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Acromegaly, a condition of chronic, often decades-long, pathological GH/IGF-1 excess from a pituitary tumor, is the closest real-world model for what sustained supraphysiological IGF-1 actually does to cancer incidence over time
In theory, this could support tumor vascularization
Eight weeks of oral L-Carnitine supplementation reverses these mitochondrial abnormalities, increases tissue efflux and urinary excretion of acetylcarnitine, and improves whole-body glucose tolerance without changes in body weight
however, clinical trials have not consistently supported these uses