What Reiki do

1- Removes depression ( Quality Life )
2- Balance metabolism (digestion, sleep etc)
3- Boosts stamina
4- Makes look young by refreshing the Skin
5- Help to improve Memory, focus, and creativity 
    (students/career tool)
6- Post surgery speed healing
8- Heals emotional trauma (divorce, loss of dear ones or finance)
9- Harmonies mutual family relationships /family
10-Improved intuitive ability /decision making

and what ever you intend in positive manner is there.

Reiki works well when There is 

1-Awareness and trust in this wisdom 
2-Trust in the Healer
4-Patience to let it work in case of healings for deep rooted
     illness or emotional traumas like cancer / paralysis  for a
     longer period of time.