daily amount of l-carnitine Thorne Research | L-Carnitine Supplement Maximum L-Carnitine / Alfa Vitamins

They are all ubiquitous except -butyrobetaine hydroxylase is absent from cardiac and skeletal muscle

(PubMed) Melenovsky V, Hlavata K, Sedivy P, et al

N Engl J Med

An early cross-sectional study of 101 fertile and infertile men found that L-carnitine concentrations in semen were positively correlated with the number of sperm, the percentage of motile sperm, and the percentage of normal appearing sperm in the sample (110), suggesting that L-carnitine may play an important role in male fertility

Finally, the use of L-carnitine (10-20 mg/kg body weight given as a slow bolus injection) is approved by the US FDA to treat L-carnitine deficiency in subjects with ESRD undergoing hemodialysis (76)