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[38] The results of a recent study regarding L-carnitine supplementation for the management of fatigue in patients with hypothyroidism found that L-carnitine may be useful in alleviating fatigue symptoms in hypothyroid patients, especially in those younger than 50 and those who have hypothyroidism due to a thyroidectomy
Zeng F, Lai M, Li Q, Zhang H, Chen Z, Gong S, Liu X, Liu B (2023) Anti-oxidative and anti-aging effects of mannoprotein-rich yeast cell wall enzymatic hydrolysate by modulating gut microbiota and metabolites in Caenorhabditis elegans
The slow intravenous infusion protocols used in clinical trials minimized these effects, suggesting that rapid bolus administration (which is essentially what subcutaneous injection creates) may increase the likelihood of transient side effects