Amino acids are the building blocks of proteins, one of our basic nutrients found throughout the human body. The human body can produce some amino acids itself (non-essential amino acids), while others must be ingested through food (essential amino acids). Of all the different amino acids, only 20 are involved in the construction of proteins. Amino acids are vital for all body functions, such as digestion, liver function and wound healing. Amino acids supply the skin, ligaments, tendons, muscles, glands, internal organs, hair and nails. They contribute to hormone production and the neurotransmission of substances and enzymes. They also serve as a source of energy and as a building block that produces carbohydrates and lipids. The most abundant source of basic amino acids are foods of anima.