While glutamine is a usable fuel source for cancer cells, it seems the benefits it provides during chemo are well worth taking it. It also seems glutamine reduction is a bit of a lost cause, as apparently there is always a strong glutamine blood count in the body? Not an easy one to figure out and also cancer type dependant. More research needed. [Glutamine for Amelioration of Radiation and Chemotherapy Associated Mucositis during Cancer Therapy - PMC](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7352314/)