Arginine causes the
Body to Release Vital Hormones, Increases Lean Muscle Mass and Burns Fat,
Lowers Cholesterol, Boosts the Immune System, Speeds
up Recovery from Surgery and Injury
Arginine is a vitally important amino acid that has
been studied for more than fifty years. Amino acids
are the building blocks of protein, and protein is
the building block of all living cells. The greatest
portion of human body weight, after water, is
protein. On the cellular level, the principal
function of DNA is to provide the "blueprints" for
production of hundreds of different proteins, each
constructed from unique sequences of amino acids
that are held together by peptide bonds. There are
more than twenty commonly known amino acids, and
additional amino acids are periodically identified,
classified, and studied.
A
healthy liver can produce approximately 80 percent
of the body's required amino acids. They are termed
the "nonessential" amino acids, not because they
lack importance, quite the contrary, but because the
body can synthesize them from other amino acids
obtained from dietary sources. The human body, for
example, can readily synthesize arginine to
ornithine, or ornithine to arginine. The remaining
20 percent of amino acids required by humans are
termed "essential" amino acids because they cannot
be manufactured by the body and must be obtained
from dietary sources. The body's ability to
synthesize the nonessential amino acids such as
arginine, and to utilize all amino acids, can be
adversely affected by an individual's advancing age,
overall health, organ health, the presence of
infection, physical trauma such as injury, effects
of stress, compromised nutrient absorption capacity,
and imbalances of other nutrients.
The study of amino acids is making a major
contribution to the understanding of diseases. Amino
acid therapies have been used successfully to
prevent aging, prevent heart disease, enhance
memory, eliminate depression, control stress,
improve sleep, relieve arthritis, reduce herpes,
arrest alcoholism, manage allergies, and promote
hair growth. [1]
Arginine has been linked to enhanced immunity, the
release of the Human Growth Hormone (HGH), greater
muscle mass, rapid healing from injury, increased
sexual potency, and helping to reverse
atherosclerosis. [2]
Sometimes one amino acid can cancel the effect of
another. For example, arginine is reported to have
an antagonistic relationship with lysine. [1] On the
other hand, arginine has a complementary
relationship with ornithine, citrulline, and
aspartic acid.
Requirements
R.D.A. Minimal Requirements. The U.S. Government,
through the National Research Council's Food and
Nutrition Board, has not established a Recommended
Dietary Allowance (RDA) for Arginine.
Unique Needs. Each person has biochemical
individuality, and significantly differing needs for
amino acid supplements. Amino acid levels are
effected by diet, gender, geography, and
fluctuations according to the time of day. When
supplementing arginine orally, some researchers
recommend taking the supplements for two months,
then discontinuing for two months before starting a
new "cycle." [3, 4]
Signs of Deficiency. Deficiency produces symptoms of
muscle weakness, similar to muscular dystrophy. [1]
Arginine-deficiency impairs insulin production,
glucose production, and liver lipid metabolism. [3]
Conditional deficiencies of arginine or ornithine
are associated with the presence of excessive
ammonia in the blood, excessive lysine, rapid
growth, pregnancy, trauma, or protein deficiency and
malnutrition. Arginine deficiency is also associated
with rash, hair loss and hair breakage, poor wound
healing, constipation, fatty liver, hepatic
cirrhosis, and hepatic coma. [1]
Food Sources. Dietary arginine is found in
chocolate, wheat germ and flour, buckwheat, granola,
oatmeal, dairy products (cottage cheese, ricotta,
nonfat dry milk, skim yogurt), beef (roasts,
steaks), pork (Canadian bacon, ham), nuts (coconut,
pecans, cashews, walnuts, almonds, Brazil nuts,
hazel nuts, peanuts), seeds (pumpkin, sesame,
sunflower), poultry (chicken and turkey light meat),
wild game (pheasant, quail), seafood (halibut,
lobster, salmon, shrimp, snails, tuna in water),
chick peas, and cooked soybeans. [2, 11]
Substantially increasing consumption of dietary
protein (meats, dairy products, etc.) to ensure
optimal levels of circulating amino acids may prove
to be unhealthy because excessive dietary protein
places stress on the liver and kidneys, which
process the waste products of protein metabolism.
