Bitter
Bitter herbs are a category of herbs that both have a bitter taste and are reported to have healthful digestive properties.
Bitters stimulate the bitter receptors at the back of the tongue, which leads to the triggering of a numer of reflex actions, including the stimulation of digestive juices. [1]
Common bitter herbs include Barberry, Boneset, Chamomile, Dandelion, Gentian, Goldenseal, Hop, Horehound, Mugwort, Rue, Southernwood, Tansy, Wormwood leaves and Yarrow flowers (Achillea millefolium). [1][2]
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References:
[1] https://www.care2.com/greenliving/the-benefits-of-bitter-herbs.html
[2] https://en.wikipedia.org/wiki/Bitters