daily amount of l-carnitine | Linus Pauling Institute Thorne Research L-Carnitine | L-Carnitine

Individuals with defective carnitine transport have poor intestinal absorption of dietary L-carnitine, impaired L-carnitine reabsorption by the kidneys (i.e., increased urinary loss of L-carnitine), and defective L-carnitine uptake by muscles (4)

In: Rakel RE, Bope ET, eds

Role of free L-carnitine and acetyl-L-carnitine in post-gonadal maturation of mammalian spermatozoa

the D-isomer may actually compete with L-carnitine for absorption and transport, thereby increasing the risk of L-carnitine deficiency (4)

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At present, there is no test that assesses functional carnitine deficiency in humans (6)