Evidence-graded guideReviewed October 31, 2026

Herbs for Digestion and Bloating: 10 Backed by Trials, Ranked

The herbs with the best evidence for digestion and bloating are enteric-coated peppermint oil, ginger and fennel, with artichoke leaf extract and a caraway-peppermint combination close behind. Peppermint oil is the only one with repeated randomised trials and meta-analyses behind it: in people with irritable bowel syndrome, 180 to 225 mg of enteric-coated oil two to three times a day roughly doubles the odds of overall symptom relief compared with placebo, and bloating is one of the symptoms that improves most. Ginger has the strongest evidence for nausea and slow stomach emptying, and fennel and caraway have smaller trials for gas and cramping.

This guide is for people with functional bloating, gas, fullness after meals or mild IBS-type symptoms that come and go. It is not for red-flag symptoms. If bloating is new and persistent after age 50, comes with unintentional weight loss, blood in the stool, vomiting, fever, difficulty swallowing, a family history of bowel or ovarian cancer, or anaemia, see a doctor before trying anything here. Persistent bloating in women in particular should be checked, because ovarian cancer and coeliac disease both present this way.

Below, each pick is graded by the quality of human evidence for this specific use, with the studied dose, who it suits, and what can go wrong. Most digestive herbs are Moderate or Preliminary. A short list of popular things that do not hold up follows, then a section on the non-herb levers (fibre type, meal size, FODMAPs, movement) that often matter more than any capsule.

Quick answer

  • Enteric-coated peppermint oil — roughly doubles the odds of IBS symptom relief in meta-analyses of 12+ RCTs; best data for bloating and cramp
  • Ginger — speeds gastric emptying and reduces nausea and fullness in several RCTs at 1–1.5 g/day
  • Artichoke leaf extract — reduces dyspepsia and bloating scores in two RCTs at 320–640 mg/day
  • Fennel and caraway — carminative seeds with small trials for gas, cramping and infant colic
  • Psyllium — the fibre that helps both IBS-constipation and loose stools without worsening gas the way bran does
  • Probiotics (Lactobacillus/Bifidobacterium strains) — modest, strain-specific reductions in bloating over 4–8 weeks

The 10 best herbs and supplements for digestion and bloating

Ranked by the strength of human evidence. Strong = multiple trials or a meta-analysis. Moderate = a few small trials. Preliminary = early or animal data.

  1. Peppermint oil (enteric-coated)

    Strong evidenceMentha piperita

    Peppermint oil is the most studied herb for gut symptoms. A 2019 meta-analysis of 12 RCTs (835 patients) found it improved global IBS symptoms with a risk ratio of about 2.4 versus placebo, and a 2014 meta-analysis found a number needed to treat of around 3. Bloating, abdominal pain and gas respond best; the menthol relaxes intestinal smooth muscle via calcium-channel blockade. It only works reliably in enteric-coated capsules, which release in the small intestine instead of the stomach.

    Key evidence
    2019 meta-analysis of 12 RCTs, 835 patients (Alammar et al., BMC Complementary Medicine)
    Studied dose
    180–225 mg enteric-coated peppermint oil, 2–3 times daily before meals, for 2–12 weeks
    Best for
    IBS-type bloating, cramping and gas; the first thing to try
    Cautions
    Can worsen reflux and heartburn, especially in non-coated forms; avoid with hiatal hernia or severe GERD. May raise cyclosporine levels, and the capsules should not be taken with antacids or PPIs at the same time because the coating dissolves early.
    Full Peppermint oil (enteric-coated) profile

  2. Ginger

    Moderate evidenceZingiber officinale

    Ginger accelerates gastric emptying: in a crossover RCT in healthy volunteers, 1.2 g of ginger powder cut the half-emptying time from 16.1 to 12.3 minutes and increased antral contractions. In functional dyspepsia, 1.2 g before meals sped emptying but did not change symptoms in one small trial, while a 2020 RCT combining ginger with artichoke reduced fullness and bloating. Ginger's best evidence is for nausea, where a meta-analysis of 12 RCTs confirmed benefit at 1–1.5 g/day for pregnancy and chemotherapy nausea.

