Thanks everyone for your replies.

I tried Dr's recommendation and he wouldn't take it so I mixed flaxseed oil with psyllium husk powder and apple sauce, voila, he gulped it down pretty well. All I am not too sure is, if such combination good enough as Psyllium husk is a colon broom so will it adsorb oils and prevent body from using it?

@ Lara,
Brainwise seems to have discontinued the product I used to use. I don't find it anywhere.
Thanks for Coromega link. I will look into it. He just drinks plain milk. He used to love smoothie but now he doesn't even look at it. As he is getting older, its getting tougher and tougher to feed him good food (crap food like chips, no problem at all !!)