Native to the Mediterranean, anise is an herb related to carrot and parsnip. Anise is used as a flavouring for food and alcohol with a taste similar to liquorice. The seeds of this herb are commonly used to treat indigestion and relieve nausea. It's a mild diuretic, meaning it will release stored fluids from the body. Anise is also an expectorant, thinning mucus and improving conditions such as bronchitis, the common cold and asthma, according to Herbal Supplement Resource. Anise, used incorrectly or at too high a dose, can have negative side effects.
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Even though anise is used in the treatment of nausea, large doses can lead to severe nausea and vomiting, especially when ingesting anise oil as opposed to drinking an infusion, or tea, made out of anise seeds.
Taken in high doses, anise can damage the nerves and nerve tissue. This is called a neurotoxic effect, according to MedicineNet. Difficulty thinking, poor emotional control and headaches are symptoms of a neurotoxic effect.
Anise contains anethole, which is a plant hormone similar to oestrogen. Frequent doses of anise can raise levels of oestrogen. It is recommended that pregnant women and children avoid ingesting anise in any form. High oestrogen levels can also lead to headaches.
Used externally, anise oil can treat mild acne and is an antioxidant. Pure anise oil can cause skin irritation, such as rashes. It will also cause photosensitivity, or a sun allergy. Photosensitivity can cause rashes or skin discolouration. Anise is usually mixed with other emollients to avoid this reaction.
Pulmonary oedema is a condition in which fluid accumulates in the lungs, according to the Mayo Clinic. This condition will cause a severe shortness of breath and requires medical treatment. Ingesting as little as 1 millilitre of pure anise oil can lead to pulmonary oedema, according to Herbal Supplement. When taken internally, anise seeds are recommended, as they contain a small percentage of oil.
As with any drug or herb, allergic reaction is possible even with the minimum dose. Watch for skin rashes and a tightness in the chest. See a doctor immediately if you experience any swelling, especially of the tongue, or if you have difficulty breathing.
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