Both are extensively documented across published research, which is why theyre so commonly studied together
One 2019 review that included data from 55 studies observed that glutamine improved some fatigue markers, such as increased glycogen synthesis and reduced ammonia accumulation, but this intervention did not always increase physical performance

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To achieve this, nerve fibers (axons) are wrapped in a fatty, protective insulating layer known as the myelin sheath
Following this, they were washed three times with PBST (1X PBS and 0.05% Tween-20), then incubated with mouse IgG FITC conjugated secondary antibody (Invitrogen)