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Questions About Natural Products

Licorice and Male Potency


My husband is type O and when he takes Glycyrrhiza glabra, he feels that his sexual ability (potency) reduces. Is there by any chance a connection between licorice and sexual ability?


Large doses of licorice have been known to cause breast tenderness in men (I remember in school clinic a case of a man with rather large breast enlargement due to drinking over 1 gallon of strong licorice tea over a period of 2 years.)

Licorice has been shown to lower testosterone (1), and to bind with estrogen receptors (2). In rational amounts and in non-sensitive individuals this is probably not much of an issue; however people do vary significantly in their sensitivity to licorice and prudence should be used with taking licorice or any other herbal supplement.

You husband may want to switch over to using DGL licorice, as this form still possesses many of licorices' benficial properties while elininating the potential for its more serious side effects, such as edema (swelling) and high blood pressure.

1. Armanini D, Bonanni G, Palermo M. Reduction of serum testosterone in men by licorice. N Engl J Med. 1999 Oct 7;341(15):1158

2. Zava DT, Dollbaum CM, Blen M. Estrogen and progestin bioactivity of foods, herbs, and spices. Proc Soc Exp Biol Med 1998 Mar;217(3):369-78

The Ask Dr. D'Adamo internet advice column ran from 1996 to 2009, at which time Dr. D'Adamo's teaching and programming responsibilities no longer allowed him to devote time and resources to directly answering visitor questions. However we've recently reorganized this treasure-trove of material and made it again available to his readership. He occasionally posts new entries. These are marked with a NEW tag.

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Quercetin capsules were developed by Dr. Peter J. D'Adamo, author of Eat Right 4 Your Type to give your body the antioxidant support it needs for healthy function.Quercetin has been used for decades to help support a healthy cardiovascular and immune system. Research also supports the findings that Quercetin may support a healthy response to occasional inflammation following sports activity and provide relief from seasonal symptoms.

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