Summary:
- The article evaluates the dermatological necessity of specialized "nighttime" facial oils, distinguishing between marketing claims and physiological skin repair processes.
- It explains the science of the skin barrier, explaining that while occlusion can prevent transepidermal water loss (TEWL), the specific timing of product application is less critical than the efficacy of the active ingredients themselves.
- The author concludes that while oils can be beneficial for barrier support, consumers should prioritize ingredient quality and skin type compatibility over the "nighttime" label, which is largely a marketing construct.