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Glycyrrhizic acid
Glycyrrhizic Acid.svg
Glycyrrhizin zwitterion ball-and-stick xtal 2009.png
Clinical data
Trade names Epigen, Glycyron
AHFS/ International Drug Names
Routes of
Oral, intravenous
ATC code
Pharmacokinetic data
Metabolism Hepatic and by intestinal bacteria
Biological half-life 6.2-10.2 hours[1]
Excretion Faeces, urine (0.31-0.67%)[2]
CAS Number
PubChem CID
E number E958 (glazing agents, ...)
ECHA InfoCard 100.014.350
Chemical and physical data
Formula C42H62O16
Molar mass 822.93 g/mol
3D model (JSmol)
Solubility in water 1-10 mg/mL (20 °C)

Glycyrrhizin (or glycyrrhizic acid or glycyrrhizinic acid) is the chief sweet-tasting constituent of Glycyrrhiza glabra (liquorice) root. Structurally it is a saponin and has been used as an emulsifier and gel-forming agent in foodstuff and cosmetics. Its aglycone is enoxolone and it has therefore been used as a prodrug for that compound, for example it is used in Japan to prevent liver carcinogenesis in patients with chronic hepatitis C.[3]

Medical uses[edit]

Glycyrrhizin inhibits liver cell injury and is given intravenously for the treatment of chronic viral hepatitis and cirrhosis in Japan.[4][5] In one small scale preliminary clinical trial, it was found that early treatment with glycyrrhizin might prevent disease progression in patients with acute onset autoimmune hepatitis.[6]

Adverse effects[edit]

The most widely reported side effects of glycyrrhizin use are fluid retention. These effects are related to the inhibition of cortisol metabolism within the kidney, and the subsequent stimulation of the mineralocorticoid receptors.[7] Other side effects include:[8]

Mechanism of action[edit]

It inhibits the enzyme 11β-hydroxysteroid dehydrogenase, which likely contributes to its anti-inflammatory and mineralocorticoid activity.[8] It has a broad-spectrum of antiviral activity in vitro against:[8][9]


After oral ingestion, glycyrrhizin is first hydrolysed to 18β-glycyrrhetinic acid by intestinal bacteria. After complete absorption from the gut, β-glycyrrhetinic acid is metabolised to 3β-monoglucuronyl-18β-glycyrrhetinic acid in the liver. This metabolite then circulates in the bloodstream. Consequently, its oral bioavailability is poor. The main part is eliminated by bile and only a minor part (0.31–0.67%) by urine.[14] After oral ingestion of 600 mg of glycyrrhizin the metabolite appeared in urine after 1.5 to 14 hours. Maximal concentrations (0.49 to 2.69 mg/l) were achieved after 1.5 to 39 hours and metabolite can be detected in the urine after 2 to 4 days.[14]

Organoleptic properties[edit]

It is 30-50 times as sweet as sucrose (table sugar).[8][15]

See also[edit]


