Which nutrient helps to build glycosaminoglycans (GAGs) in the body?

Glucosamine is the correct answer because it plays a critical role in the synthesis of glycosaminoglycans (GAGs), which are essential components of connective tissues including skin, cartilage, and joint fluid. GAGs contribute to the structural integrity, hydration, and elasticity of these tissues. Glucosamine, as an amino sugar derived from glucose, is specifically needed for the formation of GAGs, supporting the production of hyaluronic acid, chondroitin sulfate, and other vital molecules that maintain connective tissue health.

While other nutrients, such as amino acids and certain vitamins, play significant roles in various bodily functions, they do not specifically contribute to the production of GAGs in the same direct manner as glucosamine. Amino acids are vital for protein synthesis, while vitamins support a variety of metabolic processes, and lecithin acts as an emulsifier rather than being directly involved in GAG synthesis.