My 9 year old had very smelly feet all of a sudden. He would take off his shoes I could smell his feet across the room. I was making him go wash his feet every time he removed his shoes. (I do have an overly sensitive nose, but others noticed it too.)
I started to give him one home made capsule of calcium bentonite clay with a glass of water each day. Some days I used 1 capsules of charcoal. And I gave him alfalfa tablets once in a while too. Each are useful for internal deodorizing.
Within 10 days or so I realized that he can take off his shoes without clearing a room. :) I don't even notice an odor anymore.
I did the same a number of years ago for another one of my children who, at the age of 10 smelled like onions all the time, even if he hadn't eaten any. I just used the clay then.
~Mama to Many~