Curcuma longa Hepatotoxicity: A Baseless Accusation. Cases Assessed for Causality Using RUCAM Method

Area of Science:

• Pharmacology
• Hepatology
• Nutraceuticals

Background:

• Curcuma longa (turmeric) and its active compound curcumin are widely recognized for health benefits and antioxidant effects.
• Recent reports indicate potential hepatotoxicity linked to Curcuma longa supplements, challenging its
• generally safe
• status.

Purpose of the Study:

• To investigate the potential causes of hepatotoxicity associated with Curcuma longa consumption.
• To explore the role of piperine in enhancing curcumin bioavailability and its potential contribution to adverse effects.

Main Methods:

• Literature review of scientific articles and global surveillance data on Curcuma longa and curcumin safety.
• Analysis of the pharmacokinetic interactions between curcumin and piperine, including piperine's inhibition of drug metabolism (CYP3A4, P-glycoprotein).
• Assessment of reported hepatotoxicity cases using the Roussel Uclaf Causality Assessment Method (RUCAM).

Main Results:

• Curcumin is generally considered safe by the U.S. Food and Drug Administration (FDA) with antioxidant properties.
• Piperine significantly increases curcumin bioavailability by inhibiting drug metabolism pathways.
• Few hepatotoxicity cases are reported for curcumin-piperine combinations, suggesting piperine as a potential contributor to toxicity.

Conclusions:

• The suspected hepatotoxicity of Curcuma longa supplements may be attributed to the co-administration of piperine, which enhances curcumin bioavailability.
• Further basic research is required to elucidate the mechanisms of curcumin and curcumin-piperine-induced hepatotoxicity.
• Human trials are necessary to definitively resolve the safety concerns surrounding Curcuma longa and piperine combinations in supplements.