Cantharidine hair oil is product from bengal chemicals which is most popular company so ever.this is very effective hair oil to promote hair growth .this oil contains active cantharidine which nourishes to follicles to inhancing proper growth of hair and also cantains pure arachis oil which is a well known sourse of vitamin E . I have been using cantharidine hair oil about a month to prevent graying of hair. And its effectiveness seen within just 2 weeks and now my hair turning black.it is one of the best oil to promote hair growth it is not sticky and easy to use.