For hair :

Castor oil allows to strengthen hair and to accelerate the hair growth.

To use : you can apply once a week massaging from root to lengths. You can melt with coconut oil or mustard to maximize the effects and decrease its viscous side. You can use like a mask all night and you wash your hair the next day. Don't hesitate to make two shampoo because castor oil is very greasy.

For eyelashes and eyebrows :

As for the hair castor oil have an strengthen effect promotes the growth of eyelashes and eyebrows.

To use : Pour a little bit on a cotton and let sit a few minutes on your cleansed eyelashes and eyebrows.

For joint pain :

Castor oil have anti-inflammatory properties.

To use : gently massage the painful area

For menstruation :

You can imbibe a laundry or a compress with castor oil which that you will place on your belly. To maximize the effects you can to place a hot water bottle on the compress. 

For headaches : 

As for the joint pain, castor oil allows to calm the headaches.

To use: Put some castor oil on your fingers and massage your buffers with circular movements.

For insomnia :

In case of temporary or repeated insomnia, castor oil can help you!

To use: imbibe a cotton with castor oil that you have heated beforehand and to place pieces of cotton in your ears.