasticity.
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