I tend to suffer from fatigue and fogginess and I thought Quick Study would be a good buy. However, this scent gave both my mom and I splitting headaches and we had to air out the house. It smells too strong of something and it NOT well balanced at all. In a way it stings the senses a bit and just is not a very pleasant scent. I am not sure what to do with my near full bottle of Quick Study as I definitely cannot use it again in the house.