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Ceramides are primarily composed of ceramide phosphocholine and ceramide phosphoethanolamine. Phospholipids are major components of cell membranes, and ceramides make up 40% to 50% of sebum in the stratum corneum. Ceramides are a major component of the intercellular matrix and play a crucial role in maintaining moisture balance in the stratum corneum. Ceramides have a strong ability to bind water molecules, maintaining skin moisture by forming a network structure within the stratum corneum. Therefore, ceramides play a role in retaining skin moisture.

Ceramides are present in all eukaryotic cells and play a crucial role in regulating various life processes, including cell differentiation, proliferation, apoptosis, and aging. Ceramides also play a crucial role in the formation of the epidermal stratum corneum, contributing to skin barrier maintenance, moisturizing, anti-aging, whitening, and disease treatment.