I used Strata XRT during radiotherapy and it was amazing. You only need a very small amount and I was advised that using more actually made it less effective so be sparing. I didn't do under my arm or on my back for the first 3 weeks because I wasn't sure where it all ended and i just used moogoo on that area and the difference was marked. I got a lot redder and irritated where I didn't use the XRT cream. It is expensive but it absolutely was worth it for me.