I tried Ka'chava a couple of years ago and found it wildly overstimulating. It might be wonderful for someone who isn't ill, but obviously my body needs a carefully selected array of inputs, not the standard 'this will make you feel great' collection. I passed my very expensive bag on to my healthy and health-obsessed sister (after giving the Ka'chava a few sets of tries over a few months) and have not heard anything pro or con from her.
entire generations of older folks have been fed Ensure.
so there is bound to be something with some simple basic nutrition, which is better than ENSURE (its got corn syrup I seem to recall, not something my Mom should have been consuming but it existed at her rest home by the case.)