I don't use it with other supplements as she doesn't have any but I can't see why you shouldn't be able to. I don't think it smells much at all to be honest, can't say I've noticed it anyway!
The first week was pretty expensive! I used a small tub (£20) in 7 days :eek: but after that it wasn't too bad. It says to feed it per feed but I think if you just fed it once a day it would be OK. I was able to gradually reduce the amount she had and now she only really gets it before an exciting occasion.
Hope that helps :)