Before you go to bed every night use this roller ball on the bottom of feet. Roll all the way from the top of your toes to the bottom of heal of foot. What I personally noticed is that I didn't see a difference, but I just noticed my coworkers would call out sick and I would still be healthy. Every day that I stayed well was another happy day. One day I was feeling sick after returing from 3 international trips for work. My immune sytem felt down. I set an alarm on my phone and use this roller ball on my spine and wrist every hour while I was awake and also drank a glass of water every hour. The next day I felt back to normal. It felt so great to have a tool to help strenghten my immune system. 
 
Another great feature of this roller ball is that you can bring it on an airplane and it's easy to put in your purse or for travel.