l-glutamine: Glutamine is a conditionally essential amino acid. It is synthesised from glutamic acid and ammonia. It is the principal carrier of nitrogen in the body and is an important energy source for many cells. Like many other amino acids, it exists in two different forms. These are L-glutamine and D-glutamine. They are almost identical but have a slightly different molecular arrangement. While L-glutamine is used to make proteins and perform many other functions in the body, D-glutamine does not appear to play an important role in living organisms.
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