Spun yarn is material made by twisting and drawing out fibers, whether natural, such as cotton, wool, and silk, or synthetic, into longer strands. This process aligns the fibers to make them cohesive and stronger, suitable for weaving, knitting, or sewing. The spinning process can be done by hand or using spinning wheels and machines, allowing for a variety of yarn thicknesses and strengths. Spun yarn is fundamental in textile production, offering versatility for fashion, home furnishings, and industrial applications. Its characteristics depend on the type of fiber used, spinning method, and final twist, which influence the texture, durability, and elasticity of the fabric made from the yarn.

Collagen is the most abundant protein in mammals, making up about 25% to 30% of the total protein content. It's primarily found in fibrous tissues such as tendons, ligaments, skin, and muscles. The structure of collagen is unique and complex, consisting of three polypeptide chains that form a triple helix. Each of these chains contains approximately 1,050 amino acids, although this number can vary slightly depending on the specific type of collagen and the organism it originates from. The primary amino acids in collagen are glycine, proline, and hydroxyproline, which are crucial for its stability and functionality. Due to its high content of specific amino acids, collagen has become a popular supplement for improving skin health, joint health, and overall tissue integrity.

Fructose is not an amino acid; rather, it is classified as a simple sugar, also known as a monosaccharide. Amino acids are organic compounds that serve as the building blocks for proteins and play a crucial role in various bodily functions. They contain amino (-NH2) and carboxyl (-COOH) functional groups, along with a side chain specific to each amino acid. In contrast, fructose has a molecular structure that is characteristic of sugars, containing multiple hydroxyl (-OH) groups and a carbonyl group (-C=O) but not the functional groups specific to amino acids. Fructose is mainly found in fruits and honey and is used by the body as a source of energy, especially in the liver where it is metabolized. The confusion between fructose and amino acids may arise from the fact that both are fundamental components of biological systems but their functions and structures are quite distinct.