I read about Black Seed Oil and thought I'd give it a go as no amount of vitamins had helped. I was pleasantly surprised at not only is it helping with energy levels, but my fingernails haven't been this strong in over 30 years! The only downfall is the bitter taste which is hard to swallow, but am getting used to it. I've weened myself off the honey that I mixed it with and am able to take it 'straight' now, it just takes time to adjust to the bitterness. I will be continuing on it as I am hoping that it helps with my hair also.