Essential and non-essential amino acids, protein quality

These six are arginine, cysteine, glycine, glutamine, proline, and tyrosine. Six amino acids are non-essential (dispensable) in humans, meaning they can be synthesized in sufficient quantities in the body. ... The limiting amino acid is the essential amino acid found in the smallest quantity in the foodstuff.

For better understanding, the student must watch the following youtube videos

https://youtu.be/Sb59aH4gknY