Other than adding wonderful flavor to Indian dishes, curry leaves can be used as home remedies for the following:
Hair care
Curry leaves boiled in coconut oil till they are reduced to a blackened residue helps in retaining the natural pigmentation and also stimulating hair growth. Liberal intake of fresh curry leaves is beneficial in preventing premature graying of hair.
Diabetes
Eat 10 fresh mature curry leaves every morning for three months to prevent diabetes due to heredity factors. Another traditional remedy to control diabetes is by finely grinding enough curry leaves to make it into a small ball. Mix with yogurt and take it the first thing in the morning.
Constipation
Curry leaves strengthen the functions of stomach and promote its action. To help in constipation, soak curry leaves in hot water for a few hours and drink the water with a spoonful of honey added to it.
Morning sickness
One or two teaspoons of juice of curry leaves mixed with a teaspoon of lime juice and 1 teaspoon sugar may be taken. The curry leaves, ground to a fine paste and mixed with buttermilk, can also be taken on an empty stomach in case of stomach upsets. Plain curry leaf tea also helps to cure nausea.
Diarrhea
Tender curry leaves are useful in diarrhea and piles. They can be taken, mixed with honey. Alternatively you can also chew on fresh curry leaves.
Source:http://healthy-lifestyle.most-effective-solution.com/2007/04/29/the-curry-leaf-magic-in-the-kariveppillai/