[2] In addition, protein-rich foods often are rich
in fats, which may cause unwanted weight gain and an
unfavorable cholesterol profile.
Forms. Arginine, like most amino acids, can have one
of two forms, called the L-form and the D-form.
These two forms are mirror images of each other,
with the L-form molecule rotating in a spiral to the
left (L for "levo" which is Latin for "left") and
the D-form spiralling to the right (D for "dextro,"
Latin for "right"). The L-form of arginine (and most
other amino acids) is more compatible with human
biochemistry, such that L-arginine is the only form
recommended. [3]
Most researchers recommend the free (also called
undigested) forms of amino acids, which do not need
to be digested and are absorbed directly into the
blood for distribution throughout the body. In
hospital settings, arginine may be prescribed for
therapeutic purposes in the forms of di-peptides,
tri-peptides, or hydrolysates, but generally the
free form is considered best, particularly the
L-form. [1]
Some nutrition scientists advise that
supplementation of L-arginine and lysine may have
mutually negating effects such that the benefits of
neither are full expressed. Other experts, however,
recommend "stacking" (taking more than individual
amino acid supplements at the same time) to boost
their effects, such as arginine and lysine
supplements taken together to amplify the effects of
both, for example: reportedly increasing HGH release
by four times that of arginine alone. [8] Another
researcher suggests supplementation of dietary amino
acids should be based on the combination of L-arginine,
L-lysine, and L-ornithine to stimulate HGH
production. [12] According to Medical Director
Giampapa of the Longevity Institute International
(in Montclair, New Jersey), the optimal oral daily
supplementation of amino acids should include 2
grams arginine plus 2 grams ornithine plus1 gram
lysine plus 1 gram glutamine. [8] Further studies
are required to determine optimal dosages and
combinations of dosages.
To achieve greatest effectiveness as an HGH
releaser, L-arginine should be consumed on an empty
stomach at bedtime. [6, 13] HGH release occurs 30-60
minutes after falling asleep, and also during and
just following vigorous exercise. [4]
Why People Take It
Arthritis. Found in high concentrations in the
connective tissues, arginine is a component of
collagen that plays a vital role in the production
of new tissue and bone cells. [3]
Alzheimer's Patients. Arginine may prove helpful in
treating Alzheimer's, because it raises polyamine
levels. [1]
Cancer Patients. Arginine retards tumor growth by
enhancing immune function. [3, 9] Arginine increases
the size and activity of the thymus gland, which
produces T-cells. Large doses of arginine can lower
polyamines, which are present in various cancers in
elevated levels. [1] Arginine has been found to
inhibit the growth of several types of tumors in
laboratory mice.
Liver Disorders. Arginine aids in liver
detoxification by neutralizing ammonia, and may
benefit in the treatment of liver disorders such as
liver injury, hepatic cirrhosis, and fatty liver
degeneration. [1, 3, 9]
Weight Loss. Arginine facilitates a reduction in
body fat, while increasing lean muscle mass. [3]
Arginine inhibits the absorption of dietary fat.
Body Building. More than fifty research studies
reportedly support the value of arginine
supplementation for athletes. [4] Arginine is
considered to be key to efficient muscle metabolism
because of its role in the transport, storage, and
elimination of nitrogen. Creatine is derived from
arginine, as are guanidophosphate and
phosphoarginine, all of which have roles in muscle
metabolism.