  1. ^ van Rossum, TG; Vulto, AG; Hop, WC; Schalm, SW (December 1999). "Pharmacokinetics of intravenous glycyrrhizin after single and multiple doses in patients with chronic hepatitis C infection.". Clinical Therapeutics. 21 (12): 2080–90. PMID 10645755. doi:10.1016/S0149-2918(00)87239-2. 
  2. ^ Ploeger, B; Mensinga, T; Sips, A; Seinen, W; Meulenbelt, J; DeJongh, J (May 2001). "The pharmacokinetics of glycyrrhizic acid evaluated by physiologically based pharmacokinetic modeling.". Drug Metabolism Reviews. 33 (2): 125–47. PMID 11495500. doi:10.1081/DMR-100104400. 
  3. ^ Arase, Yasuji; Ikeda, Kenji; Murashima, Naoya; Chayama, Kazuaki; Tsubota, Akihito; Koida, Isao; Suzuki, Yoshiyuki; Saitoh, Satoshi; Kobayashi, Masahiro; Kumada, Hiromitsu (15 April 1997). "The long term efficacy of glycyrrhizin in chronic hepatitis C patients". Cancer. 79 (8): 1494–1500. doi:10.1002/(SICI)1097-0142(19970415)79:8<1494::AID-CNCR8>3.0.CO;2-B. 
  4. ^ Sato, H; Goto, W; Yamamura, J; Kurokawa, M; Kageyama, S; Takahara, T; Watanabe, A; Shiraki, K (May 1996). "Therapeutic basis of glycyrrhizin on chronic hepatitis B.". Antiviral Research. 30 (2-3): 171–7. PMID 8783808. doi:10.1016/0166-3542(96)00942-4. 
  5. ^ van Rossum, TG; Vulto, AG; de Man, RA; Brouwer, JT; Schalm, SW (March 1998). "Review article: glycyrrhizin as a potential treatment for chronic hepatitis C." (PDF). Alimentary Pharmacology & Therapeutics. 12 (3): 199–205. PMID 9570253. doi:10.1046/j.1365-2036.1998.00309.x. 
  6. ^ Yasui, S; Fujiwara, K; Tawada, A; Fukuda, Y; Nakano, M; Yokosuka, O (December 2011). "Efficacy of intravenous glycyrrhizin in the early stage of acute onset autoimmune hepatitis.". Digestive Diseases and Sciences. 56 (12): 3638–47. PMID 21681505. doi:10.1007/s10620-011-1789-5. 
  7. ^ Ferrari, P.; Sansonnens, A.; Dick, B.; Frey, F. J. (2001). "In Vivo 11 -HSD-2 Activity: Variability, Salt-Sensitivity, and Effect of Licorice". Hypertension. 38 (6): 1330–6. PMID 11751713. doi:10.1161/hy1101.096112. 
  8. ^ a b c d Asl, MN; Hosseinzadeh, H (June 2008). "Review of pharmacological effects of Glycyrrhiza sp. and its bioactive compounds." (PDF). Phytotherapy Research. 22 (6): 709–24. PMID 18446848. doi:10.1002/ptr.2362. 
  9. ^ Shamsa, F; Ohtsuki, K; Hasanzadeh, E; Rezazadeh, S (2010). "The Anti-inflammatory and Anti-viral Effects of an Ethnic Medicine: Glycyrrhizin" (PDF). Journal of Medicinal Plants. 9 (Suppl. 2): 1389. 
  10. ^ Pompei, Raffaello; Flore, Ornella; Marccialis, Maria Antonietta; Pani, Alessandra; Loddo, Bernardo (1979). "Glycyrrhizic acid inhibits virus growth and inactivates virus particles". Nature. 281 (5733): 689–90. PMID 233133. doi:10.1038/281689a0. 
  11. ^ Sekizawa, T; Yanagi, K; Itoyama, Y (February 2001). "Glycyrrhizin increases survival of mice with herpes simplex encephalitis.". Acta Virologica. 45 (1): 51–4. PMID 11394578. 
  12. ^ Michaelis, Martin; Geiler, Janina; Naczk, Patrizia; Sithisarn, Patchima; Leutz, Anke; Doerr, Hans Wilhelm; Cinatl, Jindrich (2011). Pekosz, Andrew, ed. "Glycyrrhizin Exerts Antioxidative Effects in H5N1 Influenza a Virus-Infected Cells and Inhibits Virus Replication and Pro-Inflammatory Gene Expression". PLoS ONE. 6 (5): e19705. PMC 3096629Freely accessible. PMID 21611183. doi:10.1371/journal.pone.0019705. 
  13. ^ Baba, M; Shigeta, S (February 1987). "Antiviral activity of glycyrrhizin against varicella-zoster virus in vitro.". Antiviral Research. 7 (2): 99–107. PMID 3034150. doi:10.1016/0166-3542(87)90025-8. 
  14. ^ a b Kočevar Glavač, Nina; Kreft, Samo (2012). "Excretion profile of glycyrrhizin metabolite in human urine". Food Chemistry. 131: 305–308. doi:10.1016/j.foodchem.2011.08.081. 
  15. ^ "Glycyrrhizic Acid". PubChem. National Institutes of Health. Retrieved 24 February 2014. 

External links[edit]