Amino Esters-1 Good Polymer Anti-Ageing Amino Esters-1 at a glance Skin conditioning ingredient Lab synthesized precursor to non-canonical amino acids Not commonly used Amino Esters-1 description Amino esters-1 is a rarely used cosmetics ingredient, used primarily as a skin conditioner. In general, alpha amino esters are considered precursors to what are called non-canonical amino acids, meaning they are not found naturally in the genetic code of living organisms. They are lab synthesized and used to develop small-molecule therapeutics and biologics, most often in pharmaceutical settings. On the rare occasion this ingredient is used in leave-on cosmetics, the typical use level is 2.5%. Related ingredients: Amino Acids