How to understand, synthesized in the human body?

Synthesis is the process of forming more complex substances from simpler ones. To be synthesized in the human body means to be formed in the human body from simpler substances. An example of synthesis is the formation of proteins from their monomers – amino acids. With food, we get animal and plant proteins, which are broken down into amino acids, and then the human body’s own proteins are synthesized from these amino acids.