Does L-glutamine Help To Increases Growth Hormone Secretion?

HI, My daughter is 5 0 . My husband is 6 0 and I am 5 5 . My daughter is 12.5 years and started her period 1 year ago at 11.5 years. I was surprised as she is a competitive swimmer who swims 2.0 hours a day for 4-5 times a week. I was very athletic and started my period at 13.5-14 years. We have read articles saying that after your period, you don t grow that much. She eats very well and gets adequate sleep (9-10 hrs a night). I recently read about l-glutamine and how it can help to increase your growth hormone levels. Can you give me any information about this and anything else she can do to maximize her growth? Thank you.