Licorice root has a long history of use for soothing inflamed and injured mucous membranes in the digestive tract. Licorice may protect the stomach and duodenum by increasing production of mucin, a substance that protects the lining of these organs against stomach acid and other harmful substances.¹ According to laboratory research, flavonoids in licorice may also inhibit growth of H. pylori.²

Chamomile has a soothing effect on inflamed and irritated mucous membranes. It is also high in the flavonoid apigenin—another flavonoid that has inhibited growth of H. pylori in test tubes.² Many doctors recommend drinking two to three cups of strong chamomile tea each day. The tea can be made by combining 3 to 5 ml of chamomile tincture with hot water or by steeping 2 to 3 tsp of chamomile flowers in the water, covered, for 10 to 15 minutes. Chamomile is also available in capsules; two may be taken three times per day.

The gummy extract of Pistachia lentiscus, also known as mastic or gum mastic, has been shown in one preliminary study and one double-blind study to heal peptic ulcers.^3,4 This may be related to its ability to kill H. pylori in test tubes.⁵

Administration of 30 to 60 mg of freeze-dried neem bark extract twice per day led to a significant reduction in stomach acid levels and near complete healing of all people with duodenal ulcers over ten weeks time in a preliminary clinical trial.⁸

Chamomile has a soothing effect on inflamed and irritated mucous membranes. It is also high in the flavonoid apigenin—another flavonoid that has inhibited growth of H. pylori in test tubes.⁹ Many doctors recommend drinking two to three cups of strong chamomile tea each day. The tea can be made by combining 3 to 5 ml of chamomile tincture with hot water or by steeping 2 to 3 tsp of chamomile flowers in the water, covered, for 10 to 15 minutes. Chamomile is also available in capsules; two may be taken three times per day.

Vitamin A is needed to heal the linings (called mucous membranes) of the stomach and intestines. In one controlled trial, vitamin A supplementation facilitated healing in a small group of people with stomach ulcer.¹⁰ The amount used in that study (150,000 IU per day) can be toxic and may also cause birth defects. Such a high dose should not be taken by a pregnant woman, by a woman who could become pregnant, or by anyone else without careful supervision from a doctor. Objective evidence of ulcer healing from taking vitamin A has been reported by the same research group.¹¹ The effect of lower amounts of vitamin A has not been studied in people with peptic ulcer.

Zinc is also needed for the repair of damaged tissue and has protected against stomach ulceration in animal studies.¹² In Europe, zinc combined with acexamic acid, an anti-inflammatory substance, is used as a drug in the treatment of peptic ulcers.¹³ In a small controlled trial, high amounts of zinc accelerated the healing of gastric ulcers compared with placebo.¹⁴ Some doctors suspect that such an exceptionally high intake of zinc may be unnecessary, suggesting instead that people with ulcers wishing to take zinc supplements use only 25 to 50 mg of zinc per day. Even at these lower levels, 1 to 3 mg of copper per day must be taken to avoid copper deficiency that would otherwise be induced by the zinc supplementation.

Experimental animal studies have shown that a zinc salt of the amino acid carnosine exerts significant protection against ulcer formation and promotes the healing of existing ulcers.^15,16 However, because zinc by itself has been shown to be helpful against peptic ulcer, it is not known how much of the beneficial effect was due to the carnosine.^17,18 Clinical studies in humans demonstrated that this compound can help eradicate H. pylori, an organism that has been linked to peptic ulcer and stomach cancer.¹⁹ The amount of the zinc carnosine complex used in research studies for eradication of H. pylori is 150 mg twice daily.

Calendula is another plant with anti-inflammatory and healing activities that can be used as part of a traditional medicine approach to peptic ulcers. The same amount as chamomile can be used.

Experimental animal studies have shown that a zinc salt of the amino acid carnosine exerts significant protection against ulcer formation and promotes the healing of existing ulcers.^20,21 However, because zinc by itself has been shown to be helpful against peptic ulcer, it is not known how much of the beneficial effect was due to the carnosine.^22,23 Clinical studies in humans demonstrated that this compound can help eradicate H. pylori, an organism that has been linked to peptic ulcer and stomach cancer.²⁴ The amount of the zinc carnosine complex used in research studies for eradication of H. pylori is 150 mg twice daily.

Chamomile has a soothing effect on inflamed and irritated mucous membranes. It is also high in the flavonoid apigenin—another flavonoid that has inhibited growth of H. pylori in test tubes.²⁵ Many doctors recommend drinking two to three cups of strong chamomile tea each day. The tea can be made by combining 3 to 5 ml of chamomile tincture with hot water or by steeping 2 to 3 tsp of chamomile flowers in the water, covered, for 10 to 15 minutes. Chamomile is also available in capsules; two may be taken three times per day.

Comfrey has a long tradition of use as a topical agent for improving healing of wounds and skin ulcers.^26,27 It is also used for people with gastrointestinal problems, including stomach ulcers, though these traditional uses have yet to be tested in scientific studies. People should only use comfrey preparations made from the leaves and avoid those made from the root.

Extracts of the herb corydalis are not only helpful as pain-relief agents but also may be useful in the treatment of stomach ulcers. In a study of people with stomach and intestinal ulcers or chronic inflammation of the stomach lining, 90 to 120 mg of corydalis extract per day (equal to 5 to 10 grams of the crude herb) was found to be effective in 76% of the participants.²⁸

Oral supplementation with dimethyl sulfoxide (DMSO) reduced relapse rates for peptic ulcer significantly better than did placebo or the ulcer drug cimetidine (Tagamet) in one study.²⁹ Previous research showed that DMSO in combination with cimetidine was more effective than cimetidine alone.³⁰ These trials used 500 mg of DMSO taken four times per day. The authors of these trials believe the antioxidant activity of DMSO may have a protective effect. Oral supplementation with DMSO should not be attempted without the supervision of a doctor.

Garlic has been reported to have anti-Helicobacter activity in test-tube studies.^31,32 In a preliminary trial, garlic supplementation (300 mg in tablets three times daily for eight weeks) failed to eradicate H. pylori in participants with active infections.³³ In another preliminary trial, participants with active H. pylori infections added 10 sliced cloves of garlic to a meal.³⁴ The addition of garlic failed to inhibit the growth of the organism. Further trials using garlic extracts are needed to validate the anti-Helicobacter activity of garlic observed in test tubes. Until then, evidence to support the use of garlic for H. pylori-related peptic ulcers remains weak.

Glutamine, an amino acid, is the principal source of energy for cells that line the small intestine and stomach. More than 40 years ago, glutamine was reported to help people with peptic ulcer in a preliminary trial.³⁵ Glutamine has also prevented stress ulcers triggered by severe burns in another preliminary study.³⁶ Despite the limited amount of published research, some doctors suggest 500 to 1,000 mg of glutamine taken two to three times per day to help people overcome peptic ulcers.

Marshmallow is high in mucilage. High-mucilage-containing herbs have a long history of use for irritated or inflamed mucous membranes in the digestive system, though no clinical research has yet investigated effects in people with peptic ulcer.³⁷

Because of the anti-inflammatory and healing effects of plantain, it may be beneficial in some people with peptic ulcer. Clinical trials have not been done to confirm this possibility.

Little is known about the effects of vitamin C supplementation for people with peptic ulcer. People with gastritis, a related condition, have been found to have low levels of vitamin C in their stomach juice. Vitamin C may also help eradicate H. pylori in people with gastritis. Vitamin C may one day prove to have a therapeutic effect for people with peptic ulcer; however, further research in this area is needed.⁴⁰