L-glutamine is an essential amino acid required by all mammalian and insect cells grown in culture. It functions as an additional source of carbon and energy and in particular is utilized for nucleic acid synthesis. L-glutamine is extremely sensitive to pH and temperature. L-glutamine degrades relatively rapidly in stock solutions or liquid media. TCL012 is sterile filtered L-glutamine solution prepared in 0.85% normal saline. L-glutamine is an essential amino acid required by all mammalian and insect cells grown in culture. It functions as an additional source of carbon and energy and in particular is utilized for nucleic acid synthesis. L-glutamine is extremely sensitive to pH and temperature. L-glutamine degrades relatively rapidly in stock solutions or liquid media. Hence, we recommend addition of L-glutamine to media prior to use. TCL012 is sterile filtered L-glutamine solution prepared in 0.85% normal saline.