Overview
Taurine: It’s not just ‘bull’: both cats and humans decline when their diets contain too little taurine.
Taurine is a sulfur-containing amino acid that is not utilized to make proteins but is involved in a variety of different
physiological processes.
The body synthesizes too little taurine to consistently meet the body’s needs for it — therefore, a dietary source is required
in order to avoid deficiency diseases.
Taurine deficiencies occur in various mammals, including
humans and cats. During pregnancy, taurine deficiency in the mother
leads to retarded growth of the offspring, and to impaired
development of the central nervous system and of the pancreatic
insulin-producing structures. The adult offspring of
taurine-deficient mothers have impaired glucose tolerance, impaired
neurological
function, and vascular dysfunction; they may develop
gestational diabetes and transmit these defects to the next generation.
In adult humans, taurine has been used to treat:
- cardiovascular diseases
- high cholesterol levels
- epilepsy and other seizure disorders
- macular degeneration
- Alzheimer’s disease
- liver disorders
- alcoholism
- cystic fibrosis.
- In cats, taurine is used mainly for preventing deficiency diseases:
- retinal degeneration
- cardiomyopathy
- impaired immune function
- abnormal growth and development.
For human supplementation, 3-4 grams per day in divided doses should maximize one’s chances of obtaining a positive effect
without encountering side effects.
For fortifying cat food, the amount usually recommended is 1200-2500 mg taurine for each kilogram of food (about 550-1150
mg per pound of food, or 33-70 mg per ounce).
Read Taurine Monograph
Taurine
is a sulfur-containing amino acid that is not utilized in protein
synthesis, but rather is normally found in the body as simple free
molecules. It is a ‘conditionally-essential’ amino acid inasmuch as the
body synthesizes too little of it to consistently meet the body’s needs
for it — therefore, a dietary source is required in order to avoid
deficiency diseases.
What we can’t tell you
In
the U.S. and some other industrialized countries, government agencies
like the U.S. Food and Drug Administration have adopted censorship as a
method for intensifying their control over the supplement industry and
its customers. Thus, FDA regulations prohibit us from telling you that
any of our products are effective as medical treatments, even if they are, in fact, effective.
Accordingly, we will limit our discussion of L-taurine to a brief summary of recent taurine research, and let you draw your
own conclusions about what medical conditions it may be effective in treating.
Taurine is involved in a variety of different physiological processes, including:
- the conversion of metabolic wastes into water-soluble salts
- regulation of calcium ion flux across membranes
- membrane stabilization
- detoxification of pro-oxidants such as hypochlorous acid and chloro-carbons
- normal development of fetal tissues
Taurine deficiencies occur in various mammals, including humans and cats.
During pregnancy, taurine deficiency in the mother leads to retarded
growth of the offspring, and to impaired development of the central
nervous system and of the pancreatic insulin-producing structures. The
adult offspring of taurine-deficient mothers have impaired glucose
tolerance, impaired neurological function, and vascular dysfunction;
they may develop gestational diabetes and transmit these defects to the
next generation.
In
adult humans, taurine has been used with varying degrees of success to
treat a wide variety of conditions, including: cardiovascular diseases,
hypercholesterolemia, epilepsy and other seizure disorders, macular
degeneration, Alzheimer’s disease, hepatic disorders, alcoholism, and
cystic fibrosis.
In cats, taurine is used mainly for preventing deficiency diseases: retinal degeneration, cardiomyopathy, altered white-cell
function, and abnormal growth and development.
Cardiovascular effects
Oral
taurine treatment has been studied extensively as an agent for lowering
high blood pressure. Its beneficial effects have been demonstrated both
in rats and in humans. In human subjects suffering essential
hypertension, taurine supplementation at 6 g/day for as little as 7
days resulted in measurable decreases in blood pressure.
It
has been known for more than 20 years that taurine supplementation
improves the function of the heart in people with congestive heart
failure (a weakness of the heart muscle).
The medical world, however, has shown very little interest in this
treatment, preferring instead to treat with expensive prescription
drugs. Veterinarians, on the other hand, continue to use taurine to
treat similar conditions in cats and sometimes in dogs.
A clinical trial in which overweight and obese men were given taurine at 3 g/day caused significant reductions in serum fatty
acid levels, and reduced the subjects’ bodyweights.
The
seriousness of damage to arteries from atherosclerosis (‘hardening of
the arteries’) is often measured by the amount of calcium in the fatty
deposits in the arterial walls. Less calcium means less disease
progression. Research published in 2002 demonstrated that calcification
of vascular smooth muscle cells could be alleviated by taurine. Taurine
treatment appeared to be more beneficial when the treatment was started
earlier.
In a 2004 study of rabbits genetically predisposed to cardiovascular disease, a 24-week treatment (0.3% taurine in drinking
water) decreased atherosclerotic deposits in the aortas by 31%.
Considering
the promising results obtained in cell culture and animal studies, one
might assume that studies in humans would have proceeded forthwith. But
one would be wrong — not a single clinical study in humans has been
reported in the medical literature. Meanwhile, millions of humans die
each year from the effects of atherosclerosis. Billions of dollars are
spent on statin drugs, surgical procedures, special diets, and exercise
programs, while the concept of taurine supplementation is left
unexplored.
However, there is nothing stopping us (in the USA, at least) from buying a taurine supplement and trying it for ourselves.
Studies of taurine used for other purposes have consistently shown it to be safe and without side effects.
