J Neural Transm 86:135146 Smeland OB, Meisingset TW, Borges K, Sonnewald U (2012) Chronic acetyl-l-carnitine alters brain energy metabolism and increases noradrenaline and serotonin content in healthy mice
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For skin goals specifically, there is no clinical evidence base supporting injectable as superior
L-carnitine is not directly associated with weight loss however, scientifically it reduces fat mass, enhances muscle mass, reduces fatigue, and encourages fat-burning processes that contribute to fat loss