Sodium cocoyl glycinate is a cleansing agent derived from coconut fatty acid and glycine, which is an amino acid.
It is a mild surfactant, meaning it gently removes oil and dirt particles from the skin leaving it feeling clean but still lathered. It's also responsible for a creamy afterfeel of a product.
Science
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Regan, J., Mollica, L. M., & Ananthapadmanabhan, K. P. (2013). A Novel Glycinate-based Body Wash: Clinical Investigation Into Ultra-mildness, Effective Conditioning, and Improved Consumer Benefits. The Journal of clinical and aesthetic dermatology, 6(6), 23–30.