Skip to main content
Supplement ScienceSupplementScience
DGL Licorice supplement
Herbal Gastroprotectant

DGL Licorice — Research Profile

Evidence:Moderate
·

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

DGL licorice is a safe form of licorice with glycyrrhizin removed to prevent blood pressure side effects.

DGL licorice is a safe form of licorice with glycyrrhizin removed to prevent blood pressure side effects. It protects the stomach lining by stimulating mucus production and enhancing mucosal blood flow. Chew 380-760mg DGL tablets 20 minutes before meals for heartburn, gastritis, or ulcer support.

Key Facts

What it is
Licorice root extract with glycyrrhizin removed, retaining gastroprotective flavonoids and saponins
Primary benefits
  • Stimulates gastric mucus production
  • Enhances mucosal blood flow
  • Supports healing of gastric and duodenal ulcers
  • Soothes heartburn and GERD symptoms
Typical dosage
380-760mg chewable tablets 20 minutes before meals
Evidence level
Moderate
Safety profile
Generally Safe

Get the free evidence-based DGL Licorice guide — delivered in 60 seconds.

No spam. Unsubscribe anytime.

What the Research Says

DGL has moderate clinical evidence for gastroprotection and ulcer support. The Morgan et al. (1985) comparison with cimetidine remains an important study showing DGL can maintain ulcer healing. The GutGard standardized extract has more recent clinical evidence for dyspepsia. DGL works by enhancing the stomach's natural defenses (mucus, blood flow, prostaglandins) rather than suppressing acid, making it complementary to acid-reducing medications. It is one of the most widely recommended natural gastroprotectants in integrative medicine.

Benefits of DGL Licorice

  • Gastric mucosal protection — DGL stimulates mucin secretion and prostaglandin E2 production, which protect the gastric epithelium from acid damage (van Marle et al., 1981)
  • Ulcer healing — Morgan et al. (1985, n=100) found DGL was as effective as cimetidine (an H2 blocker) for maintaining healed duodenal ulcers over 2 years of follow-up
  • H. pylori activity — a standardized licorice extract (GutGard) showed anti-H. pylori activity and reduced dyspepsia symptoms in an RCT (Raveendra et al., 2012, n=120)
  • GERD symptom relief — DGL increases mucosal resistance to acid, providing symptomatic relief for reflux without suppressing acid production
Did you know?

DGL has moderate clinical evidence for gastroprotection and ulcer support.

Forms of DGL Licorice

DGL Licorice supplement forms compared by bioavailability and best use
FormBioavailabilityBest For
DGL Chewable TabletsHigh (oral mucosa + GI)Standard form — chewing activates salivary factors that enhance efficacy; must be chewed, not swallowed
DGL CapsulesModerateConvenience — for those who prefer capsules, though chewable form is traditionally considered superior
GutGard (standardized extract)HighStandardized to glabridin content — most clinically studied DGL form

Dosage Recommendations

General recommendation: 380-760mg DGL chewable tablets, 20 minutes before meals, 3x daily

Timing: 20 minutes before meals; must be chewed for optimal effect

Dosage by Condition

GERD/heartburn
380-760mg chewable before mealsModerate
Gastric/duodenal ulcer support
760mg 3x daily before mealsModerate
Functional dyspepsia
75-150mg GutGard twice dailyModerate

Upper limit: 2,280mg DGL per day (760mg 3x daily)

Side Effects and Safety

Safety profile: Generally Safe

Potential Side Effects

  • Very well tolerated — glycyrrhizin removal eliminates the main licorice safety concerns
  • Mild nausea in some individuals
  • Extremely rare allergic reactions

Drug & Supplement Interactions

  • Regular licorice/glycyrrhizin-containing products — do not combine; DGL is safe but regular licorice causes hypertension
  • Warfarin — licorice flavonoids may have mild antiplatelet activity
  • Generally very few drug interactions due to glycyrrhizin removal
Check DGL Licorice interactions with other supplements →
BenefitsDosage GuideSide EffectsTypes & FormsResearchFAQ

Related Conditions

Commonly Taken Together

Related Guides

Related Supplements

Frequently Asked Questions

What is the difference between DGL and regular licorice?

Regular licorice contains glycyrrhizin, which inhibits cortisol metabolism and causes pseudo-aldosteronism (hypertension, fluid retention, low potassium). DGL has glycyrrhizin removed, eliminating these risks while retaining the gastroprotective compounds. Always use DGL for medicinal purposes, especially long-term.

Why do DGL tablets need to be chewed?

