Ox bile

What ox bile is

The liver makes bile acids itself. With the bile they reach the small intestine, where they make dietary fat digestible. Ox bile extract from dried beef bile supplies a mixture of natural conjugated bile acids. A related bile acid that has been studied on its own is TUDCA.

The BK-Score gives 2 out of 10 points for human evidence. The principle has been shown in genuine bile acid deficiency; the advertised use after gallbladder surgery has not been studied.

How it works

In short bowel syndrome, bile acids are lost through the gut, too few reach the duodenum, and fat is poorly digested. Supplemental bile acids can close this gap; balance studies measured how much fat is actually absorbed afterwards.

After removal of the gallbladder the situation is different. Bile continues to flow into the duodenum, just without intermediate storage. Some of those who have had the operation tend to develop diarrhea instead, because more bile acids reach the colon, where they draw water and salts into the gut.

What the studies show

Short bowel with stoma: Gruy-Kapral 1999

The study examined a severely emaciated patient with short bowel syndrome and an ileostomy in whom intravenous nutrition was not possible. In balance studies, both natural bile acids from ox bile and the synthetic cholylsarcosine increased fat absorption by about 40 g per day; calcium absorption also rose. Stoma output did not increase appreciably. In a four-month trial with 2 g of natural bile acids per meal, her weight rose from 80 to 98 pounds, without side effects.

Short bowel with colon: Emmett 2003

In a patient with short bowel, a preserved colon, elevated urinary oxalate and kidney stones, 9 g of natural conjugated bile acids per day lowered fecal fat excretion from 119 to 79 g per day and urinary oxalate from 87 to 64 mg per day. In a three-month trial at home, oxalate normalized, the patient gained weight and was less hungry. The synthetic cholylsarcosine had a similar but weaker effect.

Ox bile versus cholylsarcosine: Kapral 2004

Four short bowel patients with a preserved colon received the synthetic cholylsarcosine, two of them also ox bile extract for comparison. Cholylsarcosine increased fat absorption from 65.5 to 94.5 g per day. Natural bile acids also reduced fat loss, but less, and markedly worsened diarrhea. The authors stress that, because the condition is rare, the study was not controlled.

After gallbladder removal: Mao 2025 and Huang 2023

In a telephone follow-up survey of 3,385 people after laparoscopic gallbladder removal in China, 14.2 percent had diarrhea after the operation in the first year. A review describes the main cause as bile acids that continue to flow into the gut after the operation and arrive in the colon in larger amounts. We did not find a study testing ox bile after gallbladder removal.

Where the data stop

• After gallbladder surgery. No study, and it has not been shown that people who have had the operation lack bile acids.
• In healthy people. No data on digestion, bloating or nutrient absorption.
• Controlled studies. All human data come from individual cases and very small series, without placebo.
• Diarrhea as a risk. Precisely the complaint that is common after the operation was worsened by natural bile acids in a short bowel series.

Status, approval and legal

Ox bile extract is sold in Germany as a food supplement. Health claims on fat digestion are not authorized for it in the EU; bile does not appear in the list under Regulation (EU) No 432/2012. We did not find an official assessment of ox bile as a food ingredient by EFSA or the BfR.

Pure cholic acid is approved as a medicine in the EU: Orphacol since September 12, 2013, for adults and children from one month of age with two rare inborn enzyme defects of bile acid synthesis. It is prescription-only; treatment is started and monitored by a physician specializing in liver disease.

Safety

Reliable safety data are lacking. In the short bowel studies, natural bile acids were taken for weeks to months, by one patient without side effects, by two patients with a preserved colon with markedly more diarrhea. Anyone who has diarrhea after gallbladder removal should have the cause clarified by a doctor, because excess bile acids are precisely a common cause there.

The BK-Score puts safety at 2 out of 10 points; this axis measures how well safety has been studied, not how safe the substance is. This text is information and does not replace medical advice.

Sources

• Gruy-Kapral C et al., Gastroenterology 1999 – balance study, short bowel with ileostomy, ox bile and cholylsarcosine
• Emmett M et al., Am J Kidney Dis 2003 – balance study, short bowel with colon, fat and oxalate excretion
• Kapral C et al., Z Gastroenterol 2004 – 4 short bowel patients, cholylsarcosine and ox bile extract
• Huang RL et al., World J Gastrointest Surg 2023 – review, diarrhea after gallbladder removal
• Mao F et al., BMC Gastroenterol 2025 – follow-up survey of 3,385 patients, diarrhea after gallbladder removal
• EMA – Orphacol (cholic acid), EPAR summary, EU approval 2013-09-12
• Regulation (EU) No 432/2012 – list of permitted health claims made on foods