These properties of curcumin have been shown in several animal studies, he notes, but there have been relatively few studies in people. So his team designed a randomised controlled clinical trial to see if short-term use of a curcumin supplement could reduce inflammation in people with metabolic syndrome, a cluster of risk factors for heart disease.
Having a large waistline, high blood pressure, high blood sugar, low levels of HDL (good) cholesterol and high levels of triglycerides, are among the factors that make up metabolic syndrome. People with three or more of these classic traits are at higher than average risk of developing heart disease or diabetes or both.
Inflammation is also emerging as a feature of metabolic syndrome, Sahebkar’s team writes in the journal Clinical Nutrition. They set out to see if curcumin supplements could at least roll back that risk factor by enrolling participants who had been diagnosed with metabolic syndrome for their study.
Half were given pills containing one gram of curcumin powder, and the other half were given similar looking pills with no curcumin inside. All the participants took the supplements every day for eight weeks.
The researchers then measured levels of three blood markers of inflammation, including C-reactive protein (CRP), which has been linked with heart disease risk.
They found that the people who took curcumin had improved blood levels of all three biomarkers as well as reduced fasting blood sugar and haemoglobin A1c, a measure of long-term blood sugar levels. The comparison group had higher glucose and levels of one of the inflammation markers, and no changes in the other markers.
The study team also analysed data from eight previous studies and confirmed that curcumin had shown a significant reduction of CRP concentrations in patients.
“The findings of our studies, along with clinical findings reported by other groups, indicate the usefulness of daily use of curcumin supplement for the prevention and treatment of several diseases,” Sahebkar says.
The researchers didn’t examine the effect of curcumin on any diseases, and it was a fairly brief study, so it’s not clear what the long-term implications may be they caution in their report.
The study was funded by the Clinical Trial Research Center in Tehran and the Iran National Science Foundation. One of the authors is CEO of Sabinsa Corporation and Sami Labs Ltd, manufacturers of curcumin supplements.
Sahebkar says most of the clinical benefits reported for curcumin have been achieved when curcumin was added to a standard drug therapy regimen, and patients should be careful not to replace their prescribed drugs with curcumin without prior consultation with their physician.
“Curcumin is a very safe natural supplement, and there is no severe adverse event associated with its use, even at high doses,” Sahebkar says.
However, owing to limited safety information, pregnant and lactating women should avoid using this supplement, Sahebkar says.
“In addition, patients with mal-absorption syndrome, gall bladder problems, gastric ulcer, bleeding problems as well as those who are undergoing surgery, and those who have a history of hypersensitivity to herbal products should be cautious and consult with their physician before taking this supplement,” Sahebkar says.
Sahebkar added that he is often asked about the possibility of using turmeric instead of pure curcumin supplements.
“Whilst turmeric is known to have several medicinal properties, and its regular use in diet is strongly suggested, it cannot be regarded as an equivalent substitution of curcumin,” he says.
Sahebkar says turmeric contains very low quantities of curcumin, usually less than 5 percent, and curcumin has a very low absorption in its raw form, usually less than one percent of raw curcumin is absorbed when taken orally. – Reuters
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