Aunt Jackie's Butter Fusions Tress Boost. Aunt Jackie’s revitalizing blackberry & castor recipe is power-packed with nutrients that promote healthy hair growth. The vitamins in blackberry help in the generation of collagen, which is essential for stronger, healthier hair. Jamaican black castor oil is enriched with vitamin E, minerals, proteins, and fatty acids that trap moisture, smooths cuticles, and helps reduce hair fall.