Shea Moisture Jamaican Black Castor Oil Smoothie Moisturize and define big, bouncy natural curls, or smooth chemically processed and heat styled hair with this rich, emollient styling smoothie. Nutritive Jamaican Black Castor Oil and certified organic Shea Butter blend in a strengthening formula that restores healthy moisture to damaged, brittle hair while defining curls and reducing frizz. Peppermint Oil invigorates the scalp for a stimulating experience.