In a recent article published in the American Journal of Clinical Dermatology, the authors reviewed and summarized evidence on utility of natural plant-based oils in dermatology, particularly in repairing the natural skin barrier function. They highlighted the importance of unique characteristics of various oils when considering their use for topical skincare. Different ratios of essential fatty acids are major determinants of the barrier repair benefits of natural oils. Oils with a higher linoleic acid to oleic acid ratio have better barrier repair potential, whereas oils with higher amounts of irritating oleic acid may be detrimental to skin barrier function. Additionally, various extraction methods exist which is an important component of selecting oil for skin care. Cold pressing is described as the preferred method of oil extraction as the heat and chemical free process preserves beneficial lipids and limits irritating byproducts.
Alexandra R; Vaughn, Ashley K. Clark and Raja K. Sivamani.Natural Oils for Skin-Barrier Repair: Ancient Compounds Now Backed by Modern Science Am J Clin Dermatol (2018) 19:103-117