NOW Foods Sports Nutrition, L-Glutamine Pure Powder, Nitrogen Transporter*, Amino Acid, 1-PoundAbout this item NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics. NITROGEN TRANSPORTER*: Pure Glutamine Powder helps to maintain a positive nitrogen balance, aids in offsetting some of the stress from physical exertion, and helps to regulate the body's pH to support homeostasis, which is critical for overall fitness* IMMUNE SUPPORT*: Great for pre and post workout!