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2. Essential amino acid - Wikipedia

   en.wikipedia.org/wiki/Essential_amino_acid

   An essential amino acid, or indispensable amino acid, is an amino acid that cannot be synthesized from scratch by the organism fast enough to supply its demand, and must therefore come from the diet. Of the 21 amino acids common to all life forms, the nine amino acids humans cannot synthesize are valine, isoleucine, leucine, methionine ...

3. Amino acid - Wikipedia

   en.wikipedia.org/wiki/Amino_acid

   Of the 20 standard amino acids, nine (His, Ile, Leu, Lys, Met, Phe, Thr, Trp and Val) are called essential amino acids because the human body cannot synthesize them from other compounds at the level needed for normal growth, so they must be obtained from food. [87] [88] [89]

4. Complete protein - Wikipedia

   en.wikipedia.org/wiki/Complete_protein

   Complete protein. A complete protein or whole protein is a food source of protein that contains an adequate proportion of each of the nine essential amino acids necessary in the human diet. [1][2][3][4][5]

5. Phenylalanine: Role of Amino Acid and Purpose in Diet

   www.aol.com/phenylalanine-role-amino-acid...

   It's an essential amino acid, meaning you must get it from your diet because the human body can't produce it. ... Phenylalanine is one of 20 amino acids: nine essential and 11 nonessential. Your ...

6. Protein (nutrient) - Wikipedia

   en.wikipedia.org/wiki/Protein_(nutrient)

   There are nine essential amino acids which humans must obtain from their diet in order to prevent protein-energy malnutrition and resulting death. They are phenylalanine, valine, threonine, tryptophan, methionine, leucine, isoleucine, lysine, and histidine. [2] [4] There has been debate as to whether there are 8 or 9 essential amino acids. [5]

7. Lysine - Wikipedia

   en.wikipedia.org/wiki/Lysine

   Lysine is an essential amino acid in humans. [50] The human daily nutritional requirement varies from ~60 mg/kg in infancy to ~30 mg/kg in adults. [36] This requirement is commonly met in a western society with the intake of lysine from meat and vegetable sources well in excess of the recommended requirement. [36]