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Hi,
 
I've had good experience with "UltraClear Sustain" by Metagenics,
which is a powdered rice-based beverage.  It's designed
for the "intestinally challenged."  The label claims
it's gluten-free and has no animal products.  It has
a bunch of minerals: calcium, etc.  I actually enjoy the
taste, and have come to rely on it--but I'm wondering
whether this might be problematic.  Also: it's fairly expensive.
 
My gastro-enterologist took a cursory look at the
description and said it looked like a good product.
But he was, in doctor-fashion, pressed for time.
Does anybody know of any nutritional reasons why
this Sustain beverage might be contra-indicated
(as a regular dietary supplement)?
 
Thanks,
Dave Tanzer
NYU Computer Science