Amino acid benefits are simple to name because, without amino acids, we cannot
exist. Every anatomical and physiological feature of a living organism is made
possible through the existence of amino acids.
The nine essential amino acids are histidine, isoleucine, leucine, lysine, methionine,
phenylalanine, threonine, tryptophan, and valine.

Isoleucine is one of three branched-chain amino acids (BCAAs). It helps to increase
the rate of protein synthesis and promotes muscle tissue formation.
Histidine is a precursor to various hormones and metabolites important
to kidney function, gastric secretion, the immune system, and neurotransmission. It
helps to produce red blood cells and hemoglobin.
Lysine has an important part to play in cell division and growth as it is a major
building block of growth factors.
Methionine contains the element sulfur which is essential
to cartilage and liver health and ameliorates hair structure and nail strength. 
Phenylalanine is a precursor of tyrosine hydroxylase, an enzyme that speeds up
catecholamine synthesis and so affects mood.
Threonine increases the uptake of other amino acids such as phenylalanine but also
contributes to neurotransmitter balance in the brain, muscle tissue production, and
immune system function.
Tryptophan is a precursor molecule of niacin (vitamin B3), melatonin and serotonin
and thus essential for sleep and mood.

 Folic acid deficiency
 Chills,
 Fever,
 Flushing (sense of warmth in the face, ears, neck and trunk)

 Increased sweating
 Metabolic disorder
 Vomiting
 Liver damage

Essential amino acids cannot be made by the body. As a result, they must come from
food.
Take extra caution in patients with the following medical conditions:
Severe acidosis
Congestive heart failure