Tauroursodeoxycholic acid , more commonly known as TUDCA, is an ambiphilic bile salt, the taurine conjugated form of ursodeoxycholic acid (UDCA).
That's a bunch of long words, but don't worry, we'll explain everything for you here.
TUDCA is implicated in many protective effects in the body, primarily aiding in treatment of cholestasis, a condition that blocks or slows the flow of bile from the liver. However, as you'll read in this article, there are a number of additional positive effects of TUDCA that go beyond the liver.
This section will explain some general concepts of bile acid synthesis, and give a simple explanation of relevant terms.
Bile is a bitter fluid that circulates from the liver to the duodenum (the first part of the small intestine) and aids in metabolism and the digestion of fats.
Primary bile acids are synthesized in the liver via oxidation of cholesterol into cholic acid and chenodeoxycholic acid. This process is rate-limited by an enzyme that is upregulated by cholesterol and downregulated by cholic acid.
Secondary bile acids are synthesized in the small intestine via intestinal bacteria (by dehydroxylating them into deoxycholic acid and lithocholic acid). There are additional forms of the secondary bile acids where the hydroxyl substitutions happen at different places on the molecule. Ursodeoxycholic acid (UDCA) is one of them, the prefix 'urso' hailing to the fact that this acid was first isolated from bears. These acids are typically found in only trace amounts in humans -- if at all.
Conjugated bile acids are acids that have been conjugated to a group that grants additional water solubility. These conjugates come in a wide range of forms but often include amino acids that are of particular interest to us. The amino acid taurine is one of these, and can be conjugated to UDCA to form our compound of interest, tauroursodeoxycholic acid (TUDCA).
Tauro + Urso + Deoxy + Cholic Acid
(Taurine conjugated) + (Found in bears) + (Dehydroxylated) + (Primary bile acid)
The cholestasis problem
Cholestasis is a condition in which the regular bile acids cannot flow from the liver to the intestine. It can be caused by a physical blockage (which TUDCA will not help with) or as a metabolic side effect of many substances (such as anabolic steroids). This dangerous condition reduces the digestion of fats, and can result in jaundice and destruction of tissue in the liver.
Cholestasis in athletes can be caused by supplementation with prohormones, because steroids and prohormones are hepatotoxic. This can be further compounded by the use of methylated oral steroids since they pass through the liver repeatedly via the very process of enterohepatic circulation that is inhibited by cholestasis. This causes repetitive and extended stress on the liver and can result in major metabolic cholestasis.
When cholestasis is in effect, it triggers receptors (aptly named 'death receptors') that causes apoptosis (cell death). TUDCA and other hydrophilic bile acids exert a cytoprotective effect on cells (that is, they prevent cell death) by triggering receptors that promote cell survival.
This a very simplified explanation of the issue, and if you want to learn more, the linked articles are in mostly understandable terms. By increasing the portion of TUDCA in bile compared to harmful bile salts, you're diluting the ratio of harmful to protective bile acids.
- TUDCA exhibits neuroprotective effects, it can protect the brain against stroke and neurological injury, as well as the symptoms of various neurological diseases.[4, 5, 6, 7]
- TUDCA's protection from cell death extends to cell death in general beyond that of just the liver via attenuating endoplasmic reticulum stress.[8, 9]
- It has been demonstrated to restore glucose homeostasis in the liver, muscle, and fatty tissue. This is probably linked to its attenuation of ER stress. But the exact method behind this action is unknown. In a separate study on humans, TUDCA was shown to increase insulin sensitivity in liver and muscle but not fatty tissue.
- TUDCA has undergone numerous studies on its potential for increasing metabolic rate, however most of these have been in animals, and the results are inconclusive.
- In rats, TUDCA supplementation increased circulating adiponectin levels. Levels of this protein are reduced by obesity and it is responsible for regulating glucose levels as well as fatty acid metabolism.
- TUDCA can reduce damage to the liver caused by alcohol when taken with or after consumption of alcohol, but actually increases liver damage when taken before drinking.[12, 13]
Safety and side effects
TUDCA underwent a year long safety study in humans and was not associated with any adverse effects at all when taken at 500mg daily. In the human study on insulin sensitivity, no adverse effects were noted when consumed at 1,750mg daily for a four weeks.
This establishes a good record for safety in humans, something worth touting as many dietary supplements do not have this going for them.
On that note, 500mg per day seems to be the preferred dosage. Some products have 250mg dosages, which can be taken one to two times per day.
As always, talk with your doctor before beginning any diet or supplementation program, especially with an advanced product like this one. An endocrinologist may help as well, if you are taking this for treatment of hormonal problems.
Where to buy
There are several companies that have TUDCA products on the market. Check out our price comparison on this page to see which sites offer the cheapest products. Chances are you'll save 30% to 50% off retail.
For a pure product, check out Premium Powders.
- Ishak KG, Zimmerman HJ.; Seminars in Liver Disease; "Hepatotoxic effects of the anabolic/androgenic steroids;" August 1987
- Joana D. Amaral, et. al.; The Journal of Lipid Research; "Bile acids: regulation of apoptosis by ursodeoxycholic acid;" September 2009
- Schoemaker MH, et. al.; Hepatology; "Tauroursodeoxycholic acid protects rat hepatocytes from bile acid-induced apoptosis via activation of survival pathways;" June 2004
- Rodrigues CM., et. al.; Proceedings of the National Academy of Sciences of the United States of America; "Tauroursodeoxycholic acid reduces apoptosis and protects against neurological injury after acute hemorrhagic stroke in rats;" May 2003
- Rodrigues CM., et al.; Journal of Cerebral Blood Flow and Metabolism; "Neuroprotection by a bile acid in an acute stroke model in the rat;" April 2002
- Dwan WN., et. al.; Cell Transplantation; "Tauroursodeoxycholic acid improves the survival and function of nigral transplants in a rat model of Parkinson's disease;" 2002
- Ramalho RM; Journal of Neurochemistry; "Tauroursodeoxycholic acid modulates p53-mediated apoptosis in Alzheimer's disease mutant neuroblastoma cells;" September 2006
- Amaral JD., et. al.; The Journal of Lipid Research; "Bile acids: regulation of apoptosis by ursodeoxycholic acid;" September 2009
- Ben Mosbah I., et. al.; Cell Death and Disease; "Endoplasmic reticulum stress inhibition protects steatotic and non-steatotic livers in partial hepatectomy under ischemia-reperfusion;" July 2010
- Ozcan U.; Science; "Chemical chaperones reduce ER stress and restore glucose homeostasis in a mouse model of type 2 diabetes;" August 2006
- Kars M., Diabetes; "Tauroursodeoxycholic Acid may improve liver and muscle but not adipose tissue insulin sensitivity in obese men and women;" August 2010
- Henzel K., et. al.; Biochimica et Biophysica Acta; "Toxicity of ethanol and acetaldehyde in hepatocytes treated with ursodeoxycholic or tauroursodeoxycholic acid;" February 2004
- Neuman MG, et. al.; Gastroenterology; "Effect of tauroursodeoxycholic and ursodeoxycholic acid on ethanol-induced cell injuries in the human Hep G2 cell line;" August 1995
- Angelico M. et. al.; Italian Journal of Gastroenterology and Hepatology; "One-year pilot study on tauroursodeoxycholic acid as an adjuvant treatment after liver transplantation;" August-September 1999
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