Traditional teaching holds that chewing DGL tablets mixes them with saliva, which contains epidermal growth factor (EGF) that synergizes with DGL for mucosal repair. While this mechanism is debated, clinical studies typically used chewable forms. Swallowing DGL capsules may still provide benefit but chewable is the traditional recommendation.

Can I take DGL with a PPI?

Yes. DGL works by a completely different mechanism than PPIs. PPIs reduce acid production; DGL enhances mucosal defense. They are complementary, not conflicting. DGL may provide additional symptom relief and mucosal support while taking a PPI, and may support PPI tapering when appropriate under medical guidance.

What is the best form of DGL Licorice to take?

The best form of dgl licorice depends on your specific health goals, absorption needs, and tolerance. Chelated and standardized extract forms generally offer higher bioavailability than raw or unstandardized versions. Check the product label for third-party testing to ensure potency and purity.

What are the proven benefits of DGL Licorice?

DGL Licorice has been studied for multiple health applications with varying levels of clinical evidence. The strongest evidence typically comes from randomized controlled trials and meta-analyses published in peer-reviewed journals. Individual responses can vary based on baseline status, dosage, and duration of use.

How much DGL Licorice should I take per day?

DGL Licorice dosage depends on the specific form, your health goals, and individual factors such as body weight and baseline nutrient status. Following the dose used in clinical trials is generally the most evidence-based approach. Starting at the lower end of the recommended range and adjusting upward is advisable.

When is the best time to take DGL Licorice?

DGL Licorice timing depends on whether it is fat-soluble or water-soluble and whether it causes digestive sensitivity. Consistency in timing is more important than the specific hour of the day. Taking supplements at the same time daily helps maintain steady levels.

What are the side effects of DGL Licorice?

DGL Licorice is generally well tolerated at recommended doses, with gastrointestinal discomfort being the most commonly reported side effect. Side effects are typically mild and dose-dependent, resolving with dose reduction or taking with food. Serious adverse effects are rare at standard supplemental doses.

Does DGL Licorice interact with any medications?

DGL Licorice may interact with certain prescription medications by affecting absorption, metabolism, or pharmacological effects. Always inform your healthcare provider about all supplements you take, especially before surgery or when starting new medications. Spacing supplements and medications by 2 hours reduces most absorption interactions.

Who should consider taking DGL Licorice?

DGL Licorice is most appropriate for individuals with confirmed deficiency, suboptimal levels, or specific health conditions supported by clinical evidence. People in higher-risk demographics, including older adults and those with restricted diets, may benefit most. Testing baseline levels before supplementing provides the best guidance.

How long does DGL Licorice take to show results?

DGL Licorice effects vary by the specific health outcome being targeted, with some benefits appearing within days and others requiring weeks to months of consistent daily use. Correcting a deficiency typically shows improvement within 2-4 weeks. A minimum 8-12 week trial at the recommended dose is advisable before evaluating effectiveness.

Is DGL Licorice safe for long-term daily use?

DGL Licorice is considered safe for long-term use at recommended doses based on available clinical data. Staying within established upper intake limits minimizes the risk of adverse effects over time. Periodic reassessment with a healthcare provider is recommended, especially if health conditions change.

Can you take too much DGL Licorice?

Exceeding the recommended dose of dgl licorice increases the risk of adverse effects without providing additional benefit. Toxicity risk varies by form and individual factors such as kidney and liver function. Mega-dosing is not supported by clinical evidence and should be avoided.

Can I combine DGL Licorice with other supplements?

DGL Licorice can generally be combined with complementary supplements, though some combinations may affect absorption or create additive effects. Spacing different supplements by 1-2 hours can reduce absorption competition. Consulting a healthcare professional is advisable when combining multiple supplements targeting the same health pathway.

What should I look for when buying a DGL Licorice supplement?

Third-party testing from USP, NSF, or ConsumerLab is the most important quality indicator when purchasing dgl licorice supplements. Look for products that clearly state the specific form, dose per serving, and any relevant standardization percentages. Avoid proprietary blends that hide individual ingredient amounts.

Continue Reading

References

  1. Morgan AG, McAdam WA, Pacsoo C, et al. (1985). Comparison between cimetidine and Caved-S in the treatment of gastric ulceration, and subsequent maintenance therapy. Gut. DOI PubMed
  2. Raveendra KR, Jayachandra, Srinivasa V, et al. (2012). An extract of Glycyrrhiza glabra (GutGard) alleviates symptoms of functional dyspepsia: a randomized, double-blind, placebo-controlled study. Evidence-Based Complementary and Alternative Medicine. DOI PubMed