Abstract
A decrease in the ceramide content of the stratum corneum is known to cause dry and barrier‐disrupted skin. In this literature review, the clinical usefulness of preparations containing natural or synthetic ceramides for water retention and barrier functions was evaluated. The PubMed, Cochrane Library, and Igaku Chuo Zasshi databases were searched using keywords such as “ceramide”, “skincare products”, “barrier + hydration + moisture + skin”, and “randomized trial”. All database searches were conducted in February 2019. Forty‐one reports were selected based on the following criterion: comparative control studies that evaluated the effects of ceramide‐containing formulations based on statistical evidence. Among the 41 reports, 12 were selected using the patient, intervention, comparison, and outcome approach. These 12 reports showed that external ceramide‐containing preparations can improve dry skin and barrier function in patients with atopic dermatitis. However, a double‐blinded comparative study with a large sample size is warranted for appropriate clinical use.
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