Lavender's name comes from the Latin word lavare, meaning to wash.
Lavender oil, extracted from the purple flowers of the plant, has a calming, aromatic scent and medicinal benefits. The plant is used to treat insomnia, hair loss, headaches, skin ailments, depression and anxiety. Although lavender oil is generally safe, it can cause side effects in some people.
Allergies
Skin irritation can occur when applying lavender oil topically. Serious allergic reaction is rare but can result in nausea, vomiting and headache.
Oral Administration
If taken orally, lavender oil can be poisonous, according to the National Center for Complementary and Alternative Medicine (NCCAM).
Drug Interactions
Using lavender along with sedatives may cause increased drowsiness. The herb also has the potential to intensify the effects of central nervous system depressants, according to the University of Maryland Medical Center.
Headaches
Lavender teas and extracts can cause headache and constipation for some people, according to the NCCAM.
Pregnancy
Pregnant and breastfeeding women should not use lavender, according to the University of Maryland Medical Center.
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