Common drugstore variety of 3.5% H2O2 as Brooks post said. Check the  
archives for his post on 7/6/09.
 
In a message dated 8/12/2013 4:35:56 A.M. Pacific Daylight Time,  
ptf2...@bellsouth.net writes:

Did  you use H2O2 from a drugstore or did you get the variety from a health 
food  store and dilute it down?
PT
Recommend ONLY Food Grade H2O2, unless you're into absorbing phenol,  
acetanilide, acetanilid,sodium stanate, and tetrasodium  phosphate.
Thanks but no thanks. I have yet to experience a bad  reaction to any of 
Brooks Bradleys protocols. If you can improve his protocols  go for it. 
Brickey