Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Glutamine is one of the supplements that actually does something, and ON makes high-quality products

Glutamine is the most abundant single amino acid in your body. It plays a key role in muscle growth, and I can't stress its importance enough. Research has shown that lifting weights increases your body's need for glutamine, and if you don't provide enough, it will steal it from skeletal muscle tissue. Supplementing glutamine has also been shown to increase growth hormone levels.Bottom line: This is a supplement that you should always be taking, and ON makes high-quality products. I've tried cheaper glutamine powders and while I can't with certainty say that ON's is "better" (how do you quantify that, really?), I did notice that ON's mixes better with water and is less chunky. That may or may not have anything to do with quality, but I stick with ON because I know they make good stuff.