leaky gut syndrome (leakage of undigested food or other substance due to damaged intestinal wall) is more of a hypothetical thing. a lot of researches are still going on and it is believed to trigger the autoimmune reactions in the body. but yes it is safe to take the l-glutamine with rituximab. no contraindications to it as such. make sure she avoids outside food as you do not want to catch an infection which can trigger the rheumatoid arthritis. for further information consult a rheumatologist online --> <link>
is l-glutamine safe for a rheumatoid arthritis patient?