    Key evidence
    Crossover RCT on gastric emptying (Wu et al., 2008) plus 2020 ginger-artichoke RCT in functional dyspepsia
    Studied dose
    1–1.5 g/day of dried ginger root powder or a standardised extract, split before meals
    Best for
    Fullness after meals, nausea, slow stomach emptying
    Cautions
    Mild antiplatelet effect; use caution with warfarin, clopidogrel and before surgery. Can cause heartburn at doses above 2 g. Generally considered safe in pregnancy up to 1 g/day for nausea.
    Full Ginger profile

  3. Artichoke leaf extract

    Moderate evidenceCynara cardunculus var. scolymus

    Artichoke leaf stimulates bile flow (choleresis), which helps fat digestion and fullness. A six-week RCT of 247 people with functional dyspepsia found 640 mg/day of extract reduced overall symptom scores significantly more than placebo and improved quality of life. An earlier open trial of 553 patients reported reduced bloating, nausea and abdominal pain within six weeks, and a 2020 RCT of a ginger-artichoke combination reduced dyspepsia symptoms by about 50 percent on a validated scale.

    Key evidence
    2003 RCT of 247 patients with functional dyspepsia (Holtmann et al.)
    Studied dose
    320–640 mg/day of a standardised leaf extract (often 2.5–5% cynarin), taken with meals for 6 weeks
    Best for
    Fatty-meal fullness, sluggish digestion, mild dyspepsia
    Cautions
    Avoid with gallstones or bile duct obstruction because it stimulates bile flow. Possible allergy in people sensitive to the daisy (Asteraceae) family. No well-documented drug interactions.
    Full Artichoke leaf extract profile

  4. Caraway (with peppermint)

    Moderate evidenceCarum carvi

    Caraway is a classic carminative and is best studied in a fixed combination with peppermint oil (90 mg peppermint + 50 mg caraway oil). A four-week RCT of 223 patients with functional dyspepsia found the combination reduced pain intensity by about 40 percent and sensation of pressure and fullness significantly more than placebo, and a separate trial found it comparable to the prokinetic drug cisapride. On its own, caraway oil applied as a warm abdominal compress reduced IBS symptoms in a small 2015 trial.

    Key evidence
    2000 RCT of 223 patients on peppermint-caraway oil (May et al.)
    Studied dose
    50 mg caraway oil + 90 mg peppermint oil in enteric-coated capsules, 1 capsule 2–3 times daily, or 1–2 g crushed seed as tea
    Best for
    Pressure, fullness and gas after meals; pairs with peppermint
    Cautions
    Avoid in pregnancy at medicinal doses. May lower blood sugar modestly, so monitor with diabetes medication. Rare allergy in people reactive to other Apiaceae plants (celery, fennel, carrot).
    Full Caraway (with peppermint) profile

  5. Fennel seed

    Moderate evidenceFoeniculum vulgare

    Fennel relaxes intestinal smooth muscle and has small but consistent trials for gas and cramping. In infant colic, a fennel seed oil emulsion eliminated colic in 65 percent of infants versus 24 percent on placebo in a 125-infant RCT, and a fennel-chamomile-lemon balm preparation showed similar effects. In adults, a combination of curcumin and fennel essential oil reduced IBS symptom severity by around 50 percent over 30 days in a 121-patient RCT, and fennel tea is widely used for post-meal gas, though adult-only fennel trials are sparse.

    Key evidence
    2003 RCT of fennel seed oil in 125 colicky infants (Alexandrovich et al.)
    Studied dose
    1–2 g crushed seed as a tea up to 3 times daily, or 100 mg fennel essential oil in a standardised capsule
    Best for
    Gas and cramping, especially after meals; also used for infant colic under guidance
    Cautions
    Fennel contains estragole, so avoid prolonged high-dose use in pregnancy and in young children beyond short courses. Mild oestrogenic activity, so avoid with hormone-sensitive cancers. May interact with ciprofloxacin by reducing its absorption.
    Full Fennel seed profile

  6. Psyllium husk

    Strong evidencePlantago ovata

    Psyllium is not a herb for flavour but it is a plant and it is the fibre with the best evidence in IBS. A 2009 RCT of 275 IBS patients found 10 g/day of psyllium improved symptom severity in 57 percent versus 35 percent on placebo after a month; bran did not help and worsened some symptoms. Because psyllium is only partly fermented, it produces far less gas than inulin or wheat bran. It normalises stool in both directions, helping both constipation-type and diarrhoea-type IBS.

