Glutamine is a primarily produced in the muscles and appears to play an important part in keeping them functioning normally.  Glutamine is also used by white blood cells and contributes to normal immune system function.

One of glutamines most important tasks in the body is to nourish cells that line the intestine and stomach.

Some sources describe glutamine as brain fuel capable of stimulating mental alertness and clear thinking - it does this by passing through the blood brain barrier where it attaches to ammonia creating glutamic acid.

Glutamine is also given credit for being one of the few nutrients that boosts HGH levels which is essential for normal growth and development.  Because of its protein sparing effect glutamine is used by athletes to prevent loss of muscle tissue during intense exercise and for that reason glutamine is common in most sports supplements and meal replacements.

Protein - Amino Acids Supplements Home Page

Protein Supplements

The importance of protein supplementation is critical to any individual looking to build and maintain muscle mass. Protein has been called "the building blocks of life," and without proper protein supplementation the task of building and maintaining muscle mass is next to impossible. The biggest problem that's faced with the consumption of protein by way of whole foods is mostly convenience. I like to take my protein or meal replacement with me to the gym and mix it up after my work out to get my post work out meal. It is of vital importance to get nutrients into your blood stream as quickly as possible after your work out to optimize your size and strength gains. By using protein supplements you quickly consume and digest needed amounts of proteins to help you grow and recover from your workout.