l carnitine for insulin resistance L-Carnitine Is Involved in Hyperbaric Oxygen-Mediated Therapeutic Effects in High Fat Diet-Induced Lipid Metabolism Dysfunction L-Carnitine Injections for Weight Loss
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(172) found a significant positive association between serum Se levels and seminal plasma testosterone levels

Obes Rev

Consequently, prolonged use of pivalic acid-containing antibiotics, including pivampicillin, pivmecillinam, pivcephalexin, and cefditoren pivoxil (Spectracef), can lead to secondary L-carnitine deficiency (135)

(PubMed) Kumaran S, Subathra M, Balu M, Panneerselvam C