Glycyrrhiza glabra


Other Names:



  • Antiviral
  • Antiulcer
  • Anti-inflammatory
  • Antioxidant
  • Antitumor
  • Antibacterial
  • Immunity
  • Gastroprotective
  • Heptoprotective
Licorice (Glycyrrhiza glabra) root is a perennial herb which has a long history of use in ancient Assyrian, Egyptian, Chinese, and Indian cultures. It is sold as a dietary supplement for digestive and respiratory issues and bacterial and viral infections. It also often an ingredient in some products for topical use.

Licorice root is sold as a powder, extract, or in capsules. Potential side effects of licorice root, if given in large amounts or over a long period of time include increased blood pressure and decreased potassium levels. These effects may be a concern for birds with heart or kidney disease.

Specific applications studied in poultry include:
  • Antiviral: Licorice possesses some antiviral activity in vitro toward a number of viruses---including Newcastle disease virus (NDV) in chickens and Duck Hepatitis Virus (DHV) in ducks. In a study conducted on 40 day-old white Pekin domestic ducklings, treatment with glycyrrhizin alone or with DHV vaccine demonstrated to be an effective immune system booster and had an antiviral effect against DHV.
  • Gut health: Adding licorice extract to the diet at 1 g/kg of diet improved the growth performance of broiler chickens, as well as influenced the maintenance of intestinal integrity and reduced Campylobacter jejuni shedding from infected birds. (D Ibrahim et al., 2020)


Scientific References