Glycyrrhetinic Acid

Introduction to Glycyrrhetinic Acid Glycyrrhetinic acid is the hidden powerhouse behind one of the world's oldest traditional medicines: licorice root (Glycyrrhiza glabra). While most people associate licorice with the distinctively flavored black candy, true licorice root has been utilized for millennia across Assyrian, Egyptian, Greek, Chinese, and Indian cultures to treat respiratory ailments, digestive distress, and fatigue.

When you consume licorice, you are ingesting a compound called glycyrrhizin. Once it reaches your gut, your microbiome strips away its sugar molecules to release glycyrrhetinic acid (also known as enoxolone). This active aglycone is responsible for the profound pharmacological effects of licorice—both its impressive healing benefits and its potentially dangerous side effects.

The Biochemistry: How Glycyrrhetinic Acid Works To understand why glycyrrhetinic acid is both revered and cautioned against, you have to look at its interaction with the body's stress hormone, cortisol.

The Cortisol Connection and 11β-HSD2 Inhibition In a healthy body, cortisol is released by the adrenal glands to manage stress, reduce inflammation, and mobilize energy. However, cortisol is a powerful hormone that can wreak havoc if left unchecked. In tissues like the kidneys, an enzyme called 11-beta-hydroxysteroid dehydrogenase type 2 (11β-HSD2) acts as a bouncer, converting active cortisol into inactive cortisone. This prevents cortisol from binding to mineralocorticoid receptors, which are supposed to be reserved for aldosterone (a hormone that regulates sodium and water balance).

Glycyrrhetinic acid is a potent, competitive inhibitor of 11β-HSD2. By blocking this enzyme, glycyrrhetinic acid allows cortisol to remain active much longer than normal. For someone suffering from chronic fatigue or "adrenal burnout," this prolonged cortisol half-life can provide a noticeable boost in sustained energy and stress resilience.

The Danger of Pseudohyperaldosteronism However, this mechanism is a double-edged sword. When 11β-HSD2 is inhibited in the kidneys, the flood of active cortisol binds to the mineralocorticoid receptors. The kidneys are tricked into thinking there is a massive surge of aldosterone. In response, they aggressively hold onto sodium and water while excreting potassium. This condition, known as pseudohyperaldosteronism, leads to fluid retention, severe spikes in blood pressure, and potentially dangerous drops in potassium levels (hypokalemia) that can trigger cardiac arrhythmias.

Primary Benefits and Clinical Applications

Gut Health, Ulcers, and Gastritis Licorice is arguably most famous for its gastrointestinal benefits. Glycyrrhetinic acid exerts direct anti-inflammatory effects on the gastric mucosa by inhibiting the production of pro-inflammatory prostaglandins and leukotrienes. This helps soothe the stomach lining and accelerates the healing of peptic ulcers and gastritis. Because of the blood pressure risks associated with whole licorice, a specialized form called Deglycyrrhizinated Licorice (DGL)—which has the glycyrrhizin removed—is the clinical standard for gut health.

Topical Skin Healing and Eczema Because glycyrrhetinic acid acts similarly to hydrocortisone (by keeping local cortisol active), it is highly effective when applied topically. Clinical studies show that applying a 2% glycyrrhetinic acid gel three times daily for two weeks significantly reduces the redness, swelling, and itching associated with atopic dermatitis (eczema). It is also used in cosmetic formulations to soothe irritated skin and promote burn healing.

Oral Health and Canker Sores Licorice extracts are highly effective for oral mucosal health. Using a licorice mouth rinse or applying a topical patch has been shown to reduce the size and pain of recurrent aphthous stomatitis (canker sores). Additionally, gargling with a licorice fluid before surgery has been clinically proven to reduce the incidence of sore throat and coughing after a breathing tube is removed.

DGL: The Safer Alternative for Long-Term Use Because the side effects of glycyrrhetinic acid are so severe when taken chronically, the supplement industry developed Deglycyrrhizinated Licorice (DGL). DGL is licorice root extract that has been chemically processed to remove glycyrrhizin to below detectable levels.

If you are taking licorice for gut health, acid reflux, or ulcers, DGL is the mandatory choice. It provides the soothing, mucilage-like benefits to the digestive tract without inhibiting 11β-HSD2, meaning it will not raise your blood pressure or deplete your potassium. DGL is considered safe for daily use for up to 4 months at doses up to 4.5 grams.

Dosage Guidelines and Safety Warnings If you are using whole licorice root or pure glycyrrhetinic acid for adrenal support, extreme caution is required.

Standard Licorice Root: Traditional doses range from 1 to 15 grams daily. However, consuming 5 grams or more daily for several weeks is strongly linked to severe cardiovascular side effects. Pure Glycyrrhetinic Acid: Found in some specialized adrenal supplements (often around 200mg). This should be cycled strictly and never used by individuals with pre-existing hypertension. DGL (Deglycyrrhizinated Licorice): Safe at doses up to 4.5 grams daily.

Critical Contraindications: You must absolutely avoid whole licorice and glycyrrhetinic acid if you have high blood pressure, heart disease, or kidney disease. Pregnant women must also avoid large amounts of licorice, as it has been linked to an increased risk of premature delivery.

Conclusion Glycyrrhetinic acid is a fascinating compound that bridges the gap between herbalism and endocrinology. By manipulating the body's cortisol metabolism, it offers unique benefits for energy, inflammation, and skin health. However, it demands deep respect. Unless you are specifically looking for short-term adrenal modulation and are monitoring your blood pressure, DGL remains the safest and most effective way to harness the benefits of the licorice plant.