IL6 and sarcopenia: Since sarcopenia is a multifactorial disease, biomarkers mainly correlated to various cellular metabolic processes and muscle health play a crucial role; for instance, those involved in inflammation are mainly C-Reactive Protein (CRP), IL-6, and TNF-α, and others linked to muscle integrity (Creatine Kinase, CK) or to oxidative stress (8-isoprostens) [82].