What are the primary components of hair?

The primary components of hair include keratin, moisture, and lipids. Keratin is a fibrous protein that makes up the structure of hair, providing strength and resilience. This protein is essential for the hair's overall integrity and is what gives hair its characteristic toughness. Moisture is also a crucial component as it helps maintain the flexibility and elasticity of hair strands. Without adequate moisture, hair can become dry, brittle, and prone to breakage. Lipids, which include natural oils produced by the scalp, play a vital role in keeping the hair moisturized, protecting it from environmental damage, and imparting shine. Together, these components collaborate to determine the health and appearance of the hair.

The other options include components that may be found in the body or in other contexts but do not accurately represent the primary constituents of hair itself. For example, while collagen is important for skin structure, it is not a primary component of hair. Similarly, vitamins and minerals play essential roles in overall health but do not make up the actual structure of the hair fibers.