Carminatives (also called aromatic digestive tonics or aromatic bitters) may be used to relieve symptoms of indigestion, particularly when there is excessive gas. It is believed that carminative agents work, at least in part, by relieving spasms in the intestinal tract.¹¹

Among the most notable and well-studied carminatives are peppermint, fennel, and caraway. Double-blind trials have shown that combinations of peppermint and caraway oil and a combination of peppermint, fennel, caraway, and wormwood have been found to reduce gas and cramping in people with indigestion.^12,13,14 Generally, 3–5 drops of natural essential oils or 3–5 ml of tincture of any of these herbs, taken in water two to three times per day before meals, can be helpful. Alternately, a tea can be made by grinding 2–3 teaspoons of the seeds of fennel or caraway or the leaves of peppermint, and then simmering them in a cup of water (covered) for ten minutes. Drink three or more cups per day just after meals.

In the intestinal tract, peppermint oil reduces gas production, eases intestinal cramping, and soothes irritation.¹⁵ Peppermint oil has been reported to help relieve symptoms of IBS in two analyses of controlled trials.^16,17 Evidence supporting the use of peppermint oil has come from double-blind trials that typically have used enteric-coated capsules that supply 0.2–0.4 ml of peppermint oil taken two to three times per day.^{18,19,20,21,22} Some trials have found peppermint oil ineffective.^23,24 However, a pooled analysis (meta-analysis) of 9 randomized controlled trials (with a total of 726 patients) found that enteric-coated peppermint oil capsules are a safe and effective treatment for IBS.²⁵

The combination of 90 mg of peppermint oil plus 50 mg of caraway oil in enteric-coated capsules taken three times per day led to significant reduction in IBS symptoms in a double-blind trial.²⁶ In a similar trial, capsules that were not enteric-coated were as effective as enteric-coated capsules.²⁷ The same combination has compared favorably to the drug cisapride (Propulsid) in reducing symptoms of IBS.²⁸ The purpose of enteric coating is to protect peppermint oil while it is passing through the acid environment of the stomach.

Whole peppermint leaf is often used either alone or in combination with other herbs to treat abdominal discomfort and mild cramping that accompany IBS. The combination of peppermint, caraway seeds, fennel seeds, and wormwood was reported to be an effective treatment for upper abdominal complaints in a double-blind trial.²⁹

Whole peppermint leaf is often used either alone or in combination with other herbs to treat abdominal discomfort and mild cramping that accompany IBS. The combination of peppermint, caraway seeds, fennel seeds, and wormwood was reported to be an effective treatment for upper abdominal complaints in a double-blind trial.³⁰

According to preliminary research, a mixture of essential oils dissolved some gallstones when taken for several months.³¹ The greatest benefits occurred when the oils were combined with chenodeoxycholic acid, which is available by prescription.³² However, only about 10% of people with gallstones have shown significant dissolution as a result of taking essential oils. Peppermint oil is the closest available product to that used in the research described above. Use of peppermint or any other essential oil to dissolve gallstones should only be attempted with the close supervision of a doctor.

A preliminary report suggested that peppermint oil has relaxing and pain relieving effects, and may be useful as a topical remedy for tension-type headache.³³ In a double-blind study, spreading a 10% peppermint oil solution across the temples three times over a 30-minute period was significantly better than placebo and as effective as acetaminophen in reducing headache pain.³⁴ Similar use of an ointment combining menthol and other oils related to peppermint oil was also as effective as pain relieving medication and superior to placebo in another double-blind study.³⁵

A combination of eucalyptus and peppermint oil applied directly to a painful area may help. Preliminary research indicates that the counter-irritant quality of these essential oils may decrease pain and increase blood flow to afflicted regions.³⁶ Peppermint and eucalyptus, diluted in an oil base, are usually applied several times per day, or as needed, to control pain. Plant oils that may have similar properties are rosemary, juniper, and wintergreen.

A mouthwash combination that includes sage oil, peppermint oil, menthol, chamomile tincture, expressed juice from echinacea, myrrh tincture, clove oil, and caraway oil has been used successfully to treat gingivitis.³⁷ In cases of acute gum inflammation, 0.5 ml of the herbal mixture in half a glass of water three times daily is recommended by some herbalists. This herbal preparation should be swished slowly in the mouth before spitting out. To prevent recurrences, slightly less of the mixture can be used less frequently.

