A composition comprising phytohaemagglutinin (PHA), and glutamine, glutamine derivates or metabolites, glutamine analogues or mixtures thereof is disclosed. Also, a food and feed supply and a pharmaceutical composition are disclosed. Such compositions may be used for prevention, treatment and alleviation of immature GIT, or renal failure. Also contemplated are methods for obtaining mature GIT by administration of above compositions, and a method for treatment, prevention and alleviation of renal failure.
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