This article points to a supplement that may prevent chemo brain. Several things-

1) This study points to n-acetyl cysteine as a preventative before chemotherapy- not to heal chemo brain after chemo therapy (though i supplement with it in hopes of regaining my full brain function )

2)A researcher is quoted in the article saying that chemo brain is experienced for up to two years- I have experienced this side effect for at least 10 years-yes, my chemo brain improved but I still suffer deficits-