Q. What is the difference between vital and natural amino acids?
Essential amino acids are those that the organism is not capable to synthesize and that need to be ingested by the individual. Natural amino acids are those that are created by the organism.
There are living species that produce every amino acid they require, for example, the bacteria. Escherichia coli that does not have essential amino acids. Other species, like humans, need to acquire necessary amino acids from the diet. Among the twenty different known amino acids that form proteins humans can make twelve of them and the remaining eight needs to be taken from the proteins they swallow with food.
The essential amino acids for humans are phenylalanine, lysine, isoleucine, histidine, methionine, threonine, tryptophane and valine.