l carnitine deficiency island Primary in the Faroe Islands: health and cardiac status in 76 adult patients diagnosed by screening | Journal of Inherited Metabolic Disease Carnitine Deficiency: What You Need
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2013;2(6):e000542

It is synthesized in the body from amino acids, particularly lysine and methionine

Diagnosis of Carnitine Deficiency in Extremely Preterm Neonates Related to Parenteral Nutrition: Two Step Newborn Screening Approach

They are also made up of different amino acids: L-carnitine is composed of lysine and methionine, while L-carnosine is composed of alanine and histidine

doi: 10.2165/00007256-200030030-00002
