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