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For example, glutamine competition between glutamine-addicted breast cancer cells and anti-tumor T lymphocytes impairs T cell activity and targeting GLS in tumor cells reduced tumor growth and metastasis and improved T cell activation [49, 84]

Incidence of community-acquired pneumonia in urban China: a national population-based study

Also it's worth noting that if you have blood work conducted and it returns as falling within "the normal range" then know that "normal" does not equal optimal and therefore, if you do suffer any of the symptoms noted above with "normal levels" then you may well benefit from the extra boost

Some are easy to dismiss

This estrogen loss is especially observed when women approach peri- and postmenopause [9] and has a profound impact on dermal health and affects almost all organ systems, which has an overall negative influence on womens quality of life (QOL) [10]