    Key evidence
    2009 RCT of 275 IBS patients comparing psyllium, bran and placebo (Bijkerk et al., BMJ)
    Studied dose
    5–10 g/day of husk in at least 250 ml water, starting at 3 g and building up over 2 weeks
    Best for
    Bloating with irregular stools; IBS-C and IBS-D; a base for any other pick
    Cautions
    Take drugs at least 2 hours apart because psyllium can reduce absorption of lithium, carbamazepine, digoxin and some diabetes medication. Must be taken with plenty of water; it can cause obstruction if swallowed dry or in people with strictures or severe dysphagia.
    Full Psyllium husk profile

  7. Probiotics (Lactobacillus and Bifidobacterium strains)

    Moderate evidence

    Probiotics have many trials in IBS but the results are strain-specific and modest. A 2018 systematic review of 53 RCTs (5,545 patients) found probiotics improved global symptoms and bloating more than placebo, but could not say which strains were best. Bifidobacterium infantis 35624 reduced bloating and pain in a 362-woman RCT at 10^8 CFU/day, and a 2022 meta-analysis found multi-strain products reduced bloating with a small-to-moderate effect size. Benefits usually appear by 4 to 8 weeks or not at all.

    Key evidence
    2018 systematic review and meta-analysis of 53 RCTs (Ford et al., Alimentary Pharmacology & Therapeutics)
    Studied dose
    1–10 billion CFU/day of a strain tested in IBS trials (e.g. B. infantis 35624, L. plantarum 299v, B. lactis HN019), for an 8-week trial
    Best for
    Bloating that started after antibiotics or a gut infection; people who also have irregular stools
    Cautions
    Avoid in severe immunosuppression, central venous catheters or critical illness because of rare bloodstream infections. Some people get more gas for the first week; stop if bloating worsens after two weeks.
    Full Probiotics (Lactobacillus and Bifidobacterium strains) profile

  8. Saccharomyces boulardii

    Moderate evidence

    This probiotic yeast has its strongest evidence for antibiotic-associated and traveller's diarrhoea, where a 2015 meta-analysis of 21 RCTs found it roughly halved the risk. For bloating specifically, the evidence is thinner: a 2011 RCT of 67 IBS-D patients found it improved quality of life but not individual symptoms, and a 2012 Vietnamese trial of 100 patients reported reductions in bloating and stool frequency at 500 mg twice daily. It is worth trying when bloating follows antibiotics or an infection.

    Key evidence
    2015 meta-analysis of 21 RCTs on antibiotic-associated diarrhoea (Szajewska & Kołodziej)
    Studied dose
    250–500 mg (5–10 billion CFU) of S. boulardii CNCM I-745, 1–2 times daily, for 2–4 weeks
    Best for
    Post-antibiotic or post-infection bloating and loose stools
    Cautions
    Do not use with central venous lines, in ICU patients or in severe immunosuppression because of documented fungaemia cases. Antifungal drugs will neutralise it. Safe alongside antibiotics because it is a yeast.
    Full Saccharomyces boulardii profile

  9. Digestive enzymes (alpha-galactosidase and lactase)

    Moderate evidence

    Broad-spectrum enzyme blends have little evidence, but two specific enzymes do. Alpha-galactosidase (sold as Beano) breaks down the raffinose-family sugars in beans and cruciferous vegetables; a 2007 RCT in 24 volunteers found 300 GalU with a bean meal reduced flatulence and bloating scores significantly, and a 2013 trial in IBS patients found 600 GalU reduced post-meal gas. Lactase supplements reliably reduce symptoms in confirmed lactose intolerance. The rest of a typical enzyme capsule is mostly untested.

    Key evidence
    2007 RCT of alpha-galactosidase with a high-oligosaccharide meal (Di Stefano et al.)
    Studied dose
    300–600 GalU alpha-galactosidase with the first bite of a bean- or vegetable-heavy meal; 6,000–9,000 FCC units lactase before dairy
    Best for
    Predictable bloating after beans, lentils, cabbage or dairy
    Cautions
    Alpha-galactosidase releases galactose, so people with galactosaemia must avoid it. Do not use enzyme blends containing pancreatin without a diagnosis of pancreatic insufficiency. Some products contain papain or bromelain, which can add to bleeding risk with anticoagulants.
    Full Digestive enzymes (alpha-galactosidase and lactase) profile

  10. Chamomile

    Preliminary evidenceMatricaria chamomilla

    Chamomile is antispasmodic and mildly anti-inflammatory in the gut, but adult trials are few. The best data is in infants: a chamomile-containing herbal tea stopped colic in 57 percent versus 26 percent on placebo in a 68-infant RCT, and a fennel-chamomile-lemon balm formula reduced crying time by 85 percent in a 93-infant trial. In adults, a chamomile-pectin preparation shortened diarrhoea in a 255-patient trial, and an open-label study found chamomile extract improved IBS symptoms. Most adult use rests on this plus tradition.

