Licorice root safety studies
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Licorice Root Safety Profile: Toxicity, Tolerability, and Adverse Effects
Acute and Subchronic Toxicity Studies in Animals
Multiple studies have evaluated the safety of licorice root extracts in animal models. Acute and subchronic toxicity tests in mice, using high doses of nonpolar licorice root extract (up to 2,000 mg/kg acutely and up to 1,000 mg/kg daily for 120 days), showed no significant toxic effects, changes in blood pressure, blood parameters, or organ histopathology, indicating a favorable safety profile at these doses . Similarly, licorice root extract demonstrated no irritability or toxicity in the in vivo hen egg test-chorioallantoic membrane (HET-CAM) protocol, supporting its biocompatibility and tolerability .
Heavy Metal and Contaminant Safety
Licorice root extracts have been tested for heavy metal contamination, with studies showing that levels of lead, cadmium, arsenic, nickel, and cobalt are below detection limits, further supporting the safety of licorice root products for human use 19.
Clinical and Human Safety Data
Clinical reviews and meta-analyses highlight that licorice root is generally safe when used appropriately, but chronic or excessive consumption can lead to adverse effects. The most notable risks are related to its mineralocorticoid-like activity, which can cause hypertension and hypokalemia, especially in sensitive individuals or with prolonged use 3610. These side effects are more likely in populations with predisposing factors such as older age, female sex, or pre-existing health conditions .
Safety in Food Applications
Licorice root extract has been evaluated as a sugar substitute in bakery products, with safety assessments confirming that it does not pose risks to human health when used in food, provided it meets regulatory standards for contaminants .
Topical and Short-Term Use
Topical application of licorice, such as for preventing postoperative sore throat, has been shown to be effective and safe, with no significant adverse events reported in randomized controlled trials .
Special Considerations and Cautions
While licorice root and its main component glycyrrhizin are generally safe, moderate toxicity has been reported, and caution is advised during pregnancy and in individuals at risk for hypertension or electrolyte imbalances 610. Licorice may also interact with certain medications and should be used carefully in those with underlying health conditions.
Protective and Hepatoprotective Effects
Licorice root has demonstrated protective effects against various toxins and drug-induced liver damage in animal studies, suggesting additional safety benefits in specific contexts 478.
Conclusion
Licorice root is widely regarded as safe for most people when used in moderation and for short durations. Animal and human studies support its low toxicity and good tolerability, with rare adverse effects primarily associated with chronic or excessive intake. Monitoring for potential side effects, especially in sensitive populations, is recommended. Overall, licorice root extract is a safe ingredient for therapeutic, food, and topical applications when used responsibly 1235+4 MORE.
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