Why Does Retin-A Cream Contain Isopropyl Myristate? Isn't that considered highly comedogenic?

  Isopropyl myristate is an ingredient found in a number of cosmetic formulations. It serves as a thickening agent and an emollient.    Back in 1986 there was a study published in the Archives of Dermatology which demonstrated  that isopropyl myristate had the propensity to clog pores in the rabbit ear assay ( hope that did not rile up the Norfolk-based PETA people).  Around that time, if memory serves me right, Dr. Fulton came out with his list of... more

This is essentially a common ingredient in many cosmeceuticals and funcitons as a skin conditioning agent that is added to lubricate the skin and act as a moisturizing agent or emolient. I  assume that you, as well as I, were somewhat surprised to see the Wikipedia entry that describes it as a an additive to kill head lice.