After a vigorous workout, the body has increased
testosterone and HGH production for a period lasting
approximately two hours. During this timeframe,
dietary arginine and ornithine can contribute to a
hormonal environment that produces increased protein
synthesis and muscle growth. [14]
Fertility. Seminal fluid contains substantial
quantities of arginine, and arginine may be
beneficial in treating sterility in men. [13] In one
study, men with low sperm counts took 4 grams of
arginine orally, with 80% of the men showing
significant improvement, in some cases resulting in
pregnancies. [9] Arginine is also noted by one
researcher for its ability to increase libido and
induce erections. [7, 8] Arginine, ornithine, and
aspartic acid have been shown to have a positive
effect on sperm viability and motility. [1]
Inherited Urea Cycle Disorders (Rare). Arginine
therapy is employed in the treatment of arginemia,
citrullinemia, and argininosuccinic aciduria. [1]
Anti-Aging Considerations
Arginine is involved in the production of variety of
enzymes and hormones. Arginine facilitates the
release of HGH, stimulates the pancreas for insulin
production, and is a component in the hormone
vasopressin produced by the pituitary gland. [3] One
mechanism for arginine as an HGH releaser may be its
capacity for blocking secretion of the HGH-inhibitor:
somatostatin. [8]
HGH-release by means of arginine may offer benefits
in the treatment of fractures and injuries, as well
strengthening the immune system, building lean
muscle, burning fat, and reversing many of the
effects of aging. [9]
The elderly respond to arginine with substantially
increased levels of glucose and growth hormone. [1]
A study at the Division of Endocrinology at the
University of Turin involving normal adults aged
66-82 who tripled the level of HGH in their blood
after administration of 30-gram injections of
arginine. [4, 8]
Arginine is essential for optimum growth and in the
regulation of protein metabolism. [1] The main
source of energy for muscle and other cells is
glucose, but glucose metabolism produces ammonia,
which is toxic unless rapidly converted to another
compound. The primary metabolic role of arginine is
in stimulating the enzyme that starts the urea
cycle, which converts ammonia into a less toxic
compound called urea that the blood carries to the
kidneys for excretion.
As a cholesterol fighter, a high ratio of arginine-to-lysine
is recommended. [1] In the urea cycle, citrulline is
a precursor of arginine, so it may be that foods
rich in citrulline (onions, scallions, garlic) lower
cholesterol because the citrulline is converted to
arginine in the body.
As a booster of the immune system, arginine
stimulates the thymus and promotes lymphocyte
production. [9, 10] This may be the key to
arginine's ability to promote healing of burns and
other wounds. During stress (good or bad), the
thymus gland typically shrinks, and sickness
results; however, arginine facilitates the
maintenance of the gland's proper size and normal
production of lymphocytes. [15]
In support of brain function, arginine is believed
to serve as a precursor to nitric oxide (NO), a
neurotransmitter. [1]. Nitric oxide plays a role in
the dilation and constriction of small blood vessels
in brain. Therefore, arginine may have a positive
effect on cerebral circulation. Arginine
pyroglutamate is cited for having
cognitive-enhancing effects. [16]
Related to its neurotransmitter function and its
role as a precursor of NO, L-arginine has been noted
for its critical role in stimulating healthy sex
drive and enhanced sexual performance in men. [7]
In summary, L-arginine is one of the most powerful
tools in any anti-aging program because of its
functional value in promoting the production of HGH
and other hormones, strengthening the immune system,
improving lean muscle mass and reducing fat,
regulating several vital metabolic processes,
improving cholesterol profiles, supporting brain
function, and enhancing sexuality. Hundreds of
studies have been undertaken to date, and clearly
arginine merits further research.
Safety Considerations
The toxicity level for amino acids is 50 to 500
times the therapeutic dose range. [1]
High-dose arginine supplementation may result in
watery diarrhea and sometimes stomach cramps and
headaches.
Individuals with herpes and other viral infections
should not take arginine supplements, because
arginine seems to promote the viral growth. [3, 17]
Persons diagnosed as having schizophrenia are
advised to avoid dietary supplementation of arginine
above 30 milligrams per day. [2, 3]
According to one physician, doses greater than 40
grams per day may pose dangers to patients with
liver and kidney disease. [1] Another expert advises
against any arginine for patients with liver and
kidney disease without the permission of a
physician. [9]
Arginine supplementation is not advised for pregnant
women or nursing mothers [2], nor should
supplemental amino acids be administered to a child.