A toothpaste containing sage oil, peppermint oil, chamomile tincture, expressed juice from Echinacea purpurea, myrrh tincture, and rhatany tincture has been used to accompany this mouthwash in managing gingivitis.³⁸

Of the many herbs listed above, chamomile, echinacea, and myrrh should be priorities. These three herbs can provide anti-inflammatory and antimicrobial actions critical to successfully treating gingivitis.

The potent effects of some commercial mouthwashes may be due to the inclusion of thymol (from thyme) and eukalyptol (from eucalyptus)—volatile oils that have proven activity against bacteria. One report showed bacterial counts plummet in as little as 30 seconds following a mouthrinse with the commercial mouthwash Listerine™, which contains thymol and eukalyptol.³⁹ Thymol alone has been shown in research to inhibit the growth of bacteria found in the mouth.^40,41 Because of their antibacterial properties, other volatile oils made from tea tree,⁴² clove, caraway, peppermint, and sage,⁴³ as well as the herbs myrrh⁴⁴ and bloodroot,⁴⁵ might be considered in a mouthwash or toothpaste. Due to potential allergic reactions and potential side effects if some of these oils are swallowed, it is best to consult with a qualified healthcare professional before pursuing self-treatment with volatile oils that are not in approved over-the-counter products for halitosis.

Volatile oils from oregano, thyme, peppermint, tea tree, and rosemary have all demonstrated antifungal action in test tube studies.⁴⁶ A recent study compared the anti-Candida effect of oregano oil to that of caprylic acid.⁴⁷ The results indicated that oregano oil is over 100 times more potent than caprylic acid, against Candida. Since the volatile oils are quickly absorbed and associated with inducing heartburn, they must be taken in coated capsules, so they do not break down in the stomach but instead are delivered to the small and large intestine. This process is known as “enteric coating.” Some doctors recommend using 0.2 to 0.4 ml of enteric-coated peppermint and/or oregano oil supplements three times per day 20 minutes before meals. However, none of these volatile oils has been studied for their anti-Candida effect in humans.

Several gas-relieving herbs used in traditional medicine for colic are approved in Germany for intestinal spasms.⁴⁸ These include yarrow, garden angelica (Angelica archangelica),peppermint, cinnamon, and fumitory (Fumaria officinalis). These herbs are generally given by healthcare professionals as teas or decoctions to the infant. Peppermint tea should be used with caution in infants and young children, as they may choke in reaction to the strong menthol.

Eucalyptus oil is often used in a steam inhalation to help clear nasal and sinus congestion. It is said to work similarly to menthol, by acting on receptors in the nasal mucous membranes, leading to a reduction of nasal stuffiness.⁴⁹Peppermint may have a similar action and is a source of small amounts of menthol.

A combination of eucalyptus and peppermint oil applied directly to a painful area may help. Preliminary research indicates that the counter-irritant quality of these essential oils may decrease pain and increase blood flow to afflicted regions.⁵⁰ Peppermint and eucalyptus, diluted in an oil base, are usually applied several times per day, or as needed, to control pain. Plant oils that may have similar properties are rosemary, juniper, and wintergreen.

Volatile oils from oregano, thyme, peppermint, tea tree, and rosemary have all demonstrated antifungal action in test tube studies.⁵¹ A recent study compared the anti-Candida effect of oregano oil to that of caprylic acid.⁵² The results indicated that oregano oil is over 100 times more potent than caprylic acid, against Candida. Since the volatile oils are quickly absorbed and associated with inducing heartburn, they must be taken in coated capsules, so they do not break down in the stomach but instead are delivered to the small and large intestine. This process is known as “enteric coating.” Some doctors recommend using 0.2 to 0.4 ml of enteric-coated peppermint and/or oregano oil supplements three times per day 20 minutes before meals. However, none of these volatile oils has been studied for their anti-Candida effect in humans.

Cooling essential oils, such as peppermint and menthol, have been used topically to relieve burning pain and itch. Such oils should not be applied full-strength, but should rather be diluted (for example in lotion or gel) to avoid further skin irritation.



A great many plants have been used historically to treat skin inflammations like poison oak and poison ivy dermatitis. Examples include calendula (Calendula officinalis), blood root (Sanguinaria canadensis), Virginia snakeroot (Aristolachia serpentaria), holy basil (Ocimum tenuifolium), and chickweed (Stellaria media). None of these remedies has been subjected to controlled clinical studies to determine if they are safe and effective for this use.