👉 Nails fluid, also known as subungual epithelial fluid, is a clear or slightly yellowish liquid that naturally occurs beneath the nail plate and within the nail bed. It serves as a protective barrier, helping to maintain the health and integrity of the nail by preventing damage from external factors such as trauma, chemicals, or infections. This fluid is produced by the subungual epithelial cells and contains essential nutrients like proteins, amino acids, and minerals that contribute to nail strength and resilience. When the fluid's production is disrupted, it can lead to various nail conditions, including discoloration, thickening, or separation from the nail bed.