Every credible study I've seen with glutamine has shown the gains in lean mass are intestinal gains, not skeletal muscle. Intestines are a muscle (a smooth muscle), and they are lean, so of course supplement companies will use this to their marketing advantage.
Now, your intestines play a vital role in your immune system, so if you succumb easy to disease and sickness, its a worthy supplement to take. However, if you do not get sick easy, I wouldn't waste money on it.
Studies that shown it to promote gains in skeletal muscle have used glutamine via an IV drip and are generally done on bed ridden patients to prevent muscle wasting.
Now, creatine is beneficial supplement, and its effectiveness has been proven beyond any doubt.
In terms of amino's raising levels of growth hormone. Doing a set of squats to failure, or a 30 second sprint to failure will raise plasma growth hormone levels significantly higher (2-3 fold) than will be seen from ingestion of any amino acid on an empty stomach.
Br
__________________ Nimirum insanus paucis videatur, eo quod Maxima pars hominum morbo jactatur eodem.
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