
Alder Buckthorn Bark
A Strong clinical evidenceFrangula alnus
Frangula bark is a stimulant laxative for short-term relief of occasional constipation. Use for 1 week at most; not under 12 or in pregnancy.
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Herbs traditionally used or studied for indigestion, gas, bloating and constipation. Each herb lists its evidence level and safety warnings.
51 herbs · 12 with clinical evidence (A/B) · 18 not marked avoid in pregnancy

Frangula alnus
Frangula bark is a stimulant laxative for short-term relief of occasional constipation. Use for 1 week at most; not under 12 or in pregnancy.

Ricinus communis
A strong, fast-acting laxative with well-known efficacy for short-term constipation. Do not use it on your own to start labour.


Zingiber officinale
Powdered ginger root taken before travel may help prevent motion-sickness nausea; it is also traditionally used for mild indigestion.

Mentha × piperita
Gastro-resistant peppermint oil capsules may ease IBS cramps, wind and pain; oil rubbed on the forehead may ease mild tension headache.

Plantago ovata
Taken with plenty of water, psyllium husk helps soften stools in constipation; keep a gap between it and other medicines.

Senna alexandrina
A stimulant laxative for short-term relief of occasional constipation. No longer than 1 week; not for children under 12, in pregnancy or while breastfeeding.

Hypericum perforatum
St John's wort extract may help with mild to moderate depressive episodes, but it seriously interacts with many medicines, including the pill.

Momordica charantia
A folk remedy of bitter melon steeped in olive oil. Small studies saw a modest fall in blood sugar; it has not been shown to heal ulcers.

Piper nigrum
The world's most widely used spice. Its piperine markedly increases the absorption of some compounds, such as curcumin from turmeric.

Cuminum cyminum
An essential spice for meatballs and pulses. Small clinical studies saw mild benefit for bloating, IBS symptoms and weight control.

Rhus coriaria
A sour, red spice. Small clinical studies reported modest improvements in blood sugar and cholesterol in type 2 diabetes.


Pimpinella anisum
Aniseed tea is traditionally used for mild digestive complaints such as bloating and wind, and for cough that comes with a cold.

Cynara cardunculus (syn. C. scolymus)
Artichoke leaf is traditionally used for indigestion with fullness, bloating and wind; it must not be used with gallbladder disease.

Ocimum basilicum
An aromatic culinary herb. Traditionally used for indigestion and wind; calming effects have only been seen in animal studies.

Laurus nobilis
A Mediterranean herb that flavours food. Traditionally used for indigestion and wind; effects on blood sugar come only from small early studies.

Rhamnus cathartica
Anthraquinone-containing fruits with a very strong laxative effect. Used only short term and at low doses for occasional constipation.

Capsicum annuum, Piper nigrum, Allium sativum
A Louisiana-style blend of cayenne, black pepper, garlic, onion and thyme. It flavours food; any health effect comes from its spices.

Elettaria cardamomum
A ginger-family spice that flavours coffee and desserts. Traditionally used for indigestion and wind; other effects come from small early studies.

Centaurium erythraea
Centaury herb tea is traditionally used for mild indigestion and temporary loss of appetite; do not confuse it with St John's wort.

Matricaria recutita
A gentle herbal tea traditionally used for bloating and mild stomach cramps, common cold symptoms and mouth or throat irritation.

Terminalia chebula
A component of the Ayurvedic Triphala blend. Traditionally used as a mild laxative and, at low doses, as an astringent; clinical data are limited.
