Proteins Are Built, Not Born – And Amino Acids Are the Architects Amino acids are the real builders behind every protein in your body. Muscles, enzymes, hormones, antibodies, even neurotransmitters exist because amino acids link together in precise sequences. They are divided into two powerful groups. Essential amino acids must come from food because your body cannot make them. Non-essential amino acids are synthesized inside your body as needed. Together, they control growth, immunity, metaboli