Epilepsy
The use of taurine supplementation to treat epilepsy and other seizure disorders has been studied since the 1970s. Although substantial improvements were reported, critics have called these studies into question for methodological reasons. Nevertheless, as stated above, patients have easy access to this supplement and can choose for themselves whether or not
to use it.
Diabetes
Experimental data suggest strongly that taurine could have beneficial effects in diabetic patients. Taurine was especially useful for preventing diabetic damage to retina, eye lenses and nerves. The bulk of experimental data suggests that taurine administration could be useful in the treatment of type 1 (childhood-onset)
diabetes and in the prevention of insulin resistance, but not in type 2 (adult-onset) diabetes.
Taurine in cats
Wild
cat species are carnivores and presumably obtain adequate amounts of
taurine in the uncooked meat they consume. Domestic cats, on the other
hand, depend largely on food prepared for them by humans, often from
vegetable sources which are low in taurine. Pet cats are therefore
especially prone to suffer taurine deficiencies. The effects are what
one would expect: developmental abnormalities, heart defects,
cardiovascular disease, retinal failure, altered white-cell function,
and diabetic symptoms.
Most commercial cat food is now fortified with taurine. But taurine is lost or destroyed when food is cooked, especially if
cooked in water.
This is how some taurine deficiences occur. When taurine is added to
low-taurine food, an adequate amount is thought to be in the range of
1200-2500 mg taurine for each kilogram of food (about 550-1150 mg per
pound of food, or 33-70 mg per ounce).
Supplementation in adult humans
Supplement
companies tend to take a conservative approach in suggesting dosages of
taurine — 500 mg three times per day is typical. Clinical trials often
use more — up to 6 g per day in one trial mentioned above. Doses of
around 5 grams a day sometimes cause loose stools, according to
DrLam.com. It follows, therefore, that regimen of about 4 grams per day in divided doses should maximize one’s chances of obtaining
a positive effect without encountering side effects.
Conclusion
Are L-taurine supplements useful for the conditions and purposes mentioned above? We aren’t allowed to tell you, so you should
take a look at some of the references cited here, and then decide for yourself.
References
[1a] Therapeutic applications of taurine [abstract only] Altern Med Rev. 1998 Apr;3(2):128-36. Birdsall TC
[1b] Therapeutic Applications of Taurine [PDF, 53KB] Thorne.com website Birdsall TC
[2] Taurine deficiency syndrome in cats Vet Clin North Am Small Anim Pract. 1989 May;19(3):403-13. Hayes KC, Trautwein EA
[3] [The amino acid taurine—physiology and pathophysiology][Article in German] Schweiz Arch Tierheilkd. 1991;133(10):467-76. Wolffram S
[4] Taurine review The Abyssinian Homepage website Ch. M. Ruessheim
[5] Taurine suppresses development of atherosclerosis in Watanabe heritable hyperlipidemic (WHHL) rabbits. Atherosclerosis. 2002 Jul;163(1):79-87. Murakami S, Kondo Y, Sakurai T, Kitajima H, Nagate T
[6] Taurine prevents beta-glycerophosphate-induced calcification in cultured rat vascular smooth muscle cells. Heart Vessels. 2004 May;19(3):125-31. Li J, Zhang B, Huang Z, Wang S, Tang C, Du J
[7] Treatment of hypertension with oral taurine: experimental and clinical studies Amino Acids. 2002;23(4):381-93. Militante JD, Lombardini JB
[8] Therapeutic effect of taurine in congestive heart failure: a double-blind crossover trial Clin Cardiol. 1985 May;8(5):276-82. Azuma J, Sawamura A, Awata N, Ohta H, Hamaguchi T, Harada H, Takihara K, Hasegawa H, Yamagami T, Ishiyama T, et al.
[9] Usefulness of taurine in chronic congestive heart failure and its prospective application Jpn Circ J. 1992 Jan;56(1):95-9. Azuma J, Sawamura A, Awata N
[10] Nutritional and herbal therapies in the treatment of heart disease in cats and dogs J Am Anim Hosp Assoc. 2005 Nov-Dec;41(6):355-67. Gompf RE
[11] Taurine monograph PDRhealth website
[12] Taurine monograph [PDF, 24KB] Thorne website
[13] [Therapeutic effects of taurine in epilepsy: a clinical and polyphysiographic study (author’s transl)][Article in Italian] Riv Patol Nerv Ment. 1975 May-Jun;96(3):166-84. Marchesi GF, Quattrini A, Scarpino O, Dellantonio R
[14] Therapeutic trial by taurine for intractable childhood epilepsies Brain Dev. 1982;4(1):63-9. Fukuyama Y, Ochiai Y
[15] Taurine supplementation and diabetes mellitus Curr Opin Clin Nutr Metab Care. 2006 Jan;9(1):32-6. Franconi F, Loizzo A, Ghirlanda G, Seghieri G
[16] Is taurine beneficial in reducing risk factors for diabetes mellitus? Neurochem Res. 2004 Jan;29(1):143-50. Franconi F, Di Leo MA, Bennardini F, Ghirlanda G
[17] Beneficial effects of taurine on serum lipids in overweight or obese non-diabetic subjects. Amino Acids. 2004 Jun;26(3):267-71. Epub 2003 Dec 15. Zhang M, Bi LF, Fang JH, Su XL, Da GL, Kuwamori T, Kagamimori S
[18] Taurine and taurine-deficiency in the perinatal period J Perinat Med. 2002;30(4):281-6. Aerts L, Van Assche FA
[19] Taurine article Feline Future Cat Food Company website
[20] Taurine article Dr Lam’s website