jamaican black castor oil premium best natural pure organic strengthen grow & restore hair care 8 oz  jamaican black castor oil has crossed over into other ethnic groups, and is now being used widely for some of the same purposes, as well as new found uses including eyelash and eyebrow hair growth and as massage oil. this versatile oil carries many varied uses. </br>jamaican black castor oil works for all hair types and textures. a healthy scalp means healthy hair. it works for all hair types because the oil works on the hair roots/follicles and not the hair itself.</br> over the last ten years, it is an established precedent that jamaican black castor oil is more effective than the clear pharmacy castor oil because of the ash content due to roasting of the beans. therefore, it stands to reason that the more ash content, the more effective the oil. this is not a myth, it is evidence based on scientific facts. the scientific name for the castor bean is ricinus communis. it is organic and sulfate-free. there is nothing in it that will harm your hair.