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Not medical advice
gastrocrom is an oral form of cromalyn sodium, which better known as an
asthma mediaction. It prevents one of the common allergy cells ( mast
cells) from releasing its packet of nasty chemicals in response to some
allergen.  Once an allergic response has happened it doesnot stop it.
The oral form Gastrocrom is used by some to reduce food allergies.  There
is very little research to  prove that it is effective in this way. It
certainly has no role in treating celiac disease as the mechanism for the
damage of celiac disease is not blocked by this agent.
Joe Murray