If he's going to be going through chemo, look into AHCC.  (Amazon.com sells it)   It's an immune booster that's been said to help chemo patients.  It's said to bring the white cell count up faster between chemo sessions.   I take it because I take a med that lowers my immune system and I've walked through a house full of flu and either haven't come down with it or had very light symptoms. 

...... Kendra