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Amino Acid Guide
There are three types of amino acids; the indispensable amino acids, the conditionally dispensable amino acids, and the dispensable amino acids. Indispensable amino acids, also called essential amino acids, must be supplied to the body from food or supplements. Conditionally dispensable amino acids are based on the body's ability to actually synthesize them from other amino acids. Dispensable amino acids, also called nonessential amino acids, can be synthesized by the body from other amino acids. Here is the amino acid guide and their benefits.

The Indispensable Amino acids

Isoleucine

A branched chain amino acid readily taken up and used for energy by muscle tissue.
Used to prevent muscle wasting in debilitated individuals
Essential in the formation of hemoglobin


Leucine

A branched chain amino acid used as a source of energy
Helps reduce muscle protein breakdown
Modulates uptake of neurotransmitter precursors by the brain as well as the release of enkephalins, which inhibit the passage of pain signals into the nervous system.
Promotes healing of skin and broken bones.


Valine

A branched chain amino acid
Not processed by the liver; rather actively taken up by muscle
Influences brain uptake of other neurotransmitter precursors (trptophan, phenylalanine and tryosine).


Histadine

One of the major ultraviolet absorbing compounds in the skin
Important in the production of red and white blood cells; used in the treatment of anemia
Used in the treatment of allergic diseases, rheumatoid arthritis and digestive ulcers.


Lysine

Low levels can slow protein synthesis, affecting muscle and connective tissue
Inhibits viruses; used in the treatment of herpes simplex
Lysine and Vitamin C together form L-carnitine, a biochemical that enables muscle tissue to use oxygen more efficiently, delaying fatigue
Aids bone growth by helping form collagen, the fibrous protein that makes up bone, cartilage and other connective tissue.


Methionine

Precursor of cystine and creatine
May increase antioxidant levels (glutathione) and reduce blood cholesterol levels.
Helps remove toxic wastes from the liver and assists in the regeneration of liver and kidney tissue


Phenylalanine

The major precursor of tyrosine
Enhances learning, memory, mood and alertness
Used in the treatment of some types of depression
Is a major element in the production of collagen
Suppresses appetite


Threonine

One of the amino detoxifers
Helps prevent fatty buildup in the liver
Important component of collagen
Generally low in vegetarians


Tryptophan

Precursor of key neurotransmitter serotonin, which exerts a calming effect
Stimulates the release of growth hormones
Free form of this amino acid is unavailable in the U.S.
It is only available in natural food sources

Conditionally Dispensable Amino Acids

Arginine

Can increase secretion of insulin, glucagon, growth hormones
Aids in injury rehabilitation, formation of collagen and immune system stimulation.
Precursor of creatine, gamma amino butric acid (GABA, a neurotransmitter in the brain)
May increase sperm count and T-lymphocyte response


Cysteine

Detoxifies harmful chemicals in combination with L-aspartic acid and L-citruline
Helps prevent damage from alcohol and tobacco use
Stimulates white blood cell activity


Tyrosine

Precursor of the neurotransmitters dopamine, norepinephrine and epinephrine, as well as thyroid and growth hormones and melanin (the pigment responsible for skin and hair color).
Elevates mood


Dispensable Amino Acids

Alanine

Major component of connective tissue
Key intermediate in the glucose alanine cycle, which allows muscles and other tissues to derive energy from amino acids
Helps build up the immune system


Aspartic Acid

Helps convert carbohydrates into muscle energy
Builds immune system immunoglobulins and antibodies
Reduces ammonia levels after exercises


Cystine

Contributes to strong connective4e tissue and tissue antioxidant actions
Aids in healing processes, stimulates white blood cell activity and helps diminish pain from inflammation
Essential for the formation of skin and hair


Glutamic Acid

A major precursor of glutamine, proline, ornothine, arginine, glutathione, and GABA
A potential source of energy
Important in brain metabolism and metabolism of other amino acids.


Glutamine

Most abundant amino acid
Plays a key role in immune system functions
An important source of energy, especially for kidneys and intestines during caloric restrictions.
A brain fuel that is an aid to memory and a stimulant to intelligence and concentration


Glycine

Aids in the manufacture of other amino acids and is a part of the structure of hemoglobin and cytochromes (enzymes involved in energy production)
Has a calming effect and is sometimes used to treat manic depressive and aggressive individuals
Produces glucagon, which mobilizes glycogen
Can inhibit sugar cravings


Ornithine

May help increase growth hormone secretion in high doses
Aids in immune and liver function
Promotes healing


Proline

A major component in the formation of connective tissue and heart muscle
Readily mobilized for muscular energy
Major constituent of collagen


Serine

Important in cells' energy production
Aids memory and nervous system function
Helps builds up immune system by producing immuno-globulins and antibodies


Taurine

Aids in the absorption and elimination of fats
May act as a neurotransmitter in some areas of the brain and retina...

SOURCE: In-Human