Dimethiconol cysteine is a chemical compound, end-capped homopolymer, with polymer chains of dimethylsiloxyl monomers in reaction with cysteine.
Dimethiconol is a synthetic polymer, a kind of silicone rubber similar to dimethicone, and is considered safe from a safety viewpoint by the FDA (Food and Drug Administration).

What it is used for and where it is used
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.
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