Which elements primarily make up human hair along with carbon, oxygen, and hydrogen?

Human hair is primarily composed of proteins, with keratin being the most significant type. The building blocks of these proteins include various elements, among which nitrogen and sulfur play crucial roles.

Nitrogen is a key component of amino acids, which are the building blocks of proteins. Specifically, it is found in the amino acid cysteine, which contains sulfur and contributes to the structural integrity and resilience of hair. Meanwhile, sulfur forms disulfide bonds, which provide strength and elasticity to the hair structure.

While other elements can be found in trace amounts within the body, the focus on nitrogen and sulfur is critical in understanding the biochemical composition of hair and its physical properties. This knowledge is essential for professionals in cosmetology, as it influences hair care treatments and product formulation.