[3, 9]
References
[1] Braverman, M.D., E.R, The Healing Nutrients
Within (New Canaan, CT: Keats Publishing, Inc.,
1997), pages 18, 21-23, 212, 214, 219-221, 223,
228-229. ISBN 0-87983-706-3
[2] Cooper, M.D., M.P.H., Kenneth H., Advanced
Nutritional Therapies (Nashville: 1996, Thomas
Nelson, Inc. Publishers), pages 87-88, 93, 94. ISBN
0-7852-7302-6
[3]
Balch, M.D., James F., and Balch, C.N.C, Phyllis A.,
Prescription for Nutritional Healing, Second Edition
(Garden City Park, NY: 1997, Avery Publishing
Group), pages 35-36. ISBN 0-89529-727-2
[4]
Colgan, Ph.D., Michael, Optimum Sports Nutrition:
Your Competitive Edge (Ronkonkoma NY: 1993, Advanced
Research Press), pages 268, 330, 333-334. ISBN
0-964840-5-9
[5]
Barbul, A. et al., Surgery, vol. 90, p. 244, 1981,
as cited in Quillin, Ph.D., R.D., Patrick, Healing
Nutrients (New York: 1989, Vintage), page 164. ISBN
0-679-72187-8
[6]
Pearson, Durk and Shaw, Sandy, Life Extension: A
Practical Scientific Approach (New York: 1980,
Warner Books), pages 289, 612. ISBN 0-446-38735-5
[7]
Lamm, M.D., Steven and Couzens, Gerald Secor,
Younger at Last: The New World of Vitality Medicine
(New York: 1997, Simon & Schuster), pages 62-64.
ISBN 0-684-83438-3
[8]
Klatz, D.O., Ronald with Kahn, Carol, Grow Young
with HGH (New York: 1997, HarperCollins Publishers,
Inc.), pages 200, 201, 206, 304. ISBN 0-06-018682-8
[9]
Hendler, M.D., Ph.D., Sheldon Saul, The Doctor's
Vitamin and Mineral Encyclopedia (New York: 1990,
Fireside), pages 209-215. ISBN 0-671-66784-X
[10]
Mindell, Ph.D., Earl, Earl Mindell's Anti-Aging
Bible (New York: 1996, Fireside), pages 23-24. ISBN
0-684-81106-5
[11] Murray, N.D., Michael T. and Pizzorno, N.D.,
Joseph, Encyclopedia of Natural Medicine (Rocklin,
California: 1991, Prima Publishing), page 359. ISBN
0-55958-091-7
[12]
Le Vert, Suzanne, HGH: The Promise of Eternal Youth
(New York: 1997, Avon Books), page 169. ISBN
0-380-78885-3
[13]
Quillin, Ph.D., R.D., Patrick, Healing Nutrients
(New York: 1989, Vintage), pages 274, 368. ISBN
0-679-72187-8
[14]
DiPasqual, M.D., Mauro G., Body Building Supplement
Review (no city listed: 1995, Optimum Training
Systems), page 37.
[15]
Visek, W.J., Journal of Nutrition, vol. 116, p. 36,
Jan. 1986, as cited in Quillin, Ph.D., R.D.,
Patrick, Healing Nutrients (New York: 1989,
Vintage), page 165. ISBN 0-679-72187-8
[16]
Dean, M.D., Ward and Morgenthaler, John, Smart Drugs
& Nutrients (Menlo Park: 1990, Health Freedom
Publications), page 68. ISBN 0-9627418-9-2
[17]
Whitaker, M.D., Julian, Dr. Whitaker's Guide to
Natural Healing (Rocklin, California: Prima
Publishing, 1996), page 269. ISBN 1-55958-495-5
Vitality Research Institute is dedicated to
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The information provided by Vitality Research
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is not intended nor should it be utilized as medical
advice; each individual's specific health situation
is unique, and individuals should seek the advice of
a Healthcare professional in matters related to his
or her health and well-being.
Effects of L-Arginine on vascular smooth muscle cell
proliferation and apoptosis after balloon injury.
Holm AM, Andersen CB, Haunso S, Hansen PR.
Department of Medicine, Rigshospital, Copenhagen. amholm@hotmail.com
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10816057&dopt=Abstract
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