Amino Acid |
Health Benefits |
Claims |
Notes |
Nonessential (synthesized
in the body) |
Alanine |
Inhibitory
neurotransmitter in the brain; component of cell
walls; glucose can be made from alanine in the liver
or from muscles when energy is needed; part of some
intestinal bacteria |
Increases excitation
(i.e., in epilepsy); maintains blood sugar level;
helpful in treating hypoglycemia; helps those with
suppressed immune systems |
No scientific
evidence supporting these claims |
Serine
|
Component of
nerve coverings and brain proteins; involved in
metabolism of purines and pyrimidines (part of RNA
and DNA); important information of cell membranes
and creatine synthesis |
|
|
Proline |
Major amino
acid in collagen; involved in formation of bone,
skin, and cartilage |
Aids in tissue
repair after injury, wound healing, and maintaining
joints and tendons |
|
Asparagine
|
Formed from
aspartic acid; helps in the metabolic function of
brain and nervous system cells |
|
|
L-arginine
|
Effects on
several major endocrine hormones; plays a large
role in muscle growth and healing; helps regulate
and support key components of the immune system;
important in male fertility (is essential in children) |
Boosts immunity;
fights cancer; builds muscle and burns fat; promotes
healing of burns and wounds; protects liver and
detoxifies harmful substances; enhances male fertility |
Effects on
several major endocrine hormones; plays large role
in muscle growth and healing; helps regulate and
support key components of the immune system; important
in male fertility (is essential in children) |
L-ornithine |
Shares arginine's
properties; is also capable of stimulating growth
hormone release |
Can increase
the weight and activity of the thymus gland, possibly
enhancing the immune system response; shown to have
liver-regenerating effects in animals |
|
L-aspartic
Acid |
Involved in
formation of ammonia and urea for disposal; excitatory
function in the brain |
Treatment of
chronic fatigue, "aerobic enhancers" to boost energy;
may be helpful in overcoming opiate withdrawal |
Suggestions
that it works in this way are preliminary; used
clinically to treat fatigue and depression |
L-cysteine |
Precursor of
glutathione, a major antioxidant in the body |
Said to inactivate
free radicals and therefore protect and preserve
cells; extends lifespan via DNA repair; burns fat;
builds muscle; protects against various toxic substances;
combats arthritis |
More work needs
to be done re: extending lifespan; need more research
on protection from toxins and pollutants; preliminary
study on arthritis claim but needs more study |
L-glutamine
and L-glutamic Acid |
Glutamine is
a derivative of glutamic acid; important in brain
function; precursor of important neurotransmitters
in nervous system |
Glutamine may
help curb alcohol craving, speed healing of peptic
ulcers, energize the mind, inhibit senility, counter
depression; glutamic acid is claimed to boost IQs
of mentally retarded people |
Studies have
consistently contradicted one another; recent animal
work on alcohol claim and its possible favorable
effects, more work is needed; used in alcoholism
clinics as it decreases the craving for alcohol,
may do so for sugar as well, not proven yet though |
Glycine |
Helps save
glucose for energy by facilitating glycogen storage;
involved in brain metabolism; necessary for synthesis
of hemoglobin and collagen |
May help dampen
overactive brain processes that produce certain
forms of spastic movement; helps heal wounds; reduces
gastric acidity |
More work is
needed |
L-histidine |
Essential in
children for growth; involved in production of blood
cells and histamine |
May be helpful
in treating arthritis, rheumatoid arthritis |
More work is
needed |
L-tyrosine
|
Synthesized
from phenylalanine; involved with important brain
neurotransmitters; can cause large short-term increase
in levels of dopamine, epinephrine and norepinephrine
in the blood |
Psychic energizer
and stress reliever; antidepressant; effective in
treating PMS; addictive drug detoxifier; diminishes
pain; improves memory; increases sexual interest;
appetite suppressor; treats Parkinson's disease |
Studies suggest
that it may be an energizer and antidepressant;
anecdotal evidence and accumulating clinical data
for PMS relief; favorable reports on detoxifying
addictive drugs |
Amino Acid |
Health Benefits |
Claims |
Notes |
Essential (not
synthesized in the body) |
Threonine |
Important constituent
in many proteins; essential in formation of elastin,
collagen, and tooth enamel protein; minor role in
controlling fat buildup in the liver |
Helps some
cases of depression |
No evidence
that it treats depression |
L-leucine,
L-isoleucine, L-valine |
|
Promoted as
potent anabolics (muscle builders) and energizers;
help restore muscle mass in those who have liver
disease or who have had trauma; useful in treating
liver damage; helpful in some neurologic disorders
and Lou Gehrig's disease |
Little scientific
evidence to support claims of muscle building and
energy enhancing; appears useful for effects of
chronic liver disease |
L-lysine
|
Promotes tissue
repair and growth; involved in production of hormones,
enzymes and antibodies |
Inhibits herpes;
builds muscle |
Studies have
reported positive and negative findings; only anecdotal
evidence on building muscle |
L-methionine
and Taurine |
Taurine and
cysteine, important amino acids, depend on methionine
for biosynthesis in the body; helps regulate nervous
system and muscle system |
Help eliminate
fatty substances that might otherwise clog the arteries;
may be essential for growth of adolescents, children
and infants |
Shown to have
a depressant effect on the central nervous system
and may impair short-term memory; otherwise, little
research has been done |
L-phenylalanine,
D-phenylalanine, DL-phenylalanine |
Involved in
a number of biochemical processes related to brain
synthesis of various neurotransmitters |
Claimed to
increase mental alertness; help control addictive
substance abuse; promote sexual arousal and releases
hormones to control appetite; alleviate chronic
pain; treats Parkinson's disease |
DL- no scientific
support for pain relief, analgesic, and anti-inflammatory
effects shown; some anecdotal, experimental evidence
that L-increases alertness; no evidence on appetite
suppression or sex stimulation; preliminary evidence
re: addictive behavior |
L-tryptophan
|
Important in
the biosynthesis of serotonin, a brain neurotransmitter
thought to be an inducer and regulator of certain
stages of sleep |
Natural sleeping
aid; mood regulator; may reduce sensitivity to pain
and have tranquilizing effects; appetite suppressor
and reduces cravings for alcohol and some other
drugs; helps prevent panic attacks |
Appears to
work well for sleeping and jet lag; in preliminary
studies, acts as a mood regulator and prevents panic
attacks; some studies say does relieve pain; results
in humans re: appetite suppression mixed; alcohol
craving suppression not directly investigated |