Reiki is so much more than just promoting health and cure sickness. Reiki is a tool that can be used for pretty much everything. It makes you think more clear and drastically increase your creativity. It strengthens your self-esteem and give you higher intuition.
If you have a tough meeting or a school test ahead of you, you can send Reiki to the situation that is about to come to make the best out of it. Reiki can also be sent to our future if we know we will need it extra much a specific day, or to our past (in this life or in earlier) to deal with old unhealed experiences.
I myself use Reiki to everything, to heal my food and water and cleansing the energies in my house.