Is castor oil good for eyelashes? It’s one of the uses of Castor Serum. Enjoy bold brows and luscious lashes with this volumizing treatment. We took our much-loved cold-pressed Organic Castor Oil and boosted its power so you enjoy bold castor oil lashes! Our new Hair Complex targets lashes & brows while you sleep for nourishing results to take your look to new lengths. Includes a dual end brush for brow and lash application. Dermatologically & Ophthalmology Tested.