Biomimetic Marine-Derived Human-like Ceramides as a Natural Alternative to Synthetic Ceramides for Skin Barrier Restoration

Skin barrier function relies on the integrity of the stratum corneum lipid matrix, composed of ceramides, cholesterol, and free fatty acids (FFA). Disruption of this system, due to aging or environmental stressors, leads to increased trans epidermal water loss (TEWL), reduced skin moisture, and impaired skin barrier function. Despite its widespread use, synthetic ceramide NP does not fully replicate the diversity of native epidermal lipids. This study aimed to evaluate the efficacy of Oceamides® (hereafter OCM or the active ingredient), an ingredient based on a marine- derived natural biomimetic lipid complex obtained from the microalga Nannochloropsis gaditana, containing human-like ceramides (NP, NS, NG), FFA and cholesterol, combined with phosphatidylcholine (PC) and cyclodextrin (CD). Its efficacy was assessed through one in vitro study using a reconstructed human epidermis model and three clinical studies. OCM resulted in a significant improvement in skin barrier integrity (+37% at 48 h), enhanced protection (+12% at 6 h), and promoted regeneration (+18% at 6 h) in the in vitro study. In clinical studies, OCM (0.5%) reduced TEWL after 3 days of topical application (−15% forehead, −9% chin, −24% cheeks), increased skin moisture more rapidly than synthetic ceramide NP (+13% vs. +9% at 2 h), and improved skin firmness (+14% vs. +9.2%), with comparable reductions in skin fatigue (-22%). These findings suggest that OCM is an effective natural and biomimetic alternative to synthetic ceramide NP, providing faster and multi- parametric effects of skin barrier function through a multi-component lipid approach composition.