    Key evidence
    1993 RCT of a chamomile herbal tea in 68 colicky infants (Weizman et al.)
    Studied dose
    1–3 g dried flower as tea, 3 times daily, or 220–500 mg of a standardised extract (1.2% apigenin)
    Best for
    Stress-related cramping and gas; gentle enough for evening use
    Cautions
    Allergy in people sensitive to ragweed and other Asteraceae. Mild additive sedation with benzodiazepines and alcohol; may potentiate warfarin at high doses via natural coumarins.
    Full Chamomile profile

How to choose

  • If you have IBS-type bloating with cramping or pain, start with enteric-coated peppermint oil for four weeks. It has the best evidence and works within days when it works.
  • If the main problem is fullness and nausea after meals rather than gas, start with ginger, and consider adding artichoke leaf if meals are fatty.
  • If bloating goes with irregular stools, constipation or alternating bowels, psyllium first. Build up slowly and give it a month before judging.
  • If bloating is predictable after beans, lentils, broccoli or dairy, alpha-galactosidase or lactase taken with the meal is cheaper and faster than anything else on this list.
  • If bloating started after antibiotics, food poisoning or a stomach bug, try Saccharomyces boulardii or a trial-tested probiotic strain for eight weeks.
  • If peppermint oil gives you heartburn, switch to the peppermint-caraway combination at a lower peppermint dose, or to fennel tea, and consider that reflux rather than IBS may be the real issue.

What to skip

Apple cider vinegar

The idea that low stomach acid causes bloating and vinegar fixes it has no trial support. The one small study on gastric emptying found vinegar slowed it, which would make fullness worse, not better.

Activated charcoal

Trials are old and contradictory; two found less flatulence, two found no effect on gas production. It binds medications taken within two hours, including the pill, which is a real downside for a doubtful upside.

Betaine HCl

It is in the library and some people swear by it, but there is one small trial showing it transiently re-acidifies the stomach in people on acid blockers, and no trial showing it reduces bloating. Do not use it with NSAIDs, steroids or any history of ulcer.

Detox teas and senna-based 'debloat' blends

They work by causing diarrhoea. The flat stomach is water and stool loss, not reduced gas, and regular senna use causes dependence and electrolyte problems.

Safety and when to see a clinician

  • See a clinician first if bloating is new and persistent (more than three weeks), especially over 50, or comes with weight loss, blood in the stool, black stools, vomiting, fever, difficulty swallowing, night sweats or anaemia.
  • Women with persistent bloating, pelvic pain, feeling full quickly or needing to urinate more often should be assessed for ovarian causes; these symptoms are easy to dismiss as digestive.
  • Get tested for coeliac disease before going gluten-free; a blood test only works while you are still eating gluten. Also consider lactose intolerance, SIBO and giardia if bloating follows travel.
  • Drug interactions: peppermint oil can raise cyclosporine levels; psyllium reduces absorption of lithium, digoxin, carbamazepine and some diabetes drugs (separate by 2 hours); ginger adds to bleeding risk with warfarin and clopidogrel; fennel reduces ciprofloxacin absorption.
  • Pregnancy: ginger up to 1 g/day and psyllium are considered safe. Avoid medicinal doses of fennel, caraway and peppermint oil capsules; peppermint tea is fine.
  • Probiotics and S. boulardii should be avoided by anyone with a central line, severe immune suppression or acute pancreatitis.

What matters as much as any herb

  • A low-FODMAP diet for 4–6 weeks, then reintroduction, improves symptoms in 50–75 percent of IBS patients in RCTs and beats any single herb. Work with a dietitian; it is not meant to be permanent.
  • Eat slower and stop at 80 percent full. Swallowed air and large meals are the two commonest causes of post-meal bloating and neither responds to supplements.
  • A 10–15 minute walk after meals speeds gastric emptying and transit; a 2008 trial found it moved food through the stomach faster than coffee or a digestif.
  • Reduce sugar alcohols (sorbitol, xylitol, mannitol in gum and 'sugar-free' foods) and carbonated drinks; both are frequent and overlooked triggers.
  • Sleep and stress matter: the gut-brain axis means poor sleep increases visceral sensitivity. Gut-directed hypnotherapy and CBT have response rates around 50–70 percent in IBS trials.

Frequently asked questions

What is the best herb for bloating?

Enteric-coated peppermint oil has the most evidence. Meta-analyses of randomised trials in IBS show it roughly doubles the chance of overall symptom improvement versus placebo, with bloating and cramping responding best. Take 180–225 mg two to three times daily before meals and judge after four weeks.

Does ginger help with bloating?

Ginger helps most when bloating is really fullness and nausea from slow stomach emptying. Trials show 1.2 g speeds gastric emptying by about 25 percent. It is less useful for gas lower in the gut, where peppermint, fennel or caraway fit better.

What tea is good for digestion and bloating?

Peppermint, fennel, ginger and chamomile tea all have some trial or traditional support, and tea is a reasonable way to take them for mild symptoms. For IBS-level bloating, though, tea does not deliver the dose used in trials; enteric-coated capsules of peppermint oil do.

How long do digestive herbs take to work?

Peppermint oil, ginger and enzymes act within hours to days. Artichoke, psyllium and probiotics need four to eight weeks. If nothing has changed after eight weeks, stop and reconsider the diagnosis rather than adding more supplements.

Can probiotics make bloating worse?

Yes, temporarily. Around one in five people get more gas in the first week as the gut adjusts. If it has not settled by week two, stop. Some people with SIBO or histamine intolerance feel consistently worse on Lactobacillus products.

Are digestive enzymes worth taking?

Only the specific ones for a specific trigger. Alpha-galactosidase for beans and cruciferous vegetables and lactase for dairy both have trial support. Broad 'full-spectrum' enzyme blends have almost no evidence in people with normal pancreatic function.

When should I see a doctor about bloating?

If it is persistent for more than three weeks, new after age 50, or comes with weight loss, bleeding, vomiting, fever, difficulty swallowing or anaemia. Women with ongoing bloating, early fullness and pelvic pain should be assessed for ovarian causes. You can ask AskMN to help you prepare questions for the appointment.

References

  1. Alammar N, Wang L, Saberi B, et al.. Peppermint oil for the treatment of irritable bowel syndrome: a systematic review and meta-analysis. BMC Complementary and Alternative Medicine (2019)View source
  2. Bijkerk CJ, de Wit NJ, Muris JW, et al.. Soluble or insoluble fibre in irritable bowel syndrome in primary care? Randomised placebo controlled trial. BMJ (2009)View source
  3. Holtmann G, Adam B, Haag S, et al.. Efficacy of artichoke leaf extract in the treatment of patients with functional dyspepsia: a six-week placebo-controlled, double-blind, multicentre trial. Alimentary Pharmacology & Therapeutics (2003)View source
  4. Wu KL, Rayner CK, Chuah SK, et al.. Effects of ginger on gastric emptying and motility in healthy humans. European Journal of Gastroenterology & Hepatology (2008)View source
  5. May B, Köhler S, Schneider B. Efficacy of a fixed peppermint oil/caraway oil combination in non-ulcer dyspepsia. Alimentary Pharmacology & Therapeutics (2000)View source
  6. Ford AC, Harris LA, Lacy BE, Quigley EMM, Moayyedi P. Systematic review with meta-analysis: the efficacy of prebiotics, probiotics, synbiotics and antibiotics in irritable bowel syndrome. Alimentary Pharmacology & Therapeutics (2018)View source
  7. Alexandrovich I, Rakovitskaya O, Kolmo E, Sidorova T, Shushunov S. The effect of fennel (Foeniculum vulgare) seed oil emulsion in infantile colic: a randomized, placebo-controlled study. Alternative Therapies in Health and Medicine (2003)View source
  8. Szajewska H, Kołodziej M. Systematic review with meta-analysis: Saccharomyces boulardii in the prevention of antibiotic-associated diarrhoea. Alimentary Pharmacology & Therapeutics (2015)View source
  9. Di Stefano M, Miceli E, Gotti S, et al.. The effect of oral alpha-galactosidase on intestinal gas production and gas-related symptoms. Digestive Diseases and Sciences (2007)View source
  10. Peppermint Oil: Usefulness and Safety. National Center for Complementary and Integrative Health (2020)View source
  11. Irritable bowel syndrome: diagnosis and management (CG61). NHS / NICE guidance summaryView source

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This guide is educational and is not medical advice. Herbs and supplements can interact with prescription medicines and are not regulated like drugs. Talk with a clinician or pharmacist before starting anything new, especially if you are pregnant, breastfeeding, have a chronic condition, or take medication.