To baddone - if i were you i wouldn't use "weight-gainer" products. They don't contain any good fat, they have protein-but usually it's of low quality, and they're filled with sugar. Why would you want to drink a ton of sugar? Make your own shakes, buy a good quality pure protein product, and combine it in a blender with good fats (flax oil, nut butter, etc.), and for carbs use fruit. This is better and healthier.
To nspeth - Green Magma uses maltodextrin as a filler. Tell your friend to switch to another greens product that doesn't contain fillers.