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The ancient Egyptians used castor oil to promote hair growth, so the idea of a hot oil treatment with this natural oil is far older than retro-chic. Castor oil's moisturizing problems recommend it as a multipurpose beauty aid, meaning every girl should keep a bottle in her cupboard for home spa nights. This oil plumps up hair follicles and seals moisture in hair. It also deep conditions dry, thin or damaged hair. If your hair is over-processed or naturally fine, use castor oil to plump up